isslod2011 - semantic multimedia
DESCRIPTION
My lecture at the Indian-summer School on Linked Open Data 2011 at the University Leipzig (Germany) on 15. Sep 2011TRANSCRIPT
Semantic MultimediaIndian Summer School on Linked Data
Leipzig, 15 Sep. 2011
Dr. Harald SackHasso-Plattner-Institut for IT-Systems Engineering
University of Potsdam
Harald Sack, Hasso-Plattner-Institute for IT-Systems Engineering, Indian Summer School on Linked Data, Leipzig, 12-18. Sep. 2011
■ HPI was founded in October 1998 as a Public-Private-Partnership
■ HPI Research and Teaching is focussed onIT Systems Engineering
■ 10 Professors and 100 Scientific Coworkers■ 450 Bachelor / Master Students ■ HPI is winner of CHE-Ranking 2010
http://hpi.uni-potsdam.de/
Harald Sack, Hasso-Plattner-Institute for IT-Systems Engineering, Indian Summer School on Linked Data, Leipzig, 12-18. Sep. 2011
■ Research Topics□ Semantic Web Technologies□ Ontological Engineering□ Information Retrieval□ Multimedia Analysis & Retrieval□ Social Networking□ Data/Information Visualization
■ Research Projects
Semantic Technologies & Multimedia Retrieval
Harald Sack, Hasso-Plattner-Institute for IT-Systems Engineering, Indian Summer School on Linked Data, Leipzig, 12-18. Sep. 2011
Overview(1) Multimedia and Semantics(2) Multimedia Metadata and Ontologies(3) Semantic Multimedia Analysis(4) Semantic Multimedia Retrieval
Semantic MultimediaIndian Summer School on Linked Data, Leipzig, 15 Sep. 2011
Harald Sack, Hasso-Plattner-Institute for IT-Systems Engineering, Indian Summer School on Linked Data, Leipzig, 12-18. Sep. 2011
1. Multimedia and Semantics
Communication is the activity of conveying meaningful information
Harald Sack, Hasso-Plattner-Institute for IT-Systems Engineering, Indian Summer School on Linked Data, Leipzig, 12-18. Sep. 2011
Sender
Information
Encoding
Message
Receiver
Information
Decoding
Message
Channel
1. Multimedia and Semantics
Claude E. Shannon: ,A mathematical theory of communication‘, Bell System Technical Journal, vol. 27, pp. 379–423, 623-656, July, October, 1948
Shannon‘s Model of Communication
Claude E. Shannon(1916-2001)
Harald Sack, Hasso-Plattner-Institute for IT-Systems Engineering, Indian Summer School on Linked Data, Leipzig, 12-18. Sep. 2011
Sender
Information
Encoding
Message
Receiver
Information
Decoding
Message
Channel
1. Multimedia and Semantics
Claude E. Shannon: ,A mathematical theory of communication‘, Bell System Technical Journal, vol. 27, pp. 379–423, 623-656, July, October, 1948
Shannon‘s Model of Communication
Claude E. Shannon(1916-2001)
Media
Sender
Information
Encoding
Receiver
Information
Decoding
Harald Sack, Hasso-Plattner-Institute for IT-Systems Engineering, Indian Summer School on Linked Data, Leipzig, 12-18. Sep. 2011
Message Message
Channel
1. Multimedia and Semantics
Media
Harald Sack, Hasso-Plattner-Institute for IT-Systems Engineering, Indian Summer School on Linked Data, Leipzig, 12-18. Sep. 2011
Message Message
Channel
1. Multimedia and Semantics
Media
MEDIA: In communications, media (singular medium) are the storage and transmission channels or tools used to store and deliver information or data.
Harald Sack, Hasso-Plattner-Institute for IT-Systems Engineering, Indian Summer School on Linked Data, Leipzig, 12-18. Sep. 2011
Harald Sack, Hasso-Plattner-Institute for IT-Systems Engineering, Indian Summer School on Linked Data, Leipzig, 12-18. Sep. 2011
TEXT: In literary theory, a text is a coherent set of symbols that transmits some kind of informative message.
Harald Sack, Hasso-Plattner-Institute for IT-Systems Engineering, Indian Summer School on Linked Data, Leipzig, 12-18. Sep. 2011
TEXT: In literary theory, a text is a coherent set of symbols that transmits some kind of informative message.
Harald Sack, Hasso-Plattner-Institute for IT-Systems Engineering, Indian Summer School on Linked Data, Leipzig, 12-18. Sep. 2011
TEXT: In literary theory, a text is a coherent set of symbols that transmits some kind of informative message.
Text
Harald Sack, Hasso-Plattner-Institute for IT-Systems Engineering, Indian Summer School on Linked Data, Leipzig, 12-18. Sep. 2011
TEXT: In literary theory, a text is a coherent set of symbols that transmits some kind of informative message. Images
Text
Harald Sack, Hasso-Plattner-Institute for IT-Systems Engineering, Indian Summer School on Linked Data, Leipzig, 12-18. Sep. 2011
Harald Sack, Hasso-Plattner-Institute for IT-Systems Engineering, Indian Summer School on Linked Data, Leipzig, 12-18. Sep. 2011
Text
Harald Sack, Hasso-Plattner-Institute for IT-Systems Engineering, Indian Summer School on Linked Data, Leipzig, 12-18. Sep. 2011
Image
Text
Harald Sack, Hasso-Plattner-Institute for IT-Systems Engineering, Indian Summer School on Linked Data, Leipzig, 12-18. Sep. 2011
Video / Audio
Image
Text
Harald Sack, Hasso-Plattner-Institute for IT-Systems Engineering, Indian Summer School on Linked Data, Leipzig, 12-18. Sep. 2011
Video / Audio
Image
Text
InteractiveElements
Harald Sack, Hasso-Plattner-Institute for IT-Systems Engineering, Indian Summer School on Linked Data, Leipzig, 12-18. Sep. 2011
1. Multimedia and Semantics
Media
Harald Sack, Hasso-Plattner-Institute for IT-Systems Engineering, Indian Summer School on Linked Data, Leipzig, 12-18. Sep. 2011
1. Multimedia and Semantics
Media
time-independent
text
image
Harald Sack, Hasso-Plattner-Institute for IT-Systems Engineering, Indian Summer School on Linked Data, Leipzig, 12-18. Sep. 2011
1. Multimedia and Semantics
Media
time-dependent
audio
video / animation
time-independent
text
image
Harald Sack, Hasso-Plattner-Institute for IT-Systems Engineering, Indian Summer School on Linked Data, Leipzig, 12-18. Sep. 2011
1. Multimedia and Semantics
One Small Step ...This video shows Neil Armstrong climbing down the lunar module ladder to the lunar surface. The video compares existing footage with the partially restored video. The thumbnail image shows the new footage on the left and the old on the right.
• Information is encoded in media content• Media content contains implicite semantics
Harald Sack, Hasso-Plattner-Institute for IT-Systems Engineering, Indian Summer School on Linked Data, Leipzig, 12-18. Sep. 2011
1. Multimedia and Semantics
One Small Step ...This video shows Neil Armstrong climbing down the lunar module ladder to the lunar surface. The video compares existing footage with the partially restored video. The thumbnail image shows the new footage on the left and the old on the right.
• Information is encoded in media content• Media content contains implicite semantics
Harald Sack, Hasso-Plattner-Institute for IT-Systems Engineering, Indian Summer School on Linked Data, Leipzig, 12-18. Sep. 2011
1. Multimedia and Semantics
One Small Step ...This video shows Neil Armstrong climbing down the lunar module ladder to the lunar surface. The video compares existing footage with the partially restored video. The thumbnail image shows the new footage on the left and the old on the right.
• Information is encoded in media content• Media content contains implicite semantics
Harald Sack, Hasso-Plattner-Institute for IT-Systems Engineering, Indian Summer School on Linked Data, Leipzig, 12-18. Sep. 2011
SEMANTIC MULTIMEDIA facilitates • explicite semantic annotation • of multimedia content • on different levels of abstraction w.r.t.
• time, • space, and • provenance.
Harald Sack, Hasso-Plattner-Institute for IT-Systems Engineering, Indian Summer School on Linked Data, Leipzig, 12-18. Sep. 2011
1. Multimedia and Semantics
One Small Step ...This video shows Neil Armstrong climbing down the lunar module ladder to the lunar surface. The video compares existing footage with the partially restored video. The thumbnail image shows the new footage on the left and the old on the right.
dbpedia:Neil_Armstrong
Text
(1)Identify media fragment(2)Annotate with explicite semantics
Harald Sack, Hasso-Plattner-Institute for IT-Systems Engineering, Indian Summer School on Linked Data, Leipzig, 12-18. Sep. 2011
1. Multimedia and Semantics
One Small Step ...This video shows Neil Armstrong climbing down the lunar module ladder to the lunar surface. The video compares existing footage with the partially restored video. The thumbnail image shows the new footage on the left and the old on the right.
dbpedia:Astronautdbpedia:Flag
Video
(1)Identify media fragment(2)Annotate with explicite semantics
Harald Sack, Hasso-Plattner-Institute for IT-Systems Engineering, Indian Summer School on Linked Data, Leipzig, 12-18. Sep. 2011
Overview(1) Multimedia and Semantics(2) Multimedia Metadata and Ontologies(3) Semantic Multimedia Analysis(4) Semantic Multimedia Retrieval
Semantic MultimediaIndian Summer School on Linked Data, Leipzig, 15 Sep. 2011
Harald Sack, Hasso-Plattner-Institute for IT-Systems Engineering, Indian Summer School on Linked Data, Leipzig, 12-18. Sep. 2011
2. Multimedia Metadata and Ontologies
One Small Step ...This video shows Neil Armstrong climbing down the lunar module ladder to the lunar surface. The video compares existing footage with the partially restored video. The thumbnail image shows the new footage on the left and the old on the right.
dbpedia:Astronautdbpedia:Flag
Video
Harald Sack, Hasso-Plattner-Institute for IT-Systems Engineering, Indian Summer School on Linked Data, Leipzig, 12-18. Sep. 2011
2. Multimedia Metadata and Ontologies
One Small Step ...This video shows Neil Armstrong climbing down the lunar module ladder to the lunar surface. The video compares existing footage with the partially restored video. The thumbnail image shows the new footage on the left and the old on the right.
dbpedia:Astronautdbpedia:Flag
Video
How can we put (semantic) metadata at the appropriate place within the media?
Harald Sack, Hasso-Plattner-Institute for IT-Systems Engineering, Indian Summer School on Linked Data, Leipzig, 12-18. Sep. 2011
2. Multimedia Metadata and Ontologies
What is ,Metadata‘?
Harald Sack, Hasso-Plattner-Institute for IT-Systems Engineering, Indian Summer School on Linked Data, Leipzig, 12-18. Sep. 2011
2. Multimedia Metadata and Ontologies
What is ,Metadata‘?„Metadata is defined as data providing information about one or more aspects of the data“ (informal Definition, Wikipedia)
Harald Sack, Hasso-Plattner-Institute for IT-Systems Engineering, Indian Summer School on Linked Data, Leipzig, 12-18. Sep. 2011
2. Multimedia Metadata and Ontologies
What is ,Metadata‘?„Metadata is defined as data providing information about one or more aspects of the data“ (informal Definition, Wikipedia)
„Metadata is structured, encoded data that describe characteristics of information-bearing entities to aid in the identification, discovery, assessment, and management of the described entities.“ (W.R. Durell, 1985)
Harald Sack, Hasso-Plattner-Institute for IT-Systems Engineering, Indian Summer School on Linked Data, Leipzig, 12-18. Sep. 2011
2. Multimedia Metadata and Ontologies
What is ,Metadata‘?„Metadata is defined as data providing information about one or more aspects of the data“ (informal Definition, Wikipedia)
„Metadata is structured, encoded data that describe characteristics of information-bearing entities to aid in the identification, discovery, assessment, and management of the described entities.“ (W.R. Durell, 1985)
„Metadata is machine understandable information about web resources or other things.“ (T.Berners-Lee, Axioms of Web Architecture: Metadata, W3C, 1997)
Metadata
Harald Sack, Hasso-Plattner-Institute for IT-Systems Engineering, Indian Summer School on Linked Data, Leipzig, 12-18. Sep. 2011
2. Multimedia Metadata and Ontologies
•Simple example: bibliographic metadata
Identification viaISBN / ISSNauthor(s)titel...
Classification viacategorieskeywordsabstract...
Structured Metadata• name-value pairs (e.g. author=‘Ernest Hemingway‘)
• typed (e.g. author is of type string)
• Meaning (semantics) of structured data is only implicite, i.e. it relies on mutual agreement about the proper usage of the data (e.g. Standardization for Dublin Core)
Harald Sack, Hasso-Plattner-Institute for IT-Systems Engineering, Indian Summer School on Linked Data, Leipzig, 12-18. Sep. 2011
2. Multimedia Metadata and Ontologies
• Title: A name given to the resource. • Creator: An entity primarily responsible for making the resource. • Subject: The topic of the resource. • Description: An account of the resource. • Publisher: An entity responsible for making the resource available. • Contributor: An entity responsible for making contributions to the
resource.....
http://dublincore.org/documents/dces/
Structured Metadata• can also be structured hierarchically
Harald Sack, Hasso-Plattner-Institute for IT-Systems Engineering, Indian Summer School on Linked Data, Leipzig, 12-18. Sep. 2011
2. Multimedia Metadata and Ontologies
Systema Naturae (1735)
Carl von Linné(1707-1787)
Structured Metadata• Classification Systems, as e.g. Dewey Decimal Classification
Harald Sack, Hasso-Plattner-Institute for IT-Systems Engineering, Indian Summer School on Linked Data, Leipzig, 12-18. Sep. 2011
2. Multimedia Metadata and Ontologies
DDC 23 (2011)• 4 volumes• >4.000 pages• >45.000 classes• >96.000 registered terms
DDC 1 (1876)• 44 pages
10 Main DDC Classes000 Computer science, information & general works100 Philosophy & psychology200 Religion300 Social sciences400 Language500 Science600 Technology700 Arts & recreation800 Literature900 History & geography
Melvil Dewey(1851-1931)
http://www.oclc.org/dewey/
Unstructured Metadata• Text based metadata without a predefined structure, where the meaning
(semantics) is determined implicitely by the (natural language) content. • e.g. abstract/summary
Harald Sack, Hasso-Plattner-Institute for IT-Systems Engineering, Indian Summer School on Linked Data, Leipzig, 12-18. Sep. 2011
2. Multimedia Metadata and Ontologies
Melville Louis Kossuth (Melvil) Dewey was an American librarian and educator, inventor of the Dewey Decimalsystem of library classification, and a founder of the Lake Placid Club.. Dewey was born in Adams Center, New York, the fifth and last child of Joel and Eliza Greene Dewey. He attended rural schools and determined early that his destiny was to be a reformer in educating the masses. At Amherst College he belonged to Delta Kappa Epsilon, earning a bachelor's degree in 1874 and a master's in 1877....
Harald Sack, Hasso-Plattner-Institute for IT-Systems Engineering, Indian Summer School on Linked Data, Leipzig, 12-18. Sep. 2011
Authoritative vs. non-authoritative Metadata
Authoritative Metadataare generated by a reliable (authoritative) source, as e.g. • the author of the original information• a certified expert
Non-authoritative Metadataare created by an unreliable source, as e.g.
• the user• Social Tagging Systems
2. Multimedia Metadata and Ontologies
Collaborative Annotation -- Social Tagging
Harald Sack, Hasso-Plattner-Institute for IT-Systems Engineering, Indian Summer School on Linked Data, Leipzig, 12-18. Sep. 2011
AuthorRessource
Users
authoritativeMetadata
apple
fruit
non-authoritativeMetadata
tasty
apple
fruit
breakfast
to buy © E.C. Publications, Inc.
2. Multimedia Metadata and Ontologies
Collaborative Annotation -- Folksonomies
Harald Sack, Hasso-Plattner-Institute for IT-Systems Engineering, Indian Summer School on Linked Data, Leipzig, 12-18. Sep. 2011
http://www.wordle.net/
2. Multimedia Metadata and Ontologies
2. Multimedia Metadata and Ontologies
Harald Sack, Hasso-Plattner-Institute for IT-Systems Engineering, Indian Summer School on Linked Data, Leipzig, 12-18. Sep. 2011
Semantic Metadata• can be structured or semi-structured metadata• the semantics of metadata is defined explicitely in a formal way (Ontologies) and
therefore machine readable (as well as machine understandable)
"An ontology is an explicit, formal specification of a shared conceptualization. The term is borrowed from philosophy, where an Ontology is a systematic account of Existence. For AI systems, what ‘exists’ is that which can be represented.“ (Thomas R. Gruber, 1993)
conceptualization: abstract model (domain, relevant terms, relations)explicit: semantics of all terms must be definedformal: machine understandableshared: consensus about ontology
Example for Semantic Metadata
Harald Sack, Hasso-Plattner-Institute for IT-Systems Engineering, Indian Summer School on Linked Data, Leipzig, 12-18. Sep. 2011
publication
2. Multimedia Metadata and Ontologies
Example for Semantic Metadata
Harald Sack, Hasso-Plattner-Institute for IT-Systems Engineering, Indian Summer School on Linked Data, Leipzig, 12-18. Sep. 2011
publication
• titel
• keywords
• ...
properties
2. Multimedia Metadata and Ontologies
Example for Semantic Metadata
Harald Sack, Hasso-Plattner-Institute for IT-Systems Engineering, Indian Summer School on Linked Data, Leipzig, 12-18. Sep. 2011
publication
book
is a
• titel
• keywords
• ...
properties
2. Multimedia Metadata and Ontologies
Example for Semantic Metadata
Harald Sack, Hasso-Plattner-Institute for IT-Systems Engineering, Indian Summer School on Linked Data, Leipzig, 12-18. Sep. 2011
publication
book
is a
journal
is a
• titel
• keywords
• ...
properties
2. Multimedia Metadata and Ontologies
Example for Semantic Metadata
Harald Sack, Hasso-Plattner-Institute for IT-Systems Engineering, Indian Summer School on Linked Data, Leipzig, 12-18. Sep. 2011
publication
book
is a
journal
is a
publisherpublishes
• titel
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properties
2. Multimedia Metadata and Ontologies
Example for Semantic Metadata
Harald Sack, Hasso-Plattner-Institute for IT-Systems Engineering, Indian Summer School on Linked Data, Leipzig, 12-18. Sep. 2011
publication
book
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journal
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publisherpublishes
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2. Multimedia Metadata and Ontologies
Example for Semantic Metadata
Harald Sack, Hasso-Plattner-Institute for IT-Systems Engineering, Indian Summer School on Linked Data, Leipzig, 12-18. Sep. 2011
publication
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2. Multimedia Metadata and Ontologies
Example for Semantic Metadata
Harald Sack, Hasso-Plattner-Institute for IT-Systems Engineering, Indian Summer School on Linked Data, Leipzig, 12-18. Sep. 2011
publication
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2. Multimedia Metadata and Ontologies
Example for Semantic Metadata
Harald Sack, Hasso-Plattner-Institute for IT-Systems Engineering, Indian Summer School on Linked Data, Leipzig, 12-18. Sep. 2011
publication
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2. Multimedia Metadata and Ontologies
Example for Semantic Metadata
Harald Sack, Hasso-Plattner-Institute for IT-Systems Engineering, Indian Summer School on Linked Data, Leipzig, 12-18. Sep. 2011
publication
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2. Multimedia Metadata and Ontologies
Example for Semantic Metadata
Harald Sack, Hasso-Plattner-Institute for IT-Systems Engineering, Indian Summer School on Linked Data, Leipzig, 12-18. Sep. 2011
publication
book
is a
journal
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2. Multimedia Metadata and Ontologies
Example for Semantic Metadata
Harald Sack, Hasso-Plattner-Institute for IT-Systems Engineering, Indian Summer School on Linked Data, Leipzig, 12-18. Sep. 2011
publication
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2. Multimedia Metadata and Ontologies
Example for Semantic Metadata
Harald Sack, Hasso-Plattner-Institute for IT-Systems Engineering, Indian Summer School on Linked Data, Leipzig, 12-18. Sep. 2011
publication
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2. Multimedia Metadata and Ontologies
Example for Semantic Metadata
Harald Sack, Hasso-Plattner-Institute for IT-Systems Engineering, Indian Summer School on Linked Data, Leipzig, 12-18. Sep. 2011
publication
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journal
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2. Multimedia Metadata and Ontologies
Example for Semantic Metadata
Harald Sack, Hasso-Plattner-Institute for IT-Systems Engineering, Indian Summer School on Linked Data, Leipzig, 12-18. Sep. 2011
publication
book
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journal
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2. Multimedia Metadata and Ontologies
Example for Semantic Metadata
Harald Sack, Hasso-Plattner-Institute for IT-Systems Engineering, Indian Summer School on Linked Data, Leipzig, 12-18. Sep. 2011
publication
book
is a
journal
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2. Multimedia Metadata and Ontologies
entity
Example for Semantic Metadata
Harald Sack, Hasso-Plattner-Institute for IT-Systems Engineering, Indian Summer School on Linked Data, Leipzig, 12-18. Sep. 2011
publication
book
is a
journal
is a
publisherpublishes
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2. Multimedia Metadata and Ontologies
entity
class
Example for Semantic Metadata
Harald Sack, Hasso-Plattner-Institute for IT-Systems Engineering, Indian Summer School on Linked Data, Leipzig, 12-18. Sep. 2011
publication
book
is a
journal
is a
publisherpublishes
• titel
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Personis a
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2. Multimedia Metadata and Ontologies
entity
class
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Example for Semantic Metadata
Harald Sack, Hasso-Plattner-Institute for IT-Systems Engineering, Indian Summer School on Linked Data, Leipzig, 12-18. Sep. 2011
publication
book
is a
journal
is a
publisherpublishes
• titel
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properties
Autorwrites
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2. Multimedia Metadata and Ontologies
entity
class
relation
axiom
2. Multimedia Metadata and Ontologies
Harald Sack, Hasso-Plattner-Institute for IT-Systems Engineering, Indian Summer School on Linked Data, Leipzig, 12-18. Sep. 2011
Semantic Metadata• enable the definition of formal Axioms
• e.g. „It is not possible that the publishing date is earlier than the birth date of the author of the publication.“
• enable deduction of new facts• e.g. „All men are mortal.“
„Socrates is a man.“ „Therefore Socrates is mortal.“
• semantic Metadata enable to make implicitely giveninformation explicite with the help of deduction andinference
Raffael: The School of Athens, 1510
Harald Sack, Hasso-Plattner-Institute for IT-Systems Engineering, Indian Summer School on Linked Data, Leipzig, 12-18. Sep. 2011
Multimedia Metadata Description Languages• for time-based media
• annotatation of temporal media fragments
2. Multimedia Metadata and Ontologies
time
Harald Sack, Hasso-Plattner-Institute for IT-Systems Engineering, Indian Summer School on Linked Data, Leipzig, 12-18. Sep. 2011
Multimedia Metadata Description Languages• for media with spatial extend
• annotatation of spatial media fragments
2. Multimedia Metadata and Ontologies
metadata
metadata
Harald Sack, Hasso-Plattner-Institute for IT-Systems Engineering, Indian Summer School on Linked Data, Leipzig, 12-18. Sep. 2011
Multimedia Metadata• MPEG-7
The MPEG-7 standard, formerly named „Multimedia Content Description Interface“, provides a rich set of standard tools to describe multimedia content. Both human users and automatic systems that process audiovisual information are within the scope of MPEG-7.
• Components of the MPEG-7 Standard• MPEG-7 Systems• MPEG-7 Description Definition Language• MPEG-7 Visual• MPEG-7 Audio• MPEG-7 Multimedia Description Schemes MDS• MPEG-7 Reference Software• MPEG-7 Conformance• MPEG-7 Extraction and Use of Descriptions
2. Multimedia Metadata and Ontologies
Harald Sack, Hasso-Plattner-Institute for IT-Systems Engineering, Indian Summer School on Linked Data, Leipzig, 12-18. Sep. 2011
MPEG-7 Description of a Video Segment <Mpeg7 xmlns="..."><Description xsi:type="ContentEntityType"> ... <Video> <TemporalDecomposition> <VideoSegment> <CreationInformation>...</CreationInformation> <TextAnnotation> <KeywordAnnotation> <Keyword>mouse</Keyword> </KeywordAnnotation> </TextAnnotation> <MediaTime> <MediaTimePoint>T00:05:05:0F25</MediaTimePoint> <MediaDuration>PT00H00M31S0N25F</MediaDuration> </MediaTime> </VideoSegment> </TemporalDecomposition> </Video> ... </Description></Mpeg7>
2. Multimedia Metadata and Ontologies
Harald Sack, Hasso-Plattner-Institute for IT-Systems Engineering, Indian Summer School on Linked Data, Leipzig, 12-18. Sep. 2011
MPEG-7 Description of a Still Image
2. Multimedia Metadata and Ontologies
Harald Sack, Hasso-Plattner-Institute for IT-Systems Engineering, Indian Summer School on Linked Data, Leipzig, 12-18. Sep. 2011
MPEG-7 and the Semantic Web• MDS Upper Layer represented in RDF(S)
(2001: Hunter, later with link to ABC upper ontology)• MDS fully represented in OWL-DL
(2004: Tsinaraki et al., DS-MIRF model)• MPEG-7 fully represented in OWL-DL
(2005: Garcia & Celma, Rhizomik model)• MDS and Visual Parts represented in OWL-DL
(2007: Arndt et al., COMM model, re-engineering of MPEG-7 with DOLCE design patterns)
2. Multimedia Metadata and Ontologies
Harald Sack, Hasso-Plattner-Institute for IT-Systems Engineering, Indian Summer School on Linked Data, Leipzig, 12-18. Sep. 2011
Example: Tagging with an MPEG-7 Ontology
2. Multimedia Metadata and Ontologies
Reg1
• Localize a region → Draw a bounding box
• Annotate the content → Interpret the content → Tag ,Astronaut‘
:Reg1 foaf:depicts dbpedia:Astronaut
Harald Sack, Hasso-Plattner-Institute for IT-Systems Engineering, Indian Summer School on Linked Data, Leipzig, 12-18. Sep. 2011
Example: Tagging with an MPEG-7 Ontology
2. Multimedia Metadata and Ontologies
Reg1
mpeg7:image
mpeg7:depicts
Man on the Moon
mpeg7:spatial_decomposition Reg1
mpeg7:StillRegion
rdf:type
mpeg7:depicts
dbpedia:Astronaut
mpeg7:SpatialMask
mpeg7:polygon
mpeg7:Coords
Harald Sack, Hasso-Plattner-Institute for IT-Systems Engineering, Indian Summer School on Linked Data, Leipzig, 12-18. Sep. 2011
Media Fragment Identification• Multimedia data has temporal and spatial dimension• pinpoint access on media fragments (on the web) with media fragment
identifiers• (W3C Media Fragments URI 1.0, Juli 2009, Working Draft)• simple examples
• requires different handling of media data by http client-server transactions
2. Multimedia Metadata and Ontologies
http://www.example.com/example.ogg#track=‘audio‘
http://www.example.com/example.ogg#track=‘audio‘&t=10s,20s
http://www.example.com/example.ogg#track=‘video‘&xywh=160,120,320,240
Harald Sack, Hasso-Plattner-Institute for IT-Systems Engineering, Indian Summer School on Linked Data, Leipzig, 12-18. Sep. 2011
Overview(1) Multimedia and Semantics(2) Multimedia Metadata and Ontologies(3) Semantic Multimedia Analysis(4) Semantic Multimedia Retrieval
Semantic MultimediaIndian Summer School on Linked Data, Leipzig, 15 Sep. 2011
Harald Sack, Hasso-Plattner-Institute for IT-Systems Engineering, Indian Summer School on Linked Data, Leipzig, 12-18. Sep. 2011
How do we find something in a Multimedia Archive?
Harald Sack, Hasso-Plattner-Institute for IT-Systems Engineering, Indian Summer School on Linked Data, Leipzig, 12-18. Sep. 2011
How does Google find a video?
Harald Sack, Hasso-Plattner-Institute for IT-Systems Engineering, Indian Summer School on Linked Data, Leipzig, 12-18. Sep. 2011
How do you find something in an audiovisual archive?
Harald Sack, Hasso-Plattner-Institute for IT-Systems Engineering, Indian Summer School on Linked Data, Leipzig, 12-18. Sep. 2011
Step 1: Digitalization of analogue data
How do you find something in an audiovisual archive?
Harald Sack, Hasso-Plattner-Institute for IT-Systems Engineering, Indian Summer School on Linked Data, Leipzig, 12-18. Sep. 2011
Step 1: Digitalization of analogue data
How do you find something in an audiovisual archive?
Step 2: Annotation with (textbased) metadata
Harald Sack, Hasso-Plattner-Institute for IT-Systems Engineering, Indian Summer School on Linked Data, Leipzig, 12-18. Sep. 2011
• Manual annotation of AV-content with descriptive metadata
How do you find something in an audiovisual archive?
Harald Sack, Hasso-Plattner-Institute for IT-Systems Engineering, Indian Summer School on Linked Data, Leipzig, 12-18. Sep. 2011
...can this also be achieved in an automated way?
Harald Sack, Hasso-Plattner-Institute for IT-Systems Engineering, Indian Summer School on Linked Data, Leipzig, 12-18. Sep. 2011
Automated AV-Media Analysis
automated content-based analysis is•difficult (error prone) and•complex
Harald Sack, Hasso-Plattner-Institute for IT-Systems Engineering, Indian Summer School on Linked Data, Leipzig, 12-18. Sep. 2011
Automated AV-Media Analysis
automated content-based analysis is•difficult (error prone) and•complex
Harald Sack, Hasso-Plattner-Institute for IT-Systems Engineering, Indian Summer School on Linked Data, Leipzig, 12-18. Sep. 2011
Automated AV-Media Analysis
automated content-based analysis is•difficult (error prone) and•complex
Harald Sack, Hasso-Plattner-Institute for IT-Systems Engineering, Indian Summer School on Linked Data, Leipzig, 12-18. Sep. 2011
Automated AV-Media Analysis
automated content-based analysis is•difficult (error prone) and•complex
Genre Analysis
Harald Sack, Hasso-Plattner-Institute for IT-Systems Engineering, Indian Summer School on Linked Data, Leipzig, 12-18. Sep. 2011
Automated AV-Media Analysis
automated content-based analysis is•difficult (error prone) and•complex
Face Detection
Genre Analysis
Harald Sack, Hasso-Plattner-Institute for IT-Systems Engineering, Indian Summer School on Linked Data, Leipzig, 12-18. Sep. 2011
Automated AV-Media Analysis
automated content-based analysis is•difficult (error prone) and•complex
Face Detection
overlay text
Genre Analysis
Harald Sack, Hasso-Plattner-Institute for IT-Systems Engineering, Indian Summer School on Linked Data, Leipzig, 12-18. Sep. 2011
Automated AV-Media Analysis
automated content-based analysis is•difficult (error prone) and•complex
Face Detection
overlay text
Logo Detection
Genre Analysis
Harald Sack, Hasso-Plattner-Institute for IT-Systems Engineering, Indian Summer School on Linked Data, Leipzig, 12-18. Sep. 2011
Automated AV-Media Analysis
automated content-based analysis is•difficult (error prone) and•complex
Face Detection
overlay text
Logo Detection
Genre Analysis
scenetext
Harald Sack, Hasso-Plattner-Institute for IT-Systems Engineering, Indian Summer School on Linked Data, Leipzig, 12-18. Sep. 2011
Automated AV-Media Analysis
automated content-based analysis is•difficult (error prone) and•complex
Face Detection
overlay text
Logo Detection
Genre Analysis
scenetext{
Audio-Mining
structuralanalysis transcription speaker
identification
Harald Sack, Hasso-Plattner-Institute for IT-Systems Engineering, Indian Summer School on Linked Data, Leipzig, 12-18. Sep. 2011
• Result: Video segments with time-based metadata annotations
• Metadata consist of combined low level / high level feature descriptors• Metadata serve as a basis for traditional and semantic retrieval
Metadata Extractiontime
Automated AV-Media Analysis
Harald Sack, Hasso-Plattner-Institute for IT-Systems Engineering, Indian Summer School on Linked Data, Leipzig, 12-18. Sep. 2011
time
e.g., person xylocation yzevent abc
e.g., bibliographical data,geographical data,encyclopedic data, ..
Video Analysis /Metadata Extraction
Entity Recognition/ Mapping
Semantic Multimedia Analysis
Harald Sack, Hasso-Plattner-Institute for IT-Systems Engineering, Indian Summer School on Linked Data, Leipzig, 12-18. Sep. 2011
Some Examples of Automated Video Analysis
Harald Sack, Hasso-Plattner-Institute for IT-Systems Engineering, Indian Summer School on Linked Data, Leipzig, 12-18. Sep. 2011
• Structural Analysis• Intelligent Character Recognition (ICR)
• Character/Logo Detection• Character Filtering• Character Recognition
• Audio Analysis • Speaker Detection • Automated Speech Recognition (ASR)
• Genre Analysis / Categorization•graphic / real• indoor / outdoor•day / night•...
• Face/Body Detection, Tracking & Clustering
Harald Sack, Hasso-Plattner-Institute for IT-Systems Engineering, Indian Summer School on Linked Data, Leipzig, 12-18. Sep. 2011
video
• Automated subdivision of AV media data by structural segmentation• Subdivision of data streams in contentual coherent segments
Structural Analysis
Harald Sack, Hasso-Plattner-Institute for IT-Systems Engineering, Indian Summer School on Linked Data, Leipzig, 12-18. Sep. 2011
video
scenes
• Automated subdivision of AV media data by structural segmentation• Subdivision of data streams in contentual coherent segments
Structural Analysis
Harald Sack, Hasso-Plattner-Institute for IT-Systems Engineering, Indian Summer School on Linked Data, Leipzig, 12-18. Sep. 2011
video
scenes
shots
• Automated subdivision of AV media data by structural segmentation• Subdivision of data streams in contentual coherent segments
Structural Analysis
Harald Sack, Hasso-Plattner-Institute for IT-Systems Engineering, Indian Summer School on Linked Data, Leipzig, 12-18. Sep. 2011
video
scenes
shots
subhots
• Automated subdivision of AV media data by structural segmentation• Subdivision of data streams in contentual coherent segments
Structural Analysis
Harald Sack, Hasso-Plattner-Institute for IT-Systems Engineering, Indian Summer School on Linked Data, Leipzig, 12-18. Sep. 2011
video
scenes
shots
subhots
frames
• Automated subdivision of AV media data by structural segmentation• Subdivision of data streams in contentual coherent segments
Structural Analysis
Harald Sack, Hasso-Plattner-Institute for IT-Systems Engineering, Indian Summer School on Linked Data, Leipzig, 12-18. Sep. 2011
video
scenes
shots
subhots
frames
• Automated subdivision of AV media data by structural segmentation• Subdivision of data streams in contentual coherent segments
Structural Analysis
Harald Sack, Hasso-Plattner-Institute for IT-Systems Engineering, Indian Summer School on Linked Data, Leipzig, 12-18. Sep. 2011
shots
• Shot Boundary Detection
• Identification of• Hard Cuts• Drop Outs• Soft Cuts, as e.g., Dissolve, Wipe, Cross-Fade, etc.
Analytical Shot Boundary Detection• Analysis of Luminance/Chrominance Histograms• Analysis of Edge Distribution• Analysis of Motion Vectors
Machine Learning• Classification of Hard/Soft Cuts based on Image Features• K-Nearest Neighbor• Random Forrest • Support Vector Machines
Histogram Difference Analysis
Motion Vector Analysis
Structural Analysis
Harald Sack, Hasso-Plattner-Institute for IT-Systems Engineering, Indian Summer School on Linked Data, Leipzig, 12-18. Sep. 2011
shots
• Shot Boundary Detection
• Identification of• Hard Cuts
91930 91931 91932919299192891927
Feature Analysis• Luminance Histogram Difference• Chrominance Histogram Difference• Edge Distribution
Structural Analysis
Harald Sack, Hasso-Plattner-Institute for IT-Systems Engineering, Indian Summer School on Linked Data, Leipzig, 12-18. Sep. 2011
shots
• Shot Boundary Detection
• Identification of• Hard Cuts• Drop Outs
Drop Out
Histogram/Chrominance Difference Analysis
Structural Analysis
Harald Sack, Hasso-Plattner-Institute for IT-Systems Engineering, Indian Summer School on Linked Data, Leipzig, 12-18. Sep. 2011
shots
• Shot Boundary Detection
• Identification of• Hard Cuts• Drop Outs• Soft Cuts, as e.g., Dissolve, Wipe, Cross-Fade, etc.
Fade Out
Fade In
Structural Analysis
Harald Sack, Hasso-Plattner-Institute for IT-Systems Engineering, Indian Summer School on Linked Data, Leipzig, 12-18. Sep. 2011
shots
• Shot Boundary Detection
• Identification of• Hard Cuts• Drop Outs• Soft Cuts, as e.g., Dissolve, Wipe, Cross-Fade, etc.
Analytical Shot Boundary Detection• Analysis of Luminance/Chrominance Histograms• Analysis of Edge Distribution• Analysis of Motion Vectors
Machine Learning• Classification of Hard/Soft Cuts based on Image Features• K-Nearest Neighbor• Random Forrest • Support Vector Machines
Histogram Difference Analysis
Motion Vector Analysis
Structural Analysis
Harald Sack, Hasso-Plattner-Institute for IT-Systems Engineering, Indian Summer School on Linked Data, Leipzig, 12-18. Sep. 2011
Face-DetectionFace ClusteringFace Tracking
Character DetectionCharacter Recognition
Logo-Detection
Genre Detection
Automated AV-Media Analysis
Harald Sack, Hasso-Plattner-Institute for IT-Systems Engineering, Indian Summer School on Linked Data, Leipzig, 12-18. Sep. 2011
Intelligent Character Recognition• Preprocessing• Character Identification• Text Preprocessing
• Text Filtering• Adaption of script geometry (Deskew)• Image quality enhancement
• Optical Character Recognition (OCR)• Standard OCR software (OCRopus)
• Postprocessing• Lexical analysis • Statistical / context based filtering Ermittlungen nach
Bombenfunden
Automated AV-Media Analysis
Harald Sack, Hasso-Plattner-Institute for IT-Systems Engineering, Indian Summer School on Linked Data, Leipzig, 12-18. Sep. 2011
• Preprocessing• Character Identification
Filtering• Local Binary Patterns (LBP)• Histogram of Oriented Gradients
Intelligent Character Recognition
Harald Sack, Hasso-Plattner-Institute for IT-Systems Engineering, Indian Summer School on Linked Data, Leipzig, 12-18. Sep. 2011
• Preprocessing• Character Identification
Filtering• Local Binary Patterns (LBP)• Histogram of Oriented Gradients
Intelligent Character Recognition
Harald Sack, Hasso-Plattner-Institute for IT-Systems Engineering, Indian Summer School on Linked Data, Leipzig, 12-18. Sep. 2011
• Preprocessing• Character Identification
Filtering• Local Binary Patterns (LBP)• Histogram of Oriented Gradients
Intelligent Character Recognition
Harald Sack, Hasso-Plattner-Institute for IT-Systems Engineering, Indian Summer School on Linked Data, Leipzig, 12-18. Sep. 2011
Intelligent Character Recognition• Preprocessing
• Character Identification• Text Preprocessing
• Text Filtering• Adaption of script geometry (Deskew)• Image quality enhancement
• Optical Character Recognition (OCR)• Standard OCR software (OCRopus)
• Postprocessing• Lexical analysis • Statistical / context based filtering Ermittlungen nach
Bombenfunden
Automatisierte Audio- und Videoanalyse
Harald Sack, Hasso-Plattner-Institute for IT-Systems Engineering, Indian Summer School on Linked Data, Leipzig, 12-18. Sep. 2011
Original Image Bounding Box
Intelligent Character Recognition
Harald Sack, Hasso-Plattner-Institute for IT-Systems Engineering, Indian Summer School on Linked Data, Leipzig, 12-18. Sep. 2011
Advanced Image Enhancement
Intelligent Character Recognition
Harald Sack, Hasso-Plattner-Institute for IT-Systems Engineering, Indian Summer School on Linked Data, Leipzig, 12-18. Sep. 2011
Standard OCR (OCRopus)
Intelligent Character Recognition
Harald Sack, Hasso-Plattner-Institute for IT-Systems Engineering, Indian Summer School on Linked Data, Leipzig, 12-18. Sep. 2011
Context-based Spell Correction
Intelligent Character Recognition
Harald Sack, Hasso-Plattner-Institute for IT-Systems Engineering, Indian Summer School on Linked Data, Leipzig, 12-18. Sep. 2011
Semantic Multimedia Analysis
Harald Sack, Hasso-Plattner-Institute for IT-Systems Engineering, Indian Summer School on Linked Data, Leipzig, 12-18. Sep. 2011
timeVideo Analysis /Metadata Extraction
e.g., person xylocation yzevent abc
e.g., bibliographical data,geographical data,encyclopedic data, ..
Entity Recognition/ Mapping
Semantic Multimedia Analysis
Harald Sack, Hasso-Plattner-Institute for IT-Systems Engineering, Indian Summer School on Linked Data, Leipzig, 12-18. Sep. 2011
timeVideo Analysis /Metadata Extraction
e.g., person xylocation yzevent abc
e.g., bibliographical data,geographical data,encyclopedic data, ..
Entity Recognition/ Mapping
Semantic Multimedia Analysis
Harald Sack, Hasso-Plattner-Institute for IT-Systems Engineering, Indian Summer School on Linked Data, Leipzig, 12-18. Sep. 2011
Named Entity Recognition
Main Problem in NER: Ambiguity of Terms
Harald Sack, Hasso-Plattner-Institute for IT-Systems Engineering, Indian Summer School on Linked Data, Leipzig, 12-18. Sep. 2011
Named Entity Recognition
Main Problem in NER: Ambiguity of Terms
jaguar
Example: „Jaguar“ in different contexts
Harald Sack, Hasso-Plattner-Institute for IT-Systems Engineering, Indian Summer School on Linked Data, Leipzig, 12-18. Sep. 2011
Named Entity Recognition
rainforest
Main Problem in NER: Ambiguity of Terms
jaguar
Example: „Jaguar“ in different contexts
Harald Sack, Hasso-Plattner-Institute for IT-Systems Engineering, Indian Summer School on Linked Data, Leipzig, 12-18. Sep. 2011
Named Entity Recognition
rainforest
Steve McQueen
Main Problem in NER: Ambiguity of Terms
jaguar
Example: „Jaguar“ in different contexts
Harald Sack, Hasso-Plattner-Institute for IT-Systems Engineering, Indian Summer School on Linked Data, Leipzig, 12-18. Sep. 2011
Named Entity Recognition
rainforest
Steve McQueen
Main Problem in NER: Ambiguity of Terms
jaguar
Example: „Jaguar“ in different contexts
apple
Harald Sack, Hasso-Plattner-Institute for IT-Systems Engineering, Indian Summer School on Linked Data, Leipzig, 12-18. Sep. 2011
Named Entity Recognition
rainforest
Steve McQueen
Main Problem in NER: Ambiguity of Terms
jaguar
Example: „Jaguar“ in different contexts
Context matters!
apple
Harald Sack, Hasso-Plattner-Institute for IT-Systems Engineering, Indian Summer School on Linked Data, Leipzig, 12-18. Sep. 2011
Named Entity Recognition• Mapping keyterms (text) to semantic entities
• Context Analysis and Disambiguation
Semantic Multimedia Analysis
Harald Sack, Hasso-Plattner-Institute for IT-Systems Engineering, Indian Summer School on Linked Data, Leipzig, 12-18. Sep. 2011
Named Entity Recognition• Mapping keyterms (text) to semantic entities
• Context Analysis and Disambiguation
JaguarKeyterm / User Tag
Semantic Multimedia Analysis
Harald Sack, Hasso-Plattner-Institute for IT-Systems Engineering, Indian Summer School on Linked Data, Leipzig, 12-18. Sep. 2011
Named Entity Recognition• Mapping keyterms (text) to semantic entities
• Context Analysis and Disambiguation
JaguarKeyterm / User Tag
Semantic Multimedia Analysis
Jaguar (Car)
Jaguar (Cat)
Jaguar (OS)
Jaguar (Aircraft)
?
?
?
?
Semantic Entities
Harald Sack, Hasso-Plattner-Institute for IT-Systems Engineering, Indian Summer School on Linked Data, Leipzig, 12-18. Sep. 2011
RDF graph to find relations between entities co-occurringin a text maintaining the hypothesis that disambiguationof co-occurring elements in a text can be obtained byfinding connected elements in an RDF graph [7]. In orderto regard the special compilation of non-textual data, staticand user-genrated metadata in audio-visual content our novelapproach combines the use of semantic technologies andLinked Data with linguistic methods.
III. METHOD
According to a study about structure and characteristicsof folksonomy tags [8] an average of 83% of user-generatedtags are single terms. Also, an average of 82% of thereviewed tags are nouns. Based on these study results, weignore tag practices, such as camel case (”barackObama”)and treat tags as subjects or categories describing a resource.As a tag could also be part of a group of nouns representingan entity or a name (”flying machine”,”albert einstein”) thetags stored as single words without any given order have tobe combined in term groups of two or more terms to findall appropriate entities. Hence, every tag or group of tagswithin a given context may represent a distinct entity. Theterm combination process and subsequent mapping of termsand term groups to entities are described in sect. III-B.
To disambiguate ambiguous terms we combine two meth-ods: a co-occurences analysis of the terms in the context inWikipedia articles and an analysis of the page link graph ofthe Wikipedia articles of entity candidates. The scores forboth analysis steps are calculated to a total score.
A. Context Definition
Metadata exists in a certain context and has to be inter-preted according to this context. For tags of audio-visualcontent we identified two dimensions:
• temporal dimension• user-centered dimensionIn the temporal dimension a context can be defined as the
entire video, a segment or a single timestamp in the video.The user-centered dimension classifies a context by howmany users created the concerning metadata - only tags by acertain user or all tags regardless of which user. Fig. 1 showsthe combinations of the two dimensions of contexts formetadata in audio-visual content the interpretation regardingthe significance of a context.
Audio-visual content also provides the opportunity tosupply spatial information. Thus, tags in the same regionof a video frame are considered as related to each other.In the current approach we did not consider this contextdimension.
To describe our approach we use a sample context of ourtest set (see sect. IV). This sample context is composed oftags by only one user at a certain timestamp in the video.The video containing this sample context is a presentation
Figure 1. Dimensions of context definition in audio-visual content
by Dr. Garik Israelian at the TED conference3 entitled ”Howspectroscopy could reveal alien life”4. Our sample contextconsists of the tags ”hubble”, ”spitzer”, ”carbon”, ”dioxide”,”methan”, ”co2”, and ”water”.
B. Preprocessing
Term Combination: Our combination algorithm takesall tags of a specified spatio-temporal context (at a certaintimestamp/in a certain segment of a video, of a singleURL/image and generates every possible combination of atmost three terms of the context in every possible order. Inthat way we make sure to rectify groups of single termsthat belong together. We chose to generate combinationsof three words to make sure to also hit named entitiesconsisting of more than two words, such as ”public keycryptography” or ”alberto santos dumont”. About 90% ofthe DBpedia [9] labels consist of at most three words, butless than 5% consist of 4 words. Due to these numbersand performance issues we decided to limit the number ofterms to be combined to three. Subsequently in this paperby terms we will refer to single terms as well as generatedterm groups. The number c of combinations is calcultaed byc =
�jk=1
n!(n�k)! .
For our sample context containing 7 tags and at most3 terms in a combination (j = 3), 259 combinations aregenerated.
Term Mapping: The terms then have to be mapped tosemantic entities. For our approach we use entities of theLinked Open Data Cloud [10], in particular of the DBpedia,version 3.5.1.
DBpedia provides labels for the identification of distinctentities in 92 languages. We use English and German aswell as Finnish labels, as we noticed that neither English northe German labels contain important acronyms as labels, butthe Finnish language version does. As tagging users prefer tokeep it simple and short[2], resources dealing with ”DomainName System” would rather be tagged with ”DNS” than”Domain Name System”.
After simple string matching of the terms of the contextto DBpedia URIs, the URIs are revised for redirects and
3http://www.ted.com4http://yovisto.com/play/14415
Context Analysis and DisambiguationWhat defines a Context in AV-Data?
• Temporal Coherence • Spatial Coherence• Provenance
Semantic Multimedia Analysis
Harald Sack, Hasso-Plattner-Institute for IT-Systems Engineering, Indian Summer School on Linked Data, Leipzig, 12-18. Sep. 2011
RDF graph to find relations between entities co-occurringin a text maintaining the hypothesis that disambiguationof co-occurring elements in a text can be obtained byfinding connected elements in an RDF graph [7]. In orderto regard the special compilation of non-textual data, staticand user-genrated metadata in audio-visual content our novelapproach combines the use of semantic technologies andLinked Data with linguistic methods.
III. METHOD
According to a study about structure and characteristicsof folksonomy tags [8] an average of 83% of user-generatedtags are single terms. Also, an average of 82% of thereviewed tags are nouns. Based on these study results, weignore tag practices, such as camel case (”barackObama”)and treat tags as subjects or categories describing a resource.As a tag could also be part of a group of nouns representingan entity or a name (”flying machine”,”albert einstein”) thetags stored as single words without any given order have tobe combined in term groups of two or more terms to findall appropriate entities. Hence, every tag or group of tagswithin a given context may represent a distinct entity. Theterm combination process and subsequent mapping of termsand term groups to entities are described in sect. III-B.
To disambiguate ambiguous terms we combine two meth-ods: a co-occurences analysis of the terms in the context inWikipedia articles and an analysis of the page link graph ofthe Wikipedia articles of entity candidates. The scores forboth analysis steps are calculated to a total score.
A. Context Definition
Metadata exists in a certain context and has to be inter-preted according to this context. For tags of audio-visualcontent we identified two dimensions:
• temporal dimension• user-centered dimensionIn the temporal dimension a context can be defined as the
entire video, a segment or a single timestamp in the video.The user-centered dimension classifies a context by howmany users created the concerning metadata - only tags by acertain user or all tags regardless of which user. Fig. 1 showsthe combinations of the two dimensions of contexts formetadata in audio-visual content the interpretation regardingthe significance of a context.
Audio-visual content also provides the opportunity tosupply spatial information. Thus, tags in the same regionof a video frame are considered as related to each other.In the current approach we did not consider this contextdimension.
To describe our approach we use a sample context of ourtest set (see sect. IV). This sample context is composed oftags by only one user at a certain timestamp in the video.The video containing this sample context is a presentation
Figure 1. Dimensions of context definition in audio-visual content
by Dr. Garik Israelian at the TED conference3 entitled ”Howspectroscopy could reveal alien life”4. Our sample contextconsists of the tags ”hubble”, ”spitzer”, ”carbon”, ”dioxide”,”methan”, ”co2”, and ”water”.
B. Preprocessing
Term Combination: Our combination algorithm takesall tags of a specified spatio-temporal context (at a certaintimestamp/in a certain segment of a video, of a singleURL/image and generates every possible combination of atmost three terms of the context in every possible order. Inthat way we make sure to rectify groups of single termsthat belong together. We chose to generate combinationsof three words to make sure to also hit named entitiesconsisting of more than two words, such as ”public keycryptography” or ”alberto santos dumont”. About 90% ofthe DBpedia [9] labels consist of at most three words, butless than 5% consist of 4 words. Due to these numbersand performance issues we decided to limit the number ofterms to be combined to three. Subsequently in this paperby terms we will refer to single terms as well as generatedterm groups. The number c of combinations is calcultaed byc =
�jk=1
n!(n�k)! .
For our sample context containing 7 tags and at most3 terms in a combination (j = 3), 259 combinations aregenerated.
Term Mapping: The terms then have to be mapped tosemantic entities. For our approach we use entities of theLinked Open Data Cloud [10], in particular of the DBpedia,version 3.5.1.
DBpedia provides labels for the identification of distinctentities in 92 languages. We use English and German aswell as Finnish labels, as we noticed that neither English northe German labels contain important acronyms as labels, butthe Finnish language version does. As tagging users prefer tokeep it simple and short[2], resources dealing with ”DomainName System” would rather be tagged with ”DNS” than”Domain Name System”.
After simple string matching of the terms of the contextto DBpedia URIs, the URIs are revised for redirects and
3http://www.ted.com4http://yovisto.com/play/14415
Context Analysis and DisambiguationWhat defines a Context in AV-Data?
• Temporal Coherence • Spatial Coherence• Provenance
Semantic Multimedia Analysis
Spatial Dimension
Harald Sack, Hasso-Plattner-Institute for IT-Systems Engineering, Indian Summer School on Linked Data, Leipzig, 12-18. Sep. 2011
RDF graph to find relations between entities co-occurringin a text maintaining the hypothesis that disambiguationof co-occurring elements in a text can be obtained byfinding connected elements in an RDF graph [7]. In orderto regard the special compilation of non-textual data, staticand user-genrated metadata in audio-visual content our novelapproach combines the use of semantic technologies andLinked Data with linguistic methods.
III. METHOD
According to a study about structure and characteristicsof folksonomy tags [8] an average of 83% of user-generatedtags are single terms. Also, an average of 82% of thereviewed tags are nouns. Based on these study results, weignore tag practices, such as camel case (”barackObama”)and treat tags as subjects or categories describing a resource.As a tag could also be part of a group of nouns representingan entity or a name (”flying machine”,”albert einstein”) thetags stored as single words without any given order have tobe combined in term groups of two or more terms to findall appropriate entities. Hence, every tag or group of tagswithin a given context may represent a distinct entity. Theterm combination process and subsequent mapping of termsand term groups to entities are described in sect. III-B.
To disambiguate ambiguous terms we combine two meth-ods: a co-occurences analysis of the terms in the context inWikipedia articles and an analysis of the page link graph ofthe Wikipedia articles of entity candidates. The scores forboth analysis steps are calculated to a total score.
A. Context Definition
Metadata exists in a certain context and has to be inter-preted according to this context. For tags of audio-visualcontent we identified two dimensions:
• temporal dimension• user-centered dimensionIn the temporal dimension a context can be defined as the
entire video, a segment or a single timestamp in the video.The user-centered dimension classifies a context by howmany users created the concerning metadata - only tags by acertain user or all tags regardless of which user. Fig. 1 showsthe combinations of the two dimensions of contexts formetadata in audio-visual content the interpretation regardingthe significance of a context.
Audio-visual content also provides the opportunity tosupply spatial information. Thus, tags in the same regionof a video frame are considered as related to each other.In the current approach we did not consider this contextdimension.
To describe our approach we use a sample context of ourtest set (see sect. IV). This sample context is composed oftags by only one user at a certain timestamp in the video.The video containing this sample context is a presentation
Figure 1. Dimensions of context definition in audio-visual content
by Dr. Garik Israelian at the TED conference3 entitled ”Howspectroscopy could reveal alien life”4. Our sample contextconsists of the tags ”hubble”, ”spitzer”, ”carbon”, ”dioxide”,”methan”, ”co2”, and ”water”.
B. Preprocessing
Term Combination: Our combination algorithm takesall tags of a specified spatio-temporal context (at a certaintimestamp/in a certain segment of a video, of a singleURL/image and generates every possible combination of atmost three terms of the context in every possible order. Inthat way we make sure to rectify groups of single termsthat belong together. We chose to generate combinationsof three words to make sure to also hit named entitiesconsisting of more than two words, such as ”public keycryptography” or ”alberto santos dumont”. About 90% ofthe DBpedia [9] labels consist of at most three words, butless than 5% consist of 4 words. Due to these numbersand performance issues we decided to limit the number ofterms to be combined to three. Subsequently in this paperby terms we will refer to single terms as well as generatedterm groups. The number c of combinations is calcultaed byc =
�jk=1
n!(n�k)! .
For our sample context containing 7 tags and at most3 terms in a combination (j = 3), 259 combinations aregenerated.
Term Mapping: The terms then have to be mapped tosemantic entities. For our approach we use entities of theLinked Open Data Cloud [10], in particular of the DBpedia,version 3.5.1.
DBpedia provides labels for the identification of distinctentities in 92 languages. We use English and German aswell as Finnish labels, as we noticed that neither English northe German labels contain important acronyms as labels, butthe Finnish language version does. As tagging users prefer tokeep it simple and short[2], resources dealing with ”DomainName System” would rather be tagged with ”DNS” than”Domain Name System”.
After simple string matching of the terms of the contextto DBpedia URIs, the URIs are revised for redirects and
3http://www.ted.com4http://yovisto.com/play/14415
Context Analysis and DisambiguationWhat defines a Context in AV-Data?
• Temporal Coherence • Spatial Coherence• Provenance
Semantic Multimedia Analysis
Temporal Dimension
Spatial Dimension
Harald Sack, Hasso-Plattner-Institute for IT-Systems Engineering, Indian Summer School on Linked Data, Leipzig, 12-18. Sep. 2011
RDF graph to find relations between entities co-occurringin a text maintaining the hypothesis that disambiguationof co-occurring elements in a text can be obtained byfinding connected elements in an RDF graph [7]. In orderto regard the special compilation of non-textual data, staticand user-genrated metadata in audio-visual content our novelapproach combines the use of semantic technologies andLinked Data with linguistic methods.
III. METHOD
According to a study about structure and characteristicsof folksonomy tags [8] an average of 83% of user-generatedtags are single terms. Also, an average of 82% of thereviewed tags are nouns. Based on these study results, weignore tag practices, such as camel case (”barackObama”)and treat tags as subjects or categories describing a resource.As a tag could also be part of a group of nouns representingan entity or a name (”flying machine”,”albert einstein”) thetags stored as single words without any given order have tobe combined in term groups of two or more terms to findall appropriate entities. Hence, every tag or group of tagswithin a given context may represent a distinct entity. Theterm combination process and subsequent mapping of termsand term groups to entities are described in sect. III-B.
To disambiguate ambiguous terms we combine two meth-ods: a co-occurences analysis of the terms in the context inWikipedia articles and an analysis of the page link graph ofthe Wikipedia articles of entity candidates. The scores forboth analysis steps are calculated to a total score.
A. Context Definition
Metadata exists in a certain context and has to be inter-preted according to this context. For tags of audio-visualcontent we identified two dimensions:
• temporal dimension• user-centered dimensionIn the temporal dimension a context can be defined as the
entire video, a segment or a single timestamp in the video.The user-centered dimension classifies a context by howmany users created the concerning metadata - only tags by acertain user or all tags regardless of which user. Fig. 1 showsthe combinations of the two dimensions of contexts formetadata in audio-visual content the interpretation regardingthe significance of a context.
Audio-visual content also provides the opportunity tosupply spatial information. Thus, tags in the same regionof a video frame are considered as related to each other.In the current approach we did not consider this contextdimension.
To describe our approach we use a sample context of ourtest set (see sect. IV). This sample context is composed oftags by only one user at a certain timestamp in the video.The video containing this sample context is a presentation
Figure 1. Dimensions of context definition in audio-visual content
by Dr. Garik Israelian at the TED conference3 entitled ”Howspectroscopy could reveal alien life”4. Our sample contextconsists of the tags ”hubble”, ”spitzer”, ”carbon”, ”dioxide”,”methan”, ”co2”, and ”water”.
B. Preprocessing
Term Combination: Our combination algorithm takesall tags of a specified spatio-temporal context (at a certaintimestamp/in a certain segment of a video, of a singleURL/image and generates every possible combination of atmost three terms of the context in every possible order. Inthat way we make sure to rectify groups of single termsthat belong together. We chose to generate combinationsof three words to make sure to also hit named entitiesconsisting of more than two words, such as ”public keycryptography” or ”alberto santos dumont”. About 90% ofthe DBpedia [9] labels consist of at most three words, butless than 5% consist of 4 words. Due to these numbersand performance issues we decided to limit the number ofterms to be combined to three. Subsequently in this paperby terms we will refer to single terms as well as generatedterm groups. The number c of combinations is calcultaed byc =
�jk=1
n!(n�k)! .
For our sample context containing 7 tags and at most3 terms in a combination (j = 3), 259 combinations aregenerated.
Term Mapping: The terms then have to be mapped tosemantic entities. For our approach we use entities of theLinked Open Data Cloud [10], in particular of the DBpedia,version 3.5.1.
DBpedia provides labels for the identification of distinctentities in 92 languages. We use English and German aswell as Finnish labels, as we noticed that neither English northe German labels contain important acronyms as labels, butthe Finnish language version does. As tagging users prefer tokeep it simple and short[2], resources dealing with ”DomainName System” would rather be tagged with ”DNS” than”Domain Name System”.
After simple string matching of the terms of the contextto DBpedia URIs, the URIs are revised for redirects and
3http://www.ted.com4http://yovisto.com/play/14415
Context Analysis and DisambiguationWhat defines a Context in AV-Data?
• Temporal Coherence • Spatial Coherence• Provenance
Semantic Multimedia Analysis
User-centered Dimension
Temporal Dimension
Spatial Dimension
Harald Sack, Hasso-Plattner-Institute for IT-Systems Engineering, Indian Summer School on Linked Data, Leipzig, 12-18. Sep. 2011
Semantic Multimedia Analysis
Preprocessing
Term Combination
Term Mapping
Entity Candidate Disambiguation
Co-Occurence Analysis
Semantic Graph Analysis
Score Calculation
1956 Stevejaguar
McQueenrim wheel
Steve McQueen ../resource/Steve_McQueen
jaguar ../resource/Jaguar_Cars
wheel rim ../resource/rim_(wheel)
1956 ../resource/1956
NER Custom Workflow
Harald Sack, Hasso-Plattner-Institute for IT-Systems Engineering, Indian Summer School on Linked Data, Leipzig, 12-18. Sep. 2011
Semantic Multimedia Analysis
Preprocessing
Term Combination
Term Mapping
Entity Candidate Disambiguation
Co-Occurence Analysis
Semantic Graph Analysis
Score Calculation
1956 Stevejaguar
McQueenrim wheel
Steve McQueen ../resource/Steve_McQueen
jaguar ../resource/Jaguar_Cars
wheel rim ../resource/rim_(wheel)
1956 ../resource/1956
NER Custom Workflow
only if there is no spatialinformation for compositeterms available
Harald Sack, Hasso-Plattner-Institute for IT-Systems Engineering, Indian Summer School on Linked Data, Leipzig, 12-18. Sep. 2011
Semantic Multimedia AnalysisNamed Entity Recognition Workflow
Term Combination
1956Steve
wheeljaguar
McQueen
rim
Harald Sack, Hasso-Plattner-Institute for IT-Systems Engineering, Indian Summer School on Linked Data, Leipzig, 12-18. Sep. 2011
Semantic Multimedia AnalysisNamed Entity Recognition Workflow
Term Combination
1956Stevewheel jaguar
McQueenrim
Harald Sack, Hasso-Plattner-Institute for IT-Systems Engineering, Indian Summer School on Linked Data, Leipzig, 12-18. Sep. 2011
Semantic Multimedia AnalysisNamed Entity Recognition Workflow
Assigning Entity Candidates
1956Stevewheel jaguar
McQueenrim
7 entity candidates
2 entity candidates
36 entity candidates
1 entity candidate
Harald Sack, Hasso-Plattner-Institute for IT-Systems Engineering, Indian Summer School on Linked Data, Leipzig, 12-18. Sep. 2011
Cooccurrence Analysis
„jaguar“http://dbpedia.org/resource/Jaguar_(Cats)
Harald Sack, Hasso-Plattner-Institute for IT-Systems Engineering, Indian Summer School on Linked Data, Leipzig, 12-18. Sep. 2011
Cooccurrence Analysis
„jaguar“http://dbpedia.org/resource/Jaguar_(Cats)
1956 wheel rimsteve mcqueen
context tags:
Harald Sack, Hasso-Plattner-Institute for IT-Systems Engineering, Indian Summer School on Linked Data, Leipzig, 12-18. Sep. 2011
Cooccurrence Analysis
„jaguar“http://dbpedia.org/resource/Jaguar_(Cats)
1956 wheel rimsteve mcqueen
context tags:
Harald Sack, Hasso-Plattner-Institute for IT-Systems Engineering, Indian Summer School on Linked Data, Leipzig, 12-18. Sep. 2011
Cooccurrence Analysis
„jaguar“http://dbpedia.org/resource/Jaguar_(Cats)
1956 wheel rimsteve mcqueen
context tags:
score: 0.00
Harald Sack, Hasso-Plattner-Institute for IT-Systems Engineering, Indian Summer School on Linked Data, Leipzig, 12-18. Sep. 2011
„jaguar“http://dbpedia.org/resource/Jaguar_Cars
Cooccurrence Analysis
Harald Sack, Hasso-Plattner-Institute for IT-Systems Engineering, Indian Summer School on Linked Data, Leipzig, 12-18. Sep. 2011
„jaguar“http://dbpedia.org/resource/Jaguar_Cars
1956 wheel rimsteve mcqueen
context tags:
Cooccurrence Analysis
Harald Sack, Hasso-Plattner-Institute for IT-Systems Engineering, Indian Summer School on Linked Data, Leipzig, 12-18. Sep. 2011
„jaguar“http://dbpedia.org/resource/Jaguar_Cars
1956 wheel rimsteve mcqueen
context tags:
Cooccurrence Analysis
Harald Sack, Hasso-Plattner-Institute for IT-Systems Engineering, Indian Summer School on Linked Data, Leipzig, 12-18. Sep. 2011
„jaguar“http://dbpedia.org/resource/Jaguar_Cars
1956 wheel rimsteve mcqueen
context tags:
score: 0.87
Cooccurrence Analysis
Harald Sack, Hasso-Plattner-Institute for IT-Systems Engineering, Indian Summer School on Linked Data, Leipzig, 12-18. Sep. 2011
jaguarKeyterm / User Tag
LOD Cloud
Semantic Graph Analysis
1956 Stevejaguar
McQueenrim wheel
context
Jaguar (Car)Steve McQueen
1956
Jaguar (Cat)Jaguar (OS)
Harald Sack, Hasso-Plattner-Institute for IT-Systems Engineering, Indian Summer School on Linked Data, Leipzig, 12-18. Sep. 2011
Overview(1) Multimedia and Semantics(2) Multimedia Metadata and Ontologies(3) Semantic Multimedia Analysis(4) Semantic Multimedia Retrieval
Semantic MultimediaIndian Summer School on Linked Data, Leipzig, 15 Sep. 2011
Harald Sack, Hasso-Plattner-Institute for IT-Systems Engineering, Indian Summer School on Linked Data, Leipzig, 12-18. Sep. 2011
Searching is not always just searching...
Harald Sack, Hasso-Plattner-Institute for IT-Systems Engineering, Indian Summer School on Linked Data, Leipzig, 12-18. Sep. 2011
Searching is not always just searching
a simple example:
I‘m looking for a book by Earnest Hemingway with the title ,For Whom the Bell Tolls‘ in the first German edition...“
Harald Sack, Hasso-Plattner-Institute for IT-Systems Engineering, Indian Summer School on Linked Data, Leipzig, 12-18. Sep. 2011
Wem die Stunde schlägt. - Ernest H E M I N G W A Y. (Stockholm usw., Bermann-Fischer Verlag, 1941) 560 S. 8“
II 1, 2506, 34548
Searching is not always just searching
Harald Sack, Hasso-Plattner-Institute for IT-Systems Engineering, Indian Summer School on Linked Data, Leipzig, 12-18. Sep. 2011
...but what if...
I really liked the book ,For Whom the Bell Tolls‘ but I have no idea what I should read next....
Harald Sack, Hasso-Plattner-Institute for IT-Systems Engineering, Indian Summer School on Linked Data, Leipzig, 12-18. Sep. 2011
...but what if...
I really liked the book ,For Whom the Bell Tolls‘ but I have no idea what I should read next....
Harald Sack, Hasso-Plattner-Institute for IT-Systems Engineering, Indian Summer School on Linked Data, Leipzig, 12-18. Sep. 2011
Exploratory Search• What, if the user does not know, which query string to use?
• What, if the user is looking for complex answers ?
• What, if the user does not know the domain he/she is looking for?• What, if the user wants to know all(!) about a specific topic?
• ...,Browsing‘ instead of ,Searching‘• ...to find something by chance• ...serendipitous findings• ...to get an overview• ...enable content based navigation
Harald Sack, Hasso-Plattner-Institute for IT-Systems Engineering, Indian Summer School on Linked Data, Leipzig, 12-18. Sep. 2011
How to implement an exploratory search?
Harald Sack, Hasso-Plattner-Institute for IT-Systems Engineering, Indian Summer School on Linked Data, Leipzig, 12-18. Sep. 2011
time
e.g., person xylocation yzevent abc
e.g., bibliographical data,geographical data,encyclopedic data, ..
Video Analysis /Metadata Extraction
Entity Recognition/ Mapping
Semantic Video Search
Harald Sack, Hasso-Plattner-Institute for IT-Systems Engineering, Indian Summer School on Linked Data, Leipzig, 12-18. Sep. 2011
Data is a precious thing and will last longer than the systems themselves. (Tim Berners-Lee) http://linkeddata.org/
The Web of Data - The Semantic Web
Harald Sack, Hasso-Plattner-Institute for IT-Systems Engineering, Indian Summer School on Linked Data, Leipzig, 12-18. Sep. 2011
http://dbpedia.org/
Harald Sack, Hasso-Plattner-Institute for IT-Systems Engineering, Indian Summer School on Linked Data, Leipzig, 12-18. Sep. 2011
dbpedia:For_Whom_the_Bell_Tolls
What facts for dbpedia:For_Whom_the_Bell_Tollsare relevant?
http://dbpedia.org/page/For_Whom_the_Bell_Tolls
DBPedia - the Semantic Wikipedia
...use heuristics
Harald Sack, Hasso-Plattner-Institute for IT-Systems Engineering, Indian Summer School on Linked Data, Leipzig, 12-18. Sep. 2011
Exploratory Search
dbpedia-owl:author
dbpedia:Ernest_Hemingwaydbpedia:For_Whom_the_Bell_Tolls
Harald Sack, Hasso-Plattner-Institute for IT-Systems Engineering, Indian Summer School on Linked Data, Leipzig, 12-18. Sep. 2011
Exploratory Search
dbpedia-owl:author
dbpedia:Ernest_Hemingwaydbpedia:For_Whom_the_Bell_Tolls
dbpe
dia-
owl:a
utho
r
Harald Sack, Hasso-Plattner-Institute for IT-Systems Engineering, Indian Summer School on Linked Data, Leipzig, 12-18. Sep. 2011
Exploratory Search
dbpedia-owl:author
dbpedia:Ernest_Hemingwaydbpedia:For_Whom_the_Bell_Tolls
dbpe
dia-
owl:a
utho
r
dbpedia-owl:author
Harald Sack, Hasso-Plattner-Institute for IT-Systems Engineering, Indian Summer School on Linked Data, Leipzig, 12-18. Sep. 2011
Exploratory Search
dbpedia-owl:author
dbpedia:Ernest_Hemingwaydbpedia:For_Whom_the_Bell_Tolls
dbpe
dia-
owl:a
utho
r
dbpedia-owl:author
dbpedia-owl:author
Harald Sack, Hasso-Plattner-Institute for IT-Systems Engineering, Indian Summer School on Linked Data, Leipzig, 12-18. Sep. 2011
dbpedia-owl:author
dbpedia:Ernest_Hemingwaydbpedia:For_Whom_the_Bell_Tolls
Exploratory Search
Harald Sack, Hasso-Plattner-Institute for IT-Systems Engineering, Indian Summer School on Linked Data, Leipzig, 12-18. Sep. 2011
dbpedia-owl:author
dbpedia:Ernest_Hemingwaydbpedia:For_Whom_the_Bell_Tolls
dbpedia:Raymond_Carver
dbpedia-
owl:influenced_by
Exploratory Search
Harald Sack, Hasso-Plattner-Institute for IT-Systems Engineering, Indian Summer School on Linked Data, Leipzig, 12-18. Sep. 2011
dbpedia-owl:author
dbpedia:Ernest_Hemingwaydbpedia:For_Whom_the_Bell_Tolls
dbpedia:Raymond_Carver
dbpedia-
owl:influenced_by
dbpedia:Jack_Kerouac
dbpe
dia-
owl:i
nflu
ence
d_by
Exploratory Search
Harald Sack, Hasso-Plattner-Institute for IT-Systems Engineering, Indian Summer School on Linked Data, Leipzig, 12-18. Sep. 2011
dbpedia-owl:author
dbpedia:Ernest_Hemingwaydbpedia:For_Whom_the_Bell_Tolls
dbpedia:Raymond_Carver
dbpedia-
owl:influenced_by
dbpedia:Jack_Kerouac
dbpe
dia-
owl:i
nflu
ence
d_by
dbpedia-owl:influenced_by
dbpedia:Jerome_D._Salinger
Exploratory Search
Harald Sack, Hasso-Plattner-Institute for IT-Systems Engineering, Indian Summer School on Linked Data, Leipzig, 12-18. Sep. 2011
dbpedia:Jack_Kerouac dbpedia:Raymond_Carverdbpedia:Jerome_D._Salinger
Exploratory Search
Harald Sack, Hasso-Plattner-Institute for IT-Systems Engineering, Indian Summer School on Linked Data, Leipzig, 12-18. Sep. 2011
dbpedia:Jack_Kerouac dbpedia:Raymond_Carverdbpedia:Jerome_D._Salinger
dbpedia-owl:notableWork
Exploratory Search
Harald Sack, Hasso-Plattner-Institute for IT-Systems Engineering, Indian Summer School on Linked Data, Leipzig, 12-18. Sep. 2011
dbpedia:Jack_Kerouac dbpedia:Raymond_Carverdbpedia:Jerome_D._Salinger
dbpedia-owl:notableWork dbpedia-owl:notableWork
Exploratory Search
Harald Sack, Hasso-Plattner-Institute for IT-Systems Engineering, Indian Summer School on Linked Data, Leipzig, 12-18. Sep. 2011
dbpedia:Jack_Kerouac dbpedia:Raymond_Carverdbpedia:Jerome_D._Salinger
dbpedia-owl:notableWork dbpedia-owl:notableWork dbpedia-owl:notableWork
Exploratory Search
Harald Sack, Hasso-Plattner-Institute for IT-Systems Engineering, Indian Summer School on Linked Data, Leipzig, 12-18. Sep. 2011
...and how does an exploratory search look like?
Harald Sack, Hasso-Plattner-Institute for IT-Systems Engineering, Indian Summer School on Linked Data, Leipzig, 12-18. Sep. 2011
29
http://mediaglobe.yovisto.com:8080
Harald Sack, Hasso-Plattner-Institute for IT-Systems Engineering, Indian Summer School on Linked Data, Leipzig, 12-18. Sep. 2011
2929
Semantische SuchtechnologienExplorative Suche in audiovisuellen Daten
J. Waitelonis, H. Sack, Z. Kramer, J. Hercher:Semantically Enabled Exploratory Video Search, in Proc. of Semantic Search Workshop (SemSearch10) at the 19th Int. World Wide Web Conference (WWW2010), 26-30 April 2010, Raleigh, NC, USA, 2010.
Harald Sack, Hasso-Plattner-Institute for IT-Systems Engineering, Indian Summer School on Linked Data, Leipzig, 12-18. Sep. 2011
2929
Semantische SuchtechnologienExplorative Suche in audiovisuellen Daten
J. Waitelonis, H. Sack, Z. Kramer, J. Hercher:Semantically Enabled Exploratory Video Search, in Proc. of Semantic Search Workshop (SemSearch10) at the 19th Int. World Wide Web Conference (WWW2010), 26-30 April 2010, Raleigh, NC, USA, 2010.
Harald Sack, Hasso-Plattner-Institute for IT-Systems Engineering, Indian Summer School on Linked Data, Leipzig, 12-18. Sep. 2011
29
J. Waitelonis, H. Sack, Z. Kramer, J. Hercher:Semantically Enabled Exploratory Video Search, in Proc. of Semantic Search Workshop (SemSearch10) at the 19th Int. World Wide Web Conference (WWW2010), 26-30 April 2010, Raleigh, NC, USA, 2010.
Harald Sack, Hasso-Plattner-Institute for IT-Systems Engineering, Indian Summer School on Linked Data, Leipzig, 12-18. Sep. 2011
29
J. Waitelonis, H. Sack, Z. Kramer, J. Hercher:Semantically Enabled Exploratory Video Search, in Proc. of Semantic Search Workshop (SemSearch10) at the 19th Int. World Wide Web Conference (WWW2010), 26-30 April 2010, Raleigh, NC, USA, 2010.
29
Semantische SuchtechnologienExplorative Suche in audiovisuellen Daten
Harald Sack, Hasso-Plattner-Institute for IT-Systems Engineering, Indian Summer School on Linked Data, Leipzig, 12-18. Sep. 2011
29
J. Waitelonis, H. Sack, Z. Kramer, J. Hercher:Semantically Enabled Exploratory Video Search, in Proc. of Semantic Search Workshop (SemSearch10) at the 19th Int. World Wide Web Conference (WWW2010), 26-30 April 2010, Raleigh, NC, USA, 2010.
29
Semantische SuchtechnologienExplorative Suche in audiovisuellen Daten
Harald Sack, Hasso-Plattner-Institute for IT-Systems Engineering, Indian Summer School on Linked Data, Leipzig, 12-18. Sep. 2011
29
J. Waitelonis, H. Sack, Z. Kramer, J. Hercher:Semantically Enabled Exploratory Video Search, in Proc. of Semantic Search Workshop (SemSearch10) at the 19th Int. World Wide Web Conference (WWW2010), 26-30 April 2010, Raleigh, NC, USA, 2010.
29
Semantische SuchtechnologienExplorative Suche in audiovisuellen Daten
Harald Sack, Hasso-Plattner-Institute for IT-Systems Engineering, Indian Summer School on Linked Data, Leipzig, 12-18. Sep. 2011
29
Harald Sack, Hasso-Plattner-Institute for IT-Systems Engineering, Indian Summer School on Linked Data, Leipzig, 12-18. Sep. 2011http://bit.ly/SeMEX
Harald Sack, Hasso-Plattner-Institute for IT-Systems Engineering, Indian Summer School on Linked Data, Leipzig, 12-18. Sep. 2011
Overview(1) Multimedia and Semantics(2) Multimedia Metadata and Ontologies(3) Semantic Multimedia Analysis(4) Semantic Multimedia Retrieval
Semantic MultimediaIndian Summer School on Linked Data, Leipzig, 15 Sep. 2011
Harald Sack, Hasso-Plattner-Institute for IT-Systems Engineering, Indian Summer School on Linked Data, Leipzig, 12-18. Sep. 2011
Contact:Dr. Harald SackHasso-Plattner-Institut für SoftwaresystemtechnikUniversität PotsdamProf.-Dr.-Helmert-Str. 2-3D-14482 Potsdam
Homepage:http://www.hpi.uni-potsdam.de/meinel/team/sack.html http://www.yovisto.com/Blog: http://moresemantic.blogspot.com/E-Mail: [email protected] [email protected]: lysander07 / biblionomicon / yovisto
Thank you for
your Attention!