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Prepared by: NKA First Prepared on:1st May 2007 Last Modified on: xxxxxxQuality checked by: AQ
Copyright 2006 Asia Pacific University College of Technology and Innovation
Chapter 1:
Introduction to multimedia &
multimedia system
Icon & Time Based MultimediaCT057-3-2
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Topic & Structure of the lesson
1. To introduce multimedia as a concept
2. Levels of multimedia system
3. Challenges, key issues and desirable features ofmultimedia systems
4. Components of multimedia systems
5. Applications of multimedia systems
6. Current trends in multimedia systems
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Learning Outcomes
1. Define, compare and contrast between the terms, multimedia and
multimedia system.
2. List the various levels of multimedia systems
3. List some challenges, key issues and desirable features of
multimedia applications.
4. Explain the components in a Multimedia System
5. Explain the various types of Multimedia Application available
currently
6. Discuss current trends in Multimedia Application
At the end of this lecture, YOU should be able to:
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Key Terms you must be able to use
If you have mastered this topic, you should be able to use the
following terms correctly in your assignments and exams:
Multimedia and Multimedia System
Text
Animation
Graphics
Audio
Video
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Main Teaching Points
Introduction to multimedia & multimedia system (e.g.
definition)
Levels of multimedia application. Issues associated with multimedia like challenges, key
issues, components and trends will be discussed.
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Introduction to Multimedia, Multimedia Application
and Multimedia Systems.
Chapter 1
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Multimedia can have a many definitions these include:
Multimedia means that computer information can be
represented through audio, video, and animation in
addition to traditional media (i.e., text, graphics/drawings,
images).
Any combination of different media types inclusive of
text, graphics, animations, audio and video.
What is multimedia?
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A good general definition is:
Multimedia is the field concerned with the computer-
controlled integration of text, graphics, drawings, still and
moving images (Video), animation, audio, and any other
media where every type of information can be
represented, stored, transmitted and processed digitally.
What is multimedia?
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What is a multimedia system?
A system which achieves its aim through the
careful combination of different types of
media
As with all systems a multimedia system mustbe well designed with a clear aim and a set of
objectives which will fulfil that aim.
Multimedia systems by definition will includeseveral different types of media used in
pursuit of the objectives.
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Levels of Multimedia Systems
Presentation using multimedia
No interaction
A Video
Interactive Multimedia
User has control of which parts of the system have
focus and when
A DVD
Hypermedia
A structure of linked elements with navigation
A web page
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Quick Review Question
Suggest some multimedia applications which are:
Presentation type
Interactive
Hypermedia
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Challenges for Multimedia Systems
Distributed Networks
Temporal relationship between data Render different data at same time continuously.
Sequencing within the media Playing frames in correct order/time frame in
video
Synchronisation inter-media scheduling E.g.Video and Audio Lip synchronisation is clearly
important for humans to watch playback of video andaudio and even animation and audio.
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Key Issues for Multimedia Systems
The key issues multimedia systems need to deal
with here are:
How to represent and store temporal information.
How to strictly maintain the temporal relationships onplayback/retrieval
What process are involved in the above.
Data has to represented digitally AnalogDigital
Conversion, Sampling etc.
Large Data Requirementsbandwidth, storage,
compression
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Desirable Features for a Multimedia
System
Given the key issues mentioned previously thefollowing feature a desirable (if not aprerequisite) for a Multimedia System:
Very High Processing Power needed to deal with large
data processing and real time delivery of media. Special
hardware commonplace.
Multimedia Capable File Systemneeded to deliver real-
time media e.g. Video/Audio Streaming.
Special Hardware/Software needed e.g RAID technology.
Data Representations File Formats that support
multimedia should be easy to handle yet allow for
compression/decompression in real-time.
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Continued..
Efficient and High I/O
input and output to the filesubsystem needs to be efficient and fast. Needs to allowfor real-time recording as well as playback of data. e.g.Direct to Disk recording systems.
Special Operating Systemto allow access to file
system and process data efficiently and quickly. Needsto support direct transfers to disk, real-time scheduling,fast interrupt processing, I/O streaming etc.
Storage and Memory large storage units (of theorder of 50 -100 Gb or more) and large memory (50 -100Mb or more).
Network Support Client-server systems common asdistributed systems common.
Software Tools user friendly tools needed to handle
media, design and develop applications, deliver media.
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Components of a Multimedia
System
Now let us consider the Components (Hardware and Software)
required for a multimedia system:
Capture devices Video Camera, Video Recorder, Audio
Microphone, Keyboards, mice, graphics tablets, 3D input devices,
tactile sensors, VR devices. Digitising/Sampling HardwareStorage DevicesHard disks, CD-ROMs, Jaz/Zip drives, DVD,etc
Communication NetworksEthernet, Token Ring, FDDI, ATM,
Intranets, Internets.
Computer Systems Multimedia Desktop machines,
Workstations, MPEG/VIDEO/DSP Hardware
Display Devices CD-quality speakers, HDTV,SVGA, Hi-Res
monitors, Colour printers etc.
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Applications of Multimedia
Examples of Multimedia Applications include:
World Wide Web
Hypermedia courseware
Video conferencing
Video-on-demand Interactive TV
Groupware
Home shopping
Games
Virtual reality
Digital video editing and production systems
Multimedia Database systems
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Trends in Multimedia
Current big applications areas in Multimedia include:
World Wide Web Hypermedia systems embrace
nearly all multimedia technologies and application areas.
MBone
Multicast Backbone: Equivalent of
conventional TV and Radio on the Internet.
Enabling Technologies developing at a rapid rate to
support ever increasing need for Multimedia. Carrier,
Switching, Protocols, Applications, Coding/Compression, Database,
Processing, and System Integration Technologies at the
forefront of this
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Q & A
Question and Answer Session
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Time Based M ltimedia CT048 3 2 Introd ction to m ltimedia & m ltimedia s stem
Next Chapter
Elements of Multimedia