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IMPLEMENTATION OF FHT BASED DIGITAL WATER MARKING TECHNIQUETRANSCRIPT
IMPLEMENTATION OF FHT BASED DIGITAL IMPLEMENTATION OF FHT BASED DIGITAL WATER MARKING TECHNIQUEWATER MARKING TECHNIQUE
L. ANIL KUMAR
INTRODUCTION
EXISTING SYSTEMEXISTING SYSTEM
Digital Watermark is an invisible mark inserted into
the digital multimedia data so that it can be detected in the
later stage of evidence of rightful ownership. A great deal of
research efforts has been focused on digital watermark in
recent years. The techniques proposed so far can be divided
into two main groups of according to the embedding domain of
the container image
1) Spatial Domain Approach:
One group is SPATIAL domain approach .The
earliest watermarking techniques are mainly this kind and the
simplest example is to embed the watermark into least
significant bits(LSB) of the image pixels. However, this
technique has relatively low information hiding capacity and
can be easily erased by lossy image compression.
2) FREQUENCY DOMAIN APPROACH
The other group is FREQUENCY domain approach. This
can embed more information bits and is relatively robust to attacks.
They embedded a Guassian distributed sequence into the perceptually
most significant frequency components of the container image.
Another technique embedded an image watermark into selectively
modified middle frequency of discrete cosine transform coefficients.
One more algorithm embedded watermark using Fourier
transformations that is invariant to image manipulations or attacks
due to rotation scaling and translation. Still several methods used to
hide the data to the frequency domain such as HVS, JND.
DRAWBACKS OF EXISTING SYSTEM
The major problem with many of these
watermarking schemas is that they are not very robust
against different types of image manipulations or attacks.
Moreover, some of these techniques are quite complicated to
implement in real-time.
PROPOSED SYSTEM
Due to above mentioned failures a new
technique has been proposed so that to cover and
maintain the drawbacks prevailed in the previous
system and hence a technique called Fast Hadamard
Transformation is proposed
ADVANTAGES
The FHT embedding algorithm was found to
provide a robust and efficient approach to perform
digital watermarking of digital image data for
copyright protection and proof of rightful
ownership.
The simplicity of FHT offers a significant
advantage in shorter processing time and ease of
hardware implementation.
REQUIREMENTS REQUIREMENTS
Hardware Requirements:
-Processor :Pentium4
-RAM :128MB
-Hard disk :4.2GB
Software Requirements:
-Operating system :Windows98
-Tool :JDK1.4.2
Needs of watermarkingNeeds of watermarking
o Copies can be produced easily and inexpensively.
o Copies are exact duplicates and therefore indistinguishable from the original.
o Copies can be distributed rapidly,especially in today’s networked world.
AN INTRODUCTION TO AN INTRODUCTION TO WATERMARKINGWATERMARKING
o Descendent of a steganography .
o Watermark—an invisible signature embedded inside an image to show authenticity or proof of ownership.
o Discourage unauthorized copying and distribution of images over the internet.
STEGANOGRAPHYSTEGANOGRAPHY
o Steganography is a technique for concealed
communication .
o In steganography the very existence of the message that
is communicated is a secret.
o Techniques of steganography like use of invisible ink,
word spacing patterns in printed documents, coding
messages in music compositions, etc.,
WATERMARKINGWATERMARKING
Watermarking can be considered as a special
technique of steganography where one message
is embedded in another and the two messages
are related to each other in some way.
Eg: Currency Notes and Logos
Digital Watermarking ProcessDigital Watermarking Process
Watermarkkey
CoverSignal
WatermarkSignal
Communication
Channel
Noise Attacks
WatermarkDetector
Watermark
Key
Watermark Embedder
Watermark
CommunicationChannel
FEATURES OF DIGITALWATERMARKINGFEATURES OF DIGITALWATERMARKING
o Imperceptibility
o Robustness
o Inseparability
o Security
Classifications of digital Classifications of digital watermarkingwatermarking
o Robust&Fragile Watermarking
o Visible&Transparent Watermarking
o Public&Private Watermarking
o Symmetric&Asymmetric Watermarking
o Stegnography&Non-steganography
Symmetric watermarkingSymmetric watermarking
The key for embedding and detection of
the watermark are identical. The detector must
know the required private key for extracting the
watermark from the digital data.
Asymmetric WatermarkingAsymmetric Watermarking
This depicts a general asymmetric
watermarking scheme. With aid of a
private and a public key, the watermark is
embedded into the host signal(Original
data)
Applications of digital Applications of digital watermarkingwatermarking
o Copyright Protection:
-Digital watermarks can be used to identify and protect
copyright ownership.
o Tracking:
-Digital watermarks can be used to track the usage of digital
content
Applications of Digital Applications of Digital watermarkingwatermarking
o Tamper Proofing:
-Digital watermarks, which are fragile in
nature, can be used for tamper proofing.o Broadcast Monitoring:
-Digital watermarks can be used to
monitor broadcasted content like
television and broadcast radio signals.
Digital watermarkingDigital watermarking
using
FHT
2D-Hadamard Transform of Signal2D-Hadamard Transform of Signal
Let [U] represents the original image and
[V] the transformed image, the 2D-Hadamard
transform is given by
Hn [U] Hn
[V]= ---------------- N
Hn represents N * N Hadamard matrix
2D-IFHT2D-IFHT
Hn [V] Hn
[U]= ---------------- N
where Hn = Hn-1 * H1
Hn-1 Hn-1
Hn =
Hn-1 - Hn-1
In our algorithm, the processing is performed
based on 8x8 sub-blocks of the whole image, the
third order Hadamard transform matrix H3 is used.
1 1 1 1 1 1 1 1
1 1 1 1 1 1 1 1
1 1 1 1 1 1 1 1
1 1 1 1 1 1 1 1
1 1 1 1 1 1 1 1
1 1 1 1 1 1 1 1
1 1 1 1 1 1 1 1
1 1 1 1 1 1 1 1
nH
Watermark Insertion ProcessWatermark Insertion Process
Transform watermark and Original Image into FHT coefficients
Pseudo-randomly select sub blocks of Original Image for Insertion
Watermark Insertion + Apply FHTon each sub block
Watermarked Image + Key File
Watermark Extraction ProcessWatermark Extraction Process
Identify relevant sub blocks for watermark Extraction using random generator
Extract watermark
Apply IFHT on extracted bits
Construct watermark from extracted bits + Key File Components
MODULES IN OUR PROPOSED SYSTEM
INSERTION OF WATERMARK INTO
ORIGINAL IMAGE
EXTRACTION OF WATERMARK FROM
WATERMARKED IMAGE
METHODS USED
ImageBuild (Original,Watermark)
performFHTOnWatermark()
randomGenerator()
insertWatermark()
performFHTOnOriginal()
performIFHTOnOriginal()
loading()
METHOD DETAILS
METHODS USED FOR INSERTION OF WATERMARK
performFHTOnWatermark() : In this function the FHT algorithm is
applied on the watermark image according to the size of it. If it is 16
X 16 image then we use a H4 Hadamard coefficient in the algorithm.
The coefficient is selected in such a way that the size of the image is
converted to the power of 2 and the power obtained is selected as
the suffix of H.
Let [U] represents the original image and [V] the transformed image,
the 2D-Hadamard transform is given by
[V]= Hn [U] Hn
N
Where Hn represents and NxN Hadamard matrix, N=2n,
n=1, 2, 3….with element values either +1 or -1.
Also in this method the AC and DC components are
separated after applying FHT on watermark image.
randomGenerator() : An m-sequence random generator
is applied on the original image which is divided into sub
blocks. These random points are used for inserting ac
components of the watermark image into original image.
insertWatermark() : In this method firstly the original
image is divided into sub blocks in such a way that if the
original image is of the size 256 X 256 be sub divided into
8 X 8 sub blocks. Now the AC components of the
watermark image are inserted into randomly selected
points of the sub blocks. The dc components are stored in
a Keyfile.dat.
performFHTOnOriginal() : In this method after
inserting the AC components into random positions of
original image,the resultant image is subjected to
application of FHT algorithm individually on each sub-
block.
Let [X] represents the original image and [Y] the
transformed image, the 2D-Hadamard transform is
given by
[Y]= Hn [X] Hn
N
Where Hn represents and NxN Hadamard matrix,
N=2n, n=1, 2, 3….with element values either +1 or -1.
METHOD USED FOR EXTRACTION
performIFHTOnOriginal(): In this method the reverse process of
insertion of watermark into original image is carried on. Firstly it gets
the values of random points selected for insertion of AC components
of watermark image from Keyfile.dat. Next,it gets the values of DC
components stored in Keyfikle.dat. Now,the watermarked image is
sub-divided in blocks and from the positions of AC inserted points
the AC components are retrieved.On combination of these AC and DC
components the watermark image is obtained.
[X]= Hn [Y] Hn
N
OVERALL CLASS DIAGRAMOVERALL CLASS DIAGRAM
EmbedACComp : BooleanRandPts : IntegerResImg1 : StringResImg2 : String
Embed()
BlockDivisionOrgImg : StringResImg : String
Division()
FHTonWatermarkImgWaterImg : StringWaterImg1 : String
ApplyFHT()
UserOrgImg : StringWaterImg : String
SelectOrgImg()SelectWaterImg()
Random GenerationRandPts : IntegerResImg : StringResImg1 : String
RanSelect()
KEYFILEDCcomp : StringRandPts : String
Store()
SeperateAC&DCWaterImg1 : StringACcomp : IntegerDCcomp : Integer
SeperateAC()SeperateDC()
FHTResImg2 : StringResImg3 : String
ApplyFHT()
INVFHTDCComp : IntegerResImg3 : StringRandPts : IntegerWaterImg : String
ApplyInversFHT()
OVERALL USECASE DIAGRAMS
Perform FHT On Watermark
Block Division of original
Random Generation
Seperation of AC and DC
Insertion of AC
Perform FHT on Inserted Image
<<include>>
Store DC and RandPts
<<include>>
USER
Perform IFHT
<<include>>
OVERALL SEQENCE DIAGRAMS
u:User w:WatermarkImg
r:ResultImg k:KeyFile o:OriginalImg
b:Blockdivision
r:RandomGeneration
r1:ResultImg w1:WatermarkingImg
1: selectwatermarkimg
2: PerformFHT
3: Seperate DC comp
4: Select Original Img
5: Divide into Sub Blocks
6: Select Randomly Sub Blocks
7: Store randomly selected pts and place in key file
8: Give Ac Compts for Insertion
9: Res Imge Sent for Ac Comp for Insertion
10: Apply FHT
SEQUENCE DIAGRAM FOR INSERTION
u:User bd:BlockDivision1
k:KeyFile eb:Embeded wm:WatermarImage
ac:AC Components
1: Div Watermarked image into Sub Blocks
2: Get RandomPts
3: Get Ac Comp
4: Get DC Comp
5: Get AC Comp
6: Get WatermarkImg
SEQUENCE DIAGRAM FOR EXTRACTION
OVERALL ACTIVITY DIAGRAMS
Start
Select OriginalImg
Select Watermark Img
Apply FHT on WaterMark
Sep AC and DC Comp
Store DC Comp in Keyfile.dat
Divide into Sub-Blocks
Using random Seq Gen Select Sub-Blocks Randomly
Store These into KeyFile.datEmbed
Apply FHT on Each BlockSeperate
AC Comp
ACTIVITY FOR INSERTION
Select Watermarked Image
Get the Random Pts from Keyfile
Extract AC Comp From Random Pts
Get DC Comp From KeyFile
Combine AC and DC Coeff
START
Get the Watermark Img
ACTIVITY FOR EXTRACTION
OVERALL DATA FLOW DIAGRAMS
LEVEL 0
LEVEL 1
Select Image for Watermarking
Embed Watermark into image
Extract Watermark from Original Image
LEVEL 2
WORKING PROCESS
Watermark image
Insert watermark into Image
Original Image
Process Image
Watermark with AC Components
Watermark inserted Image
Extract Watermark
Process Image
Extracted Watermark
Watermark image
SCREENSHOTS
IN THIS SCREEN THE PROGRAM IS COMPILED AND EXECUTED
INITIALLY THIS SCREEN APPEARS
FOR SELECTING ORIGINAL IMAGE GOTO FILE MENU AND SELECT OPEN MENU ITEM IN THE MENU BAR
AFTER SELECTING THE ORIGINAL AND WATERMARK IMAGE THIS SCREEN APPEARS
AFTER PRESSING INSERT WATERMARK BUTTON IN THE PREVIOUS SCREEN THIS SCREEN APPEARS WITH INSERTED WATERMARK IN THE ORIGINAL IMAGE
AFTER PRESSING THE BUTTON EXTRACT WATERMARK IN THE PREVIOUS SCREEN THIS SCREEN APPEARS WITH THE EXTRACTED WATERMARK
CONCLUSION AND SCOPE FOR FURTHER DEVELOPMENT
This paper has presented a robust hybrid watermarking
technique for Embedding characters or grayscale image
watermark into a container image based on the FHT. The
embedding and extracting processes have been described in
detail. The experimental results show that the proposed method is
robust against approximately 70% of attacks.
When compared with the DCT ,it is found to be more robust
against various attacks. It also refers significant advantage in
terms of shorter processing time and the ease of hardware
implementation than many common transform techniques.
FUTURE SCOPE
The future scope of this project includes
o In this project we use a gray scale image for watermark
image to insert into original image. In future, we may use a
color image instead of the gray scale image.
o In this proposed algorithm,according to the size of the image
we have to multiply the hadamard coefficient(Hn).In future
we may use an algorithm which provides the same formula
for embedding different sizes of water mark image to
different sizes of original image