DESIGN OF REVERSIBLE WATERMARKING ALGORITHM USING DWT TECHNIQUE

PROJECT GUIDE Mr.P.RAMESH YADAV , M.Tech., Asst.Professor, Dept of ECE By

B.SHAFIULLAH

K.GHOUSE BASHA

A.ASHOK KUMAR

K.RAGHAVENDRA REDDY K.SIVANANDA REDDY

DEISIGN OF REVERSIBLE WATERMARKING ALGORITHM USING DWT TECHNIQUE

HEAD OF THE DEPARTMENTMr.C.Md.ASLAM, M.Tech(Ph.D) Asst.Professor, Dept.of ECE

Contents:1.Absract2.Introduction3.Watermarking4.Types of watermarking5.Applications6.Reversible watermarking7.Advantages8.Design of HDL9.DWT block10.Embedder block11.Conclusion

Abstract:Based on the algorithm developed for Matlab modeling, a new architecture for Reversible Watermarking was designed and the hardware modeling for that architecture was done using Verilog HDL

INTRODUCTION

With the result of advancement in today’s technology, digital content can be easily copied, modified, or distributed.

Watermarking provides the solution to this problem.

Watermarking –

The term stands for the hiding of some message or other kind of information in to an image.

What is watermarking ?

Types of Watermarks

Robust watermarks: mainly aimed at Copyright protection. i.e., designed to resist against manipulations

Fragile watermarks mainly aimed at content authentication i.e. once the authentication is success, then only the image can be retrieved (Security purpose).

Applications of Watermarking

Medical and Military Images

It can be used as an information carrier.

For providing security through authentication

For the distribution of hidden information via newsgroups, bulletin boards, or simply by images on homepages.

8

Reversible Watermarking

As a special subset of fragile watermarking, reversible watermarking enables us to recover the image which is same as the original image pixel by pixel after the content is authenticated. This type of lossless recovery is compulsory in sensitive imagery applications like medical and military purposes.

How Reversible Watermarking ?

In the existing methods, the embedding

process is carried out in such a manner

that: some distortion is introduced.

Reversible data embedding provides :

DISTORTION FREE DATA EMBEDDING

Advantages of Reversible Watermarking

It can recover the image which is same as the original image pixel by pixel.

This technique provides the distortion free data embedding

Embedding capacity has been increased.

The reversible watermarking is blind i.e., no need of original image during extraction process

Designing of HDL

Why high pass coefficients ?

Computation of 1-D (5, 3) DWT Block in which ‘a’ and ‘b’ are lifting coefficients

(a = -1/2 and b = 1/4)

Watermark embedding stage

Register Register

Wm

Embed 1Bit

Wm

Embed 2Bits

Wm

Embed 3Bits

Wm_Enable

clock

watermark

q

a b c

Buff

er

I_Marked

0

1

Wm

Embed 4Bits

d

Register

Register Register Register

Payload

a

b

c

d

00

10

01

11

Simulation Result of Embedding of Watermark Bits

CONCLUSIONInstead of embedding watermark

directly in pixels of the image where the distortion is large, watermark bits are embedded in the high frequency coefficients and also the embedding capacity is increased.

Resources:Software Resources

MODELSIM SE