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¢ DIGITAL WATERMARKIG IN SPATIAL DOMAIN
¢

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Presented By
¢ Ashok Kumar Sahoo Roll # EI 200118123

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¢ OUTLINE
¢ Introduction
¢ Methods
¢ New Image Watermarking Algorithm
¢ Experimental Results
¢ Future Direction
¢ Conclusion


¢ INTRODUCTION
¢ Watermarking is a concept of embedding a special pattern, watermark, into a document
¢ Watermarking is a key process for the protection of copyright ownership of electronic data



¢ INTRODUCTION
¢ An existing scheme for still image watermarking in spatial domain is studied.
¢ The features of the algorithm are:
“ The watermark to be embedded is a visually meaningful binary image;
“ More resistant to any attack;
“ retrieval of embedded watermark is easy;
“ the watermark is perceptually invisible;



¢ WHY DIGITAL WATERMARKING
¢ Cryptography ensures confidentiality, authenticity, and integrity
¢ It cannot help after decryption
¢ Digital Watermarking can help
“ Prove ownership
“ Identify a misappropriating person
“ Trace the marked document™s dissemination through the network
¢ HOW IT WORKS
¢ TECHNICAL REQUIRMENTS


¢ METHODS FOR DIGITAL WATERMARKING
¢ Digital watermarking techniques can be divided into two broad categories:
¢ 1.Spatial domain methods .
¢ 2 Frequency domain methods.


¢ SPATIAL DOMAIN METHODS
¢ The term spatial domain refers to the aggregate of pixels composing an image. Spatial domain methods are procedures that operate directly on these pixels. Spatial Domain processes will be denoted by the expression ,
g(x,y)= T[f(x,y)]



¢ ATTACKS ON WATERMAKING
¢ Compression
¢ Rescaling
¢ Processing operation
¢ Cropping
¢ Multiple watermarks
¢ THE PROPOSED MODEL
¢ EMBEDDING WATERMARK
¢ WATERMARK DETECTION
¢ b=1 if Snew >So,
¢ b=0 Otherwise.



¢ EXPERIMENT RESULT
¢ The proposed algorithm was implemented using Matlab where the watermark is extracted after compression attack.
¢ Results



¢ EVALUATION
¢ A simple watermarking scheme
¢ Invisibility
¢ Resist to lossy compression
¢ Watermark is invisible even though the picture in binary format.



¢ APPLICATIONS
¢ Copyright defense
¢ Three types of watermark
i) Private-key
ii) Detection-key
iii) Public-key
¢ Trace the route of the certain files during distribution


¢ FUTURE DIRECTION
¢ Increase robustness against lossy compression
¢ Use better quad tree decomposition coding
¢ Change the way to insert key.
¢ Encode the watermark before embedding.
¢ Extend the watermark techniques to wireless environment


¢ CONCLUSION
¢ Video Watermarking is needed since copyright protection is essential
¢ Watermarking in spatial domain is different from frequency domain.
¢ Spatial domain watermarking model is proposed and implemented
¢ Watermark is embedded in MSB to increase the efficiency
THANK YOU!!!!