Technical Seminar Presentation-2004 Presented by : ASHOK KUMAR SAHOO (EI ) NATIONAL INSTITUTE OF SCIENCE & TECHNOLOGY Presented By Ashok Kumar Sahoo Roll # EI DIGITAL WATERMARKIG IN SPATIAL DOMAIN Under the guidance of Mr. S. K. Meher 1

Technical Seminar Presentation-2004 Presented by : ASHOK KUMAR SAHOO (EI ) NATIONAL INSTITUTE OF SCIENCE & TECHNOLOGY OUTLINE Introduction Methods New Image Watermarking Algorithm Experimental Results Future Direction Conclusion 2

Technical Seminar Presentation-2004 Presented by : ASHOK KUMAR SAHOO (EI ) NATIONAL INSTITUTE OF SCIENCE & TECHNOLOGY 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 Watermarking Algorithm Watermarked Image Ì Host-Image I Watermark W Secret / public key K 3

Technical Seminar Presentation-2004 Presented by : ASHOK KUMAR SAHOO (EI ) NATIONAL INSTITUTE OF SCIENCE & TECHNOLOGY 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; 4

Technical Seminar Presentation-2004 Presented by : ASHOK KUMAR SAHOO (EI ) NATIONAL INSTITUTE OF SCIENCE & TECHNOLOGY 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 5

Technical Seminar Presentation-2004 Presented by : ASHOK KUMAR SAHOO (EI ) NATIONAL INSTITUTE OF SCIENCE & TECHNOLOGY HOW IT WORKS 6

Technical Seminar Presentation-2004 Presented by : ASHOK KUMAR SAHOO (EI ) NATIONAL INSTITUTE OF SCIENCE & TECHNOLOGY TECHNICAL REQUIRMENTS Robustness Capacity Invisibility 7

Technical Seminar Presentation-2004 Presented by : ASHOK KUMAR SAHOO (EI ) NATIONAL INSTITUTE OF SCIENCE & TECHNOLOGY Digital watermarking techniques can be divided into two broad categories: 1.Spatial domain methods. 2 Frequency domain methods. METHODS FOR DIGITAL WATERMARKING 8

Technical Seminar Presentation-2004 Presented by : ASHOK KUMAR SAHOO (EI ) NATIONAL INSTITUTE OF SCIENCE & TECHNOLOGY 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)] 9

Technical Seminar Presentation-2004 Presented by : ASHOK KUMAR SAHOO (EI ) NATIONAL INSTITUTE OF SCIENCE & TECHNOLOGY ATTACKS ON WATERMAKING Compression Rescaling Processing operation Cropping Multiple watermarks 10

Technical Seminar Presentation-2004 Presented by : ASHOK KUMAR SAHOO (EI ) NATIONAL INSTITUTE OF SCIENCE & TECHNOLOGY THE PROPOSED MODEL 11

Technical Seminar Presentation-2004 Presented by : ASHOK KUMAR SAHOO (EI ) NATIONAL INSTITUTE OF SCIENCE & TECHNOLOGY EMBEDDING WATERMARK 12

Technical Seminar Presentation-2004 Presented by : ASHOK KUMAR SAHOO (EI ) NATIONAL INSTITUTE OF SCIENCE & TECHNOLOGY WATERMARK DETECTION b=1 if Snew>So, b=0 Otherwise. 13

Technical Seminar Presentation-2004 Presented by : ASHOK KUMAR SAHOO (EI ) NATIONAL INSTITUTE OF SCIENCE & TECHNOLOGY EXPERIMENT RESULT The proposed algorithm was implemented using Matlab where the watermark is extracted after compression attack. Results 14

Technical Seminar Presentation-2004 Presented by : ASHOK KUMAR SAHOO (EI ) NATIONAL INSTITUTE OF SCIENCE & TECHNOLOGY EVALUATION A simple watermarking scheme Invisibility Resist to lossy compression Watermark is invisible even though the picture in binary format. 15

Technical Seminar Presentation-2004 Presented by : ASHOK KUMAR SAHOO (EI ) NATIONAL INSTITUTE OF SCIENCE & TECHNOLOGY 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 16

Technical Seminar Presentation-2004 Presented by : ASHOK KUMAR SAHOO (EI ) NATIONAL INSTITUTE OF SCIENCE & TECHNOLOGY 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 17

Technical Seminar Presentation-2004 Presented by : ASHOK KUMAR SAHOO (EI ) NATIONAL INSTITUTE OF SCIENCE & TECHNOLOGY 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 18

Technical Seminar Presentation-2004 Presented by : ASHOK KUMAR SAHOO (EI ) NATIONAL INSTITUTE OF SCIENCE & TECHNOLOGY THANK YOU!!!! 19

Technical Seminar Presentation-2004 Presented by : ASHOK KUMAR SAHOO (EI ) NATIONAL INSTITUTE OF SCIENCE & TECHNOLOGY