Watermarking Using Decimal Sequences

This paper introduces the use of decimal sequences in a code division multiple access (CDMA) based watermarking system to hide information for authentication in black and white images. Matlab version 6.5 was used to implement the algorithms discussed in this paper. The advantage of using d-sequences over PN sequences is that one can choose from a variety of prime numbers which provides a more flexible system.Comment: 8 pages, 9 figure

Watermarking using decimal sequences

This thesis introduces the use of decimal sequences in watermarking to hide information for authentication. The underlying system is based on code division multiple access (CDMA), which is a form of spread spectrum communication. Different algorithms for the use of decimal sequences have been formulated for use in black and white images. The watermark is spread across the carrier image by using the d- sequences of optimal period and retrieval is made by the use of correlation. Matlab version 6.5 was used to implement the algorithms discussed in this thesis. The advantage of using d-sequences over PN sequences is that one can choose from a variety of prime numbers which provides a more flexible system. Different methods for adding the random sequence to the image were investigated and results for random shifts and cyclic shifts have also been discussed

Acknowledgements

I would like to acknowledge certain people who have encouraged, supported and helped me complete my thesis at LSU. I am very grateful to my advisor Dr. Subhash C. Kak for his guidance, patience and understanding throughout this work. His suggestions, discussions and constant encouragement have helped me to get a deep insight in the field of Watermarking. I would like to thank Dr. Suresh Rai and Dr. Xue Bin Liang for sparing their time to be a part of my thesis advisory committee. I am very thankful to Dr. Stevan G. Hall for all his support, financial and technical throughout my thesis. I take this opportunity to thank my friends Archit, Pradeep, Naveed, Sameer, Radhika and Pallavi for their help and encouragement. I would also like to thank all my friends here who made my stay at LSU an enjoyable and a memorable one. i