Type of Document	Master's Thesis
Author	Mandhani, Navneet Kumar
Author's Email Address	nmandh1@lsu.edu, nmandhani@yahoo.com
URN	etd-07072004-112736
Title	Watermarking Using Decimal Sequences
Degree	Master of Science in Electrical Engineering (M.S.E.E.)
Department	Electrical & Computer Engineering
Advisory Committee	Advisor Name Title Subhash C. Kak Committee Chair Suresh Rai Committee Member Xue Bin Liang Committee Member
Keywords	digital watermarking robustness images d-sequences
Date of Defense	2004-06-09
Availability	unrestricted
Abstract 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.
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