Title page for ETD etd-07072004-112736


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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