The New Jersey Institute of Technology's
Electronic Theses & Dissertations Project

Title:	Detection and robustness of digital image watermarking signals : a communication theory approach
Author:	Elmasry, George F.
View Online:	njit-etd1999-029 (xxi, 186 pages ~ 10.4 MB pdf)
Department:	Department of Electrical and Computer Engineering
Degree:	Doctor of Philosophy
Program:	Electrical Engineering
Document Type:	Dissertation
Advisory Committee:	Shi, Yun Q. (Committee chair) Fang, Michael (Committee member) Frank, Joseph (Committee member) Manikopoulos, Constantine N. (Committee member) Siveski, Zoran (Committee member)
Date:	1999-08
Keywords:	Watermarks Image processing Digital techniques
Availability:	Unrestricted
Abstract:	The detection and robustness of the watermark signal is studied from a communications point of view. The contributions of this dissertation are presented in two parts. The first part, which covers the detection aspect, introduces a new digital image watermarking approach that embeds meaningful information in a copyright protection watermark signal; demonstrates the need to approach the watermark signal as a power-constrained signal; studies the relationship between the watermark signal dimension and the image capacity to the signal; explains the similarities and differences between detecting the watermark signal and detecting a signal over a spread-spectrum communication channel; and analyzes the application of sequence detection techniques (MAPSD and MLSD) to the watermark signal. The second part, which covers the robustness aspect, introduces a novel multidimensional interleaving algorithm that increases the signal's robustness against burst errors; presents, analyzes, and compares two techniques for implementing the algorithm (a sliding window technique and a successive partitioning technique); and demonstrates the increase in watermark signal robustness as a result of applying this multidimensional interleaving. This increase of the signal's robustness is shown in the 2-D case by applying the 2-D version of the interleaving algorithm to watermark signals embedded in still images (where the signal layout is in 2-D), and in the 3-D case by applying the 3-D version of the interleaving algorithm to watermark signals embedded in video sequences (where the signal layout is in 3-D).