Authors:
Anastasios L. Kesidis
and
Basilios Gatos
Affiliation:
Computational Intelligence Laboratory, Institute of Informatics and Telecomunications, National Center for Scientific Research “Demokritos”", Greece
Keyword(s):
Image watermarking, invisible watermark, blind watermarking, pseudorandom noise sequences, geometric distortions, attacks, data hiding, information embedding.
Related
Ontology
Subjects/Areas/Topics:
Computer Vision, Visualization and Computer Graphics
;
Enhancement and Restoration
;
Image Filtering
;
Image Formation and Preprocessing
;
Image Quality
Abstract:
In this paper a watermarking scheme is presented that embeds the watermark message in randomly chosen coefficients along a ring in the frequency domain using non maximal pseudorandom sequences. The proposed method determines the longest possible sequence that corresponds to each watermark bit for a given number of available coefficients. Furthermore, an extra parameter is introduced that controls the robustness versus security performance of the encoding process. This parameter defines the size of a subset of available coefficients in the transform domain which are used for watermark embedding. Experimental results show that the method is robust to a variety of image processing operations and geometric transformations.