WSEAS Transactions on Systems
Print ISSN: 1109-2777, E-ISSN: 2224-2678
Volume 13, 2014
Special Issue: Multi-models for Complex Technological Systems Editors: C. Ciufudean, F. Neri CAM-based Digital Image Watermarking Revisited
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Abstract: The Content Addressable Method (CAM) is used in a new RGB image watermarking system. The image is divided into clusters indexed by CAM technique. Each cluster holds part of the watermark in sequence. A cluster is segmented into equal portions each of them is used to duplicate a number of bits of the watermark. These portions are numerated by a counter added to some LSB bits of the pixels. We used two techniques for this segmentation. In the first technique, the cluster’s pixels are allocated to a portion in a first visited first allocated FVFA way. The counter is added to portions in sequence. In second technique, a Content Based Counter CBC is used to allocate pixels to the portion and a uniform redistribution is made for each cluster. The redistribution is done in a way to minimize the modifications in counter space. Both techniques show robustness resisting to rotation attacks. The CBC performs better as it minimizes the Number of Bit Change Rate (NBCR) in the counter field. Using CBC our watermarking system resists better to cropping attacks.
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Keywords: Watermarking, image rotation, clustering, color images, Content Addressable Method, Content Based Counter
Pages: 510-519
WSEAS Transactions on Systems, ISSN / E-ISSN: 1109-2777 / 2224-2678, Volume 13, 2014, Art. #51