Abstract
A new procedure for watermarking in the 88 block- based discrete cosine transform (DCT) domain (used for JPEG compression) is proposed. The influence of JPEG quantization on watermarked coefficients and on watermark is considered. The cri- terion for coefficients selection is derived, providing robustness for an arbitrary quantization degree. The modified form of coefficients probability density function (pdf) leads to the class of modified opti- mal detectors. Theoretical results are illustrated on various ex- amples. Efficiency of the proposed procedure is shown in the pres- ence of different quantization degrees, and other common attacks. © 2008 SPIE and IS&T. DOI: 10.1117/1.2981832
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