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A Wavelet-Based Watermarking Scheme of Digital Image Using ROI Method  

Kim, Tae-Jung (한국과학기술정보연구원)
Hong, Choong-Seon (경희대학교 전자정보학)
Sung, Ji-Hyun ((주)플래넷 기술연구)
Hwang, Jae-Ho (수원여자대학 전자상거래)
Lee, Dae-Young (경희대학교 전자정보학부)
General watermarking techniques tend not to consider intrinsic characteristics of image, so that watermarks are embeded to entire images. In this paper, we present a watermarking algorithm based on wavelet domain, and the watermark is embedded into large coefficients in region of interest(ROI) being based on principle of multi-threshold watermark coding(MTWC) for robust watermark insertion. We try to accomplish both image duality and robustness using human visual system(HVS). The watermarks are embedded in middle frequency bands because the distortion degree of watermarked images appears to be less than lower frequency bands, and the embedded watermarks in the middle bands showed high extraction ratios after some distortion. The watermarks are consisted of pseudo random sequences and detected using Cox's similarity mesurement.
Watermarking; Multi-Threshold Watermark Coding(MTWC); Human Visual System(HVS);
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