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http://dx.doi.org/10.3745/KIPSTB.2005.12B.7.729

Watermarking Using Multiresolution Wavelet Transform and Image Fusion  

Kim Dong-Hyun (경희대학교 대학원 전자공학과)
Jun Kye-Suk (경희대학교 전자정보대학)
Lee Dae-Young (경희대학교 전자정보대학)
Abstract
In this paper. the proposed method for the digital watermarking is based on the multiresolution wavelet transform. The 1-level Discrete Wavelet Transform(DWT) coefficients of a $2N_{wx}{\times}2N_{wy}$ binary logo image used as a watermarks. The LL band and middle frequency band of the host image that the 3-level DWT has been performed are divided into $N_{wx}{\times}N_{wy}$ size and we use large coefficients at the divided blocks to make threshold. we set the thresholds that completely insert the watermark in each frequency of the host image. The thresholds in each frequency of the host image differ each other. The watermarks where is the same positions are added to the larger coefficients than threshold in the blocks at LL band and middle frequency band in order to prevent the quality deterioration of the host image. The watermarks are inserted in LL band and middle frequency band of the host image. In order to be invisibility of the watermark, the Human Visual System(HVS) is applied to the watermark. We prove the proper embedding method by experiment. We rapidly detect the watermark using this watermarking method. And because the small size watermarks are inserted by HVS, the results confirm the superiority of the proposed method on invisibility and robustness.
Keywords
Digital Watermark; Discrete Wavelet Transform; Human Visual System; mage Processing; Image Fusion;
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