Wavelet based Image Watermarking
The digital watermark technology is now drawing attention as a useful method of protecting copyrights of digital contents such as audio, image, and video. Especially, efficient image watermarking methods have been developed in the DWT (discrete wavelet transform) domain. In the wavelet-based watermarking, similar to the wavelet-based coding, the choice of wavelet filter banks generally affects the performance ofwatermarking methods.
Hence a natural question arises for the wavelet-based watermarking: what is the best wavelet filter bank for use? In this paper, we evaluate wavelet filter banks used in watermarking theoretically from the viewpoint of the quality of watermarked image and the robustness of watermark, and then try to answer the ‘best wavelet filter bank’ problem for the wavelet-based watermarking.
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