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- W2348504016 abstract "Digital watermark is invisible mark embedded in digital image, video or audio documents, which can be detected to protect copyright of multimedia data. The thesis describes a watermarking scheme based on CL multi-wavelets. After the CL multi-wavelet transformation of an image, most energy of the image is mainly concentrated on its lowest resolution sub-image. Moreover, most energy of the lowest resolution sub-image is further concentrated on its first component. Because lowest resolution sub-image can survive from some transformation such as compression, this scheme can improve robust of embedded watermark. But the invisibility of watermark is reduced at that time because of the sensitivity of the lowest resolution sub-image to HVS(Human Visual Model). The position to embed watermark is selected with a trade-off between robustness and invisibility. And preprocessing of the watermark image is here for declining the difference between the watermarked and original image. To deal with attack of counterfeit, it uses not additive method but replacement algorithm when embedding watermark. The correlation between the original and extracted watermark is computed to tell whether there exists watermark in the image. The performance of the proposed watermarking is invisible to HVS and robust to a variety of signal distortions, such as JPEG compression, filtering, cropping and incorporating attacks." @default.
- W2348504016 created "2016-06-24" @default.
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- W2348504016 date "2003-01-01" @default.
- W2348504016 modified "2023-09-26" @default.
- W2348504016 title "Watermarking Based on CL Multi-wavelet" @default.
- W2348504016 hasPublicationYear "2003" @default.
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