A Semi Fragile Watermarking Algorithm Based on SVD-IWT for Image Authentication

A semi fragile watermarking algorithm based on image scrambling and SVD in the wavelet domain has been presented in this paper. In the proposed algorithm, chaotic signals are generated using logistic mapping and are used for scrambling the original watermark. The initial values of logistic mapping are taken as private keys. The covert image is decomposed into four sub bands using integer wavelet transform; we apply SVD to each sub band, embed the scrambled watermark data by modifying the singular values. Modification in all frequencies allows the development of a robust watermarking scheme that is robust to a wide range of attacks. Keywords— logistic mapping, Singular value Decomposition, Integer wavelet transform, Image authentication,

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