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A Novel Semi-Blind Reference Color Image Watermarking Using DWT-DCT-SVD

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Executive Summary

In this paper, the authors propose three robust and semi-blind digital color image watermarking algorithms. These algorithms are based on hybrid transforms using the combination of Discrete Cosine Transform (DCT) and Singular Value Decomposition (SVD), Discrete Wavelet Transform (DWT) and Singular Value Decomposition (SVD), Discrete Wavelet Transform (DWT), Discrete Cosine Transform (DCT) and Singular Value Decomposition (SVD). The original color image is divided to number of blocks. They calculate the spatial frequency of each block. They kept a threshold on this spatial frequency and from this they form a reference image. In the first algorithm they apply DCT on reference image. The singular values of the applied DCT coefficients and singular values of watermark are modified. In the second algorithm they apply DWT on reference image.

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