A Semi-Blind Reference Watermarking Scheme Using DWT-SVD for Copyright Protection

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Executive Summary

In this paper, the authors propose a semi-blind watermarking scheme using Discrete Wavelet Transform and Singular Value Decomposition for copyright protection. They used a gray scale image as a watermark to hide in another gray scale image as a cover image. The cover image is modified (Zig-Zag) and divided to number of blocks of size n x n. They find the spatial frequency of each block and kept a threshold on this spatial frequency to form a reference image.

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