期刊名称：International Journal of Computer Science & Information Technology (IJCSIT)
印刷版ISSN：0975-4660
电子版ISSN：0975-3826
出版年度：2012
卷号：4
期号：2
页码：69
出版社：Academy & Industry Research Collaboration Center (AIRCC)
摘要：In this paper we propose a semi-blind watermarking scheme using Discrete Wavelet Transform,Discrete Cosine Transform and Singular Value Decomposition for copyright protection. We used a grayscale image as a watermark to hide in another gray scale image as a cover image. The cover image ismodified (Zig-Zag) and divided to number of blocks of size n x n. We find the spatial frequency of eachblock and kept a threshold on this spatial frequency to form a reference image. Then the reference imageis transformed into wavelet domain. A DCT is applied to the HF band of DWT decomposition referenceimage. We hide the watermark into reference image by modifying the singular values of transformedDCT coefficients with the singular values of watermark. The proposed algorithm provides a goodimperceptibility and robust for various attacks.
