A ROBUST DIGITAL IMAGE WATERMARKING METHOD BASED ON SINGULAR VALUE DECOMPOSITION AND DISCRETE COSINE TRANSFORM(INTERNATIONAL Workshop on Advanced Image Technology 2008)

概要

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This paper presents a digital image watermarking method that combines singular value decomposition (SVD) and discrete cosine transform (DCT). Digital watermarking has been used to realize information data hiding and to protect copyright of digital contents. However, the watermark embedded in an original image is sometimes broken by various attacks such as geometrical transformations or noise additions. In order to improve robustness of our watermarking method, we embed only the bigger singular values of a watermark into DCT components of sub-blocks of the original image. By preserving normalized eigenvectors suitably rounded, our method can tolerate resizing, cropping, and other attacks and the embedded watermark can be easily extracted from the attacked image. Experimental results show that our method is robust and effective.
社団法人電子情報通信学会の論文
2007-12-31