期刊名称：International Journal of Research and Innovation in Computer Engineering
电子版ISSN：2249-6580
出版年度：2012
卷号：2
期号：3
页码：274-279
出版社：Innovation Science Publications
摘要：To resolve the copyright problem of color image this paper proposes a watermarking scheme in B domain of color image using DWT-SVD (Discrete wavelet transform-singular value decomposition). The singular values of B channel of original image (RGB space) are modified using singular values of watermark. Low frequency sub-band coefficients (LL) are less robust to geometrical distortions and histogram equalization while highest frequency sub-bands (HH) are resistant to another group of attacks. So embedding the same watermark in all 4 sub-bands will make it extremely difficult to remove or destroy the watermark from all frequency sub-bands. Here we embed Watermark in all four sub-bands (LL, HL, LH and HH) to increase robustness and the combination of SVD with wavelet make algorithm more imperceptible. Set of image processing attacks are applied to watermarked image to check the performance of scheme. The comparison shows the proposed algorithm outperforms the conventional DWT scheme.
