DWT-SVD based adaptive color image watermarking
基于DWT-SVD域的彩色图像自适应水印算法

This paper proposed a color image adaptive watermarking algorithm combined DWT and SVD for copyright protection of digital color image. Firstly decomposing the color component of the original RGB color image using discrete wavelet transform respectively, it applied the SVD to HL, LL band and the watermarking alone, then embedded the same watermarking data into three channel by modifying the two band's singular values. The additional advantage of the proposed technique was taking advantage of the relationship between HVS and JND which could adaptively regulate the watermark embedding strength, so as to achieve the purpose of enhance the robustness and ensure transparency of watermark. The algorithm was suitable for binary and grayscale watermark, an extraction threshold value should be set in the binary watermark extraction process, to ensure the integrity of the extracted watermark. Simulation results show this algorithm is a more robust algorithm and better coordination the transparency and robustness of the watermarking system.