Digital watermarking algorithm based on DWT and SVD
Zhou Peng-ying, Lei Shen, Xiaolin Tian, Xia Shao-wei · Jisuanji yingyong yanjiu · 2010
To protect copyrights of digital products effectively, proposed a new scheme of digital image watermarking based on the combination of discrete wavelet transformation (DWT) and singular value decomposition(SVD). The algorithm used DWT and SVD inherent characteristic fully, and decomposed the original image to the subbands of multi-DWT, then applied SVD to transform some of subbands. The Arnold transformation could increase the security of watermark, and decomposed the gray-level watermark image with blocked-DCT transform after being Arnold scrambled. Then classified DCT coefficients and inserted into the middle of third level of SVD of original image. The experimental based on this algorithm demonstrates that the watermark is invisible, and it is robust to the common signal processing technology.