Robust digital watermark algorithm in Contourlet domain based on singular value decomposition
基于奇异值分解的Contourlet域稳健性数字水印算法*

To protect the copyright of digital media, this paper proposed a digital watermark algorithm in Contourlet domain. The original image was decomposed with Contourlet transformation(CT), the scrambled watermark image was decomposed with singular value decompositino(SVD), then, the singular values of watermark image were used to modulate the chosen Contourlet coefficient matrixs. After inverse transformation, obtained a watermarked image. In watermark detection, only the SVD vector of the original image was needed, which meant the blind detection was nearly achieved. Finally, applied a series attacks, the results show that compared with traditional watermark algorithm in wavelet domain, the proposed method achieves great impovement in both invisibility and robustness.