基于对数变换的DWT-SVD域水印算法研究

提出了一种基于小波变换和奇异值分解的水印算法。首先将置乱加密后的图像无重叠地分成32×32子块，对各个子块进行小波变换和奇异值分解后，然后选择部分奇异值进行对数运算，最后依据水印信息位进行水印的嵌入。实验结果表明该算法既能保证水印的不可见性又拥有抗JPEG压缩的稳健性，对恶意篡改敏感，能够有效的将JPEG压缩与恶意篡改区分开来。

Research on DWT-SVD Domain Watermarking Algorithm Based on Log-transformed

Based on wavelet transform and singular value decomposition of the watermarking algorithm. Scrambling first encrypted image divided into non-overlapping 32 × 32 sub-block, for each sub-block to wavelet transform and singular value decomposition, the singular value and then select some number of operations carried out, and finally carried out in accordance with the watermark information embedded watermark . Experimental results show that the algorithm can ensure visibility of the watermark does not have anti-JPEG compression and the stability of malicious tampering with sensitive and effective will be able to JPEG compression and distinguish between malicious tampering.