两种数字水印算法的比较

分别介绍迭加水印方案和量化水印方案，对每种方案一些常见算法予以说明，阐明其优缺点，对两种水印方案的相同点和不同点进行了研究。通过实验证明，两种水印方案的PSNR比较相似：迭加水印检测的相关值分布比较扩散，受高斯影响大；量化水印检测的相关值比较稳定，受高斯噪声的影响小。

The Comparison between Two Digital Watermaking Algorithms

Superposition watermarking scheme and quantization watermarking scheme are introduced in this paper. For each scheme , some common algorithms are illustrated, and advantages and disadvantages and the similarities and differences between them are also discussed. The experimental results show that the PSNR of two kinds of watermarking scheme is similar, the correlation value distribution of superposition watermark detection is spread and is easily influenced by Gaussian noise. On the other hand, the correlation value distribution of quantization watermarking is stable and is hardly influenced by Gaussian noise.