结合人眼对比度敏感视觉特性和图像变换域特征, 提出了一种新的人眼感知图像误差阈值的计算方法; 结合计算的阈值, 提出了一种新的彩色图像水印方案, 并进行了仿真实验和攻击测试; 实验结果表明, 含水印图像经攻击后提取的水印信息仍清晰可见, 其相似度值在压缩质量因子为50%的压缩攻击下仍能达到0.7371以上, 表明提出的水印方案具有较好的透明性和较高的鲁棒性; 并且在水印嵌入和提取过程中将原始彩色图像变换到与设备无关的CIELAB颜色空间, 从而更好的提高了水印的鲁棒性。综合结果表明提出的水印方案是一种行之有效的水印嵌入和提取方案。

Combined with contrast sensitivity characteristics of human vision system and image feature in transform domain, a new method is proposed for calculating the human perception error threshold of image. Combining the calculated threshold, a new color image watermarking scheme is brought forward, and the attack test and simulation experiments are carried out. The results show that, watermark information extracted from attacked images embedded watermark is still visible, the normalized coefficient values after compression attack with the compression quality factor 50% still can reach more than 0.7371, which shows that watermarking scheme proposed has good transparency and high robust. And in the watermark embedding and extraction process, the original color image is transform into the device-independent CIELAB color space in order to improve the robustness of the watermark. Synthesis results show that the proposed watermarking scheme is an effective watermark embedding and extraction scheme.