一种基于离散小波变换和HVS的彩色图像数字水印技术

A Digital Watermarking Technique for Color Images Based on DWT and HVS

提出了一种将彩色数字水印嵌入到原始彩色数字图像中的算法，通过将水印多次嵌入到DWT后相应的频段来增强鲁棒性；该算法利用了HVS(Human Visual System)特性，并通过实验得出了水印不同彩色分量(R、G、B)的加权系数，从而使嵌入水印后的图像无主观视觉上的失真。通过实验验证，该算法在对嵌入水印后的图像进行JPEG有损压缩、剪切、不规则色块污染、添加各种噪声处理后，提取出的水印表现出了较好的鲁棒性，且主观视觉失真较小。

This paper presents a technique by embedding a color digital watermark into an original color image. Through inserting watermarks time after time into different frequency bands after DWT to enhance robustness. At the same time, the method utilizes the HVS peculiarity, obtains corresponding R、G、B strengthen coefficients from several experiments, in order to reduce the visual distortion in the result image. The method has been tested with attacks such as JPEG lossy compression, cropping, polluting and noise adding, obtaining results of good robustness and low visual distortion.