一种基于DWT的彩色图像灰度级双肓水印算法

A Dual Blind Gray-level Digital Watermarking Algorithm for Color Image Based on DWT

提出了一种基于DWT的彩色图像双肓水印算法,首先将彩色图像转入YIQ空间,选择Y分量进行n级小波分解,并对n-1级的HL与LH子图进一步作1次小波分解。从分解后所得的各子带中选择视觉感知较为重要的系数组成两个待嵌入水印向量,实现了双灰度水印的嵌入。实验结果表明,该算法对于常见的图像处理具有良好的鲁棒性。

A dual blind gray-level digital watermarking algorithm for color image based on DWT is proposed.The color image is transformed into YIQ color space first,and the Y component is decomposed by n-level DWT,then the HL and LH of level n-1 is decomposed by 1-level DWT again.Some important perceptive coefficients are selected from the got sub-bands to form 2 vectors for embedding watermarks.At last,2 gray-level digital watermarks are embedded into them separately.The experimental results show the algorithm has good robustness against common image processing.