采用小波变换方法的彩色图像水印方案

HVS-based color image watermarking scheme

提出了一种基于离散小波变换的彩色图像水印方案.首先估计彩色图像的视觉临界形变,然后利用均值量化的方法将水印分别嵌入到彩色图像亮度分量和色度分量的小波系数中.水印嵌入的强度随着不同区域视觉临界形变的变化而不同,水印的提取不需要载体图像.仿真结果表明,该水印方案能够抵抗常见的图像处理攻击,并且水印的嵌入不降低载体图像的视觉质量.

This paper presents a color image watermarking scheme based on the discrete wavelet transform （DWT）. Firstly, the just noticeable distortion of a color image was estimated. Then, the technique of meanquantization was employed to embed a watermark into the wavelet coefficients of the luminance component and color components of the color image respectively. The watermarking strength varied with the change of the just noticeable distortion in different regions. The cover image was not needed during the watermark extraction process. The simulation results show that this watermarking scheme can resist common image processing attacks, and the watermark embedding does not degrade the visual quality of the cover image.