基于YC_bC_r颜色空间的二维DCT彩色图像数字水印实用技术  

2-Dimension Color Image Digital Watermarking Technique Based on YC_bC_r Color Space

作　　者：凌贺飞[1] 卢正鼎[1] 杨双远[1] 

机构地区：[1]华中科技大学计算机科学与技术学院,湖北武汉430074

出　　处：《小型微型计算机系统》2005年第3期482-484,共3页Journal of Chinese Computer Systems

基　　金：国家"十五"重点科技攻关项目(2002BA103A04)资助.

摘　　要：作为版权保护的重要手段,数字水印技术已得到广泛的研究和应用,但是实用的彩色图像数字水印技术不多,特别是灰度级水印信号的嵌入算法不多.文中充分考虑到人类视觉系统特点,采用YC_bC_r彩色空间,将灰度图像水印信号嵌入载体的亮度分量Y的DCT系数中.灰度图像的嵌入策略是采用整体DCT,排除DC系数和部分低频系数,而将水印信号嵌入载体第100到100+N之间的中低频系数通道中.实验证明,该算法能够对剪切、旋转、翻转、比例缩放和平移等几何变换有较强的免疫力,同时对压缩、滤波和噪声污染等常见的信号处理也具有较强的免疫力.As a main method for copyright protection, the techniques of watermarking have been widely researched and applied. But there are few methods of practical color image digital watermarking, especially in the case of embedding a grayscale image into a color image. Considering the characteristic of Human Visual System(HVS), the method adopted YC_bC_r color space and embedded a grayscale image into the luminance Y of the color image by using discrete cosine transform. The embedded channels are the low or middle frequency channels whose DCT coefficients are from the 100th to (100+N) th maximum. The experimental results show that the scheme works really well, the embedded watermark is effectively robust against various image processing operations such as cropping, rotation, flipping, scaling, shift, JPEG lossy compression, filtering, noise, etc.

关 键 词：数字水印 YCBCR颜色空间 离散余弦变换 彩色图像 

分 类 号：TP309.2[自动化与计算机技术—计算机系统结构]