中文摘要：

数字信号处理和计算机网络技术的迅猛发展，使得数字产品的版权保护问题面临极为严峻的挑战。数字水印技术主要是通过在数字产品中隐藏某些数字信息而达到数据的版权保护和内容认证。本文提出一种新的彩色图像防拷贝水印算法，算法选择彩色图像YUV空间，对色度分量进行离散余弦变换与二值化获得唯一描述图像的特征信息，经过混沌加密后嵌入到亮度分量小波变换系数的中频部分，同时，该算法能够实现盲提取。实验结果表明，该算法对噪声攻击、JPEG压缩、滤波和剪切等攻击具有较好的鲁棒性，同时能够有效地抵抗拷贝攻击。

英文摘要：

The rapid developments of digital signal processing and internet techniques have threatened the copyright protect of the digital productions severely. Digital watermarking can realize the copyright protection and authentication for the digital data by hiding some digital information in them. In this paper, a novel watermarking algorithm for color image resistant to copy attack is proposed. The method adopted YUV color space and the feature describing the original image uniquely is attained by DCT and binarization from the ehroma component. After being scrambled by chaotic sequences, the feature is embedded into the middle frequency coefficients of luminance components of the color image by using DWT. The extracting does not need the original image, namely a blind watermarking algorithm. The simulations show that the scheme can effectively resist not only common image processing such as noise, JPEG compression, filtering, cropping, etc, but also copy attack.