针对数字产品的版权保护问题,利用二维离散整数小波变换的快速性,结合人类视觉系统特性,开发了一种基于彩色图像新的、简单的、鲁棒性盲水印嵌入系统.系统可以将水印信息嵌入到不同整数小波分解级数下的彩色载体图像中去,具有嵌入速度快、安全性高的特点.首先将彩色载体图像由RGB彩色空间转换到YUV空间,再对y分量进行多级整数小波分解,然后分别将有意义的二值图像和字符串作为水印嵌入到不同级数小波分解后的低频域(LLn).算法选择了合适的水印嵌入位置,实验结果证明:系统使图像的不可见性好,所嵌入的水印对一般的图像处理攻击,如噪声、滤波、旋转、压缩等有较强的鲁棒性,系统实用性较强.%Aimed at the insecurity of the digital products, one digital watermarking technique for color image was proposed,utilizing the speediness of two-dimensional discrete wavelet transforms that map integers to integers and combining characteristic of the human's optical system. Firstly, color image is converted from RGB space to YUV space and multilevel discrete integer wavelet transform was done to the Y frequency. Secondly, a meaning character string or binary image as a watermark is embedded into the low frequency part of the carrier image. This system chooses the appropriate position to embed the watermarking. The experimental results indicate that the system not only enables the watermarking to have the very good invisibility, but also makes the watermarking have very strong robustness to the general image attacks, such as noise, filter, rotation, compression and so on. The watermark technique has a strong practicability,little impress to the original carrier image,can resist JPEG compression.
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