基于多通道HVS和DWT—DCT相结合的彩色图像水印算法

摘要

A blind watermarking algorithm for digital image based on DCT and DWT is proposed. First, the original image is transformed from the RGB color space into the YCbCr color space, which has the excel- lent independence of every channel, then the watermark is embedded into all three color spaces. Secondly, the watermark embedding position was chosen by human visual system （ HVS）, and the embedding of water- marking is achieved by the algorithm of image watermark technique on DCT and DWT, and the capacity of embedding depends on human visual system. The experimental result indicates that the algorithm is visually imperceptible and robust to general image processing.%随着计算机和网络的飞速发展，流通信息的版权保护问题越来越受到人们的重视，数字水印作为一种有效的版权保护方法已经得到了广泛的应用．本文提出了一种基于小波中频和DCT相结合的彩色盲水印算法，首先将彩色图像由RGB彩色空间转换至13YCbCr彩色空间，弄13用其良好的空阃独立性，基于人眼视觉掩蔽效应选择嵌入位置，然后分别通过将原图像DWT中频系数作分块DCT变换，嵌入水印．实验结果表明，嵌入算法容易实现，且该水印算法具有很好的不可见性，并对剪切和JPEG压缩等图像操作都有很好的鲁棒性．