一种基于人类视觉系统的彩色图像水印算法

将彩色载体图像在YIQ空间的Y分量进行三级小波分解,将空域的水印信息的高低位分段处理,并用伪随机序列与水印信息各位分别异或进行加密,按照人类视觉特性分别以不同的权重嵌入载体图像的频域中.实验结果表明,在面对大信息量的彩色水印信息时,使用这种方法嵌入的水印信息具有良好的不可见性和安全性,同时鲁棒性良好,能够抵挡常见的滤波、剪切、加噪声及压缩等攻击方式.

Color image watermarking algorithm based on human visnal system

The luminance Y in YIQ mode of the host image was decomposed into 3 level wavelets by discrete wavelet tranfform,the watermark information was devided into several different frequency parts,and pseudo random sequence xor was used with each bit of the watermark information encrypted to embed the spatial domain information with different weight into the frequency domain of host image according to the human visual characteristics.Experimental results show that the color watermark embedded with the proposed method is of invisibility and security,and is robust against the common image processing such as filtering,cropping,noise addition,compression and so on.