基于小波变换的一种数字水印隐藏方法

提出用水印的象素去控制宿主图像小波变换后的系数的值,即用水印中的一个象素控制宿主图像小波变换后的其中四个数中的两个数,使其四个数的均值靠近其中的最小的或者是最大的数.提取水印时通过检测这四个数的平均值离最大数和最小数的距离来判断是1还是0.实验结果表明,这种方法嵌入的水印是不可见的,而且对椒盐和高斯噪声具有一定的鲁棒性.

A Way Based on the Wavelet of the Hiding the Watermarking

In this paper, the new method is proposed. The one of the pixel of the watermarking is used to control the four coefficients of the host image transformed with the wavelet and makes the mean of the four coefficients close to the maximum or the minimum. When extracting the watermarking, it is judged by the distance to the maximum and the minimum.When the mean is close to the maximum, the value of the pixel of the watermarking is one. Vice versa, it is turned out that the watermarking embedding in this way is invisible and robust to the salt and pepper noise and Gaussian noise.