基于汉明码的数字水印隐藏方法

The Method of the Embedding of the Digit Watermarking Based on Hamming Code

与二值图像相比灰度图像具有丰富的信息。文章把灰度图像作为数字水印,提出利用函数的凹凸性来嵌入数字水印。当水印为1时,调整宿主图像DCT域三个中频系数使其函数图像形状向下凹,当数字水印为0时,调整宿主图像DCT域三个中频系数使其函数图像形状向上凸。为了减少误码,该文也引进了汉明码,来校正误码。实验证明,这种方法对高斯噪声有一定的鲁棒性,对椒盐噪声有很强的鲁棒性。

Gray scale image have more information than the binary image.In this paper,gray scale image is looked as digit watermarking.the pixel of the watermarking is embedded into the host image by the property of the concave and protruding of the function.When the value of the pixel of the watermarking is one,the values of the three of those middle frequency coefficient are adjusted to make the shape of the function concave.When the value of the pixel of the watermarking is zero,the values of the three of those middle frequency coefficient are adjusted to make the shape of the function protruding.In order to reduce the wrong code,the hamming code is used to correct the wrong code.It is turned out that it is robust to gauss noise and more robust to the salt and pepper noise.