基于整数小波变换的灰度图像水印技术

数字水印技术通过在媒体图像中隐藏信号来达到保护媒体版权的作用。论文提出一种针对灰度图像水印的,基于整数小波提升算法的水印技术。该方法在对原始图像分块的基础上进行整数小波提升变换,然后对灰度水印图像置乱,再进行位平面分解,最后将每一个位面的水印信息都嵌入到原始图像的小波变换系数中。实验结果表明,该方法能较好地抵抗剪切和JPEG压缩攻击,对于滤波及噪声干扰也有一定的鲁棒性。

Digital Watermarking Technique for Grayscale Images Based on Integer Wavelet Transform

Digital watermarking technique has been presented as a new method for copyright protection by embedding a secrete signal in a media image.A digital watermarking technique based on integer wavelet lifting scheme (IWLS)is pro-posed.The method is for grayscale images watermark.First of all,the original image is divided into blocks,then,the IWLS is applied to these blocks respectively.At the same time ,the grayscale image watermark is scrambled,and then decom-posed into eight binary bit-planes.At last,these binary bit-planes are embedded into the coefficients of wavelet trans-form of the original image.Experimental results show that the proposed technique is robust to cropping and JPEG com-pression attacks,and to some extent ,can provide protection under filtering and noise attacks.