摘要
提出了一种基于Krawtchouk矩和小波变换的抵抗几何攻击的内容认证水印算法。该方法首先对图像进行一次小波分解,然后计算其低频成分的Krawtchouk低阶矩不变量来构建水印。水印提取过程简单,只需计算所得图像的几个低阶Krawtchouk矩不变量。文中给出了实验结果,并与Alghoniemy提出的基于几何矩不变量的数字水印算法进行了比较。结果表明,该方法简单、有效,对旋转、缩放、剪切、组合攻击等几何攻击以及JPEG压缩攻击具有更高的稳健性。
The watermark based on wavelet transform and Krawtchouk moments is used in an authentication context. After doing discrete wavelet transform （DWT）, the subband coefficients are extracted. Then, the lower order Krawtchouk moments of the subband coefficients are computed. The watermark is composed of the mean of several functions of the moments. The processing of the encoder and the decoder is simple, and a few lower order moments need to be calculated. Experimental results are compared with results of the method based on the geometric invariance presented by Alghoniemy. Results show that the scheme is simple, effective, and has high stabilities of geometrical attacks of rotation, scaling, shearing, combined attack, and JPEG lossy compression.
出处
《数据采集与处理》
CSCD
北大核心
2007年第3期321-325,共5页
Journal of Data Acquisition and Processing
