基于混沌映射和离散变换的零水印算法

Zero-Watermark Algorithm Based on Chaotic Map and Discrete Transform

提出了一种基于混沌映射和小波变换的零水印算法.该算法将原始图像进行小波变换后,取其低频子带的小波系数作logistic映射,将得到的结果处理成一维数组作为提取水印图像的依据,并进行了Arnold变换和加密处理,因而保证了水印信息的安全性.

A zero-watermark algorithm based on chaotic map and discrete transfrom was proposed.After the wavelet transformation from the original image,its low frequency sub-band wavelet coefficients were selected to make the logistic mapping and the results abtained were processed into ID arrays as the basis for extracting the watermarking image,and the Arnold transformation and encryption were also conducted,so that the security of watermarking information was ensured.