本网站上下载的混沌加密的m代码，通过logistic映射生成了混沌序列并调制，实现了对水印信息的预处理。-The website of the chaotic encryption of m code, through the logistic chaotic sequence generated mapping and modulation to achieve a pre-processing of watermark information.

基于混沌加密的奇异值分解算法的源代码，实现了水印技术的预处理及嵌入提取过程。-Chaos-based encryption algorithm, singular value decomposition of the source code, a watermark embedding technology and extraction pretreatment.

matlab code in watermarking techniques