基于混沌加密和离散小波变换的数字图像水印算法

Digital image watermarking algorithm based on chaotic encryption and DWT

数字水印是保护数字产品版权的有效办法。首先阐述了一种传统的数字水印算法,该算法将数字水印小波分解后,嵌入到原始载体图像第三级小波子带,实现水印的嵌入;然后详细介绍了混沌加密以及离散小波变换的原理;最后,设计了一种结合混沌加密和水印嵌入的图像水印算法。仿真验证结果表明,该算法对于水印的嵌入和提取有较好的效果,能够从嵌入水印的原始图像中获得正确的图像内容,并且满足了不可见水印的要求。

Digital watermarking is an effective method to protect the copyright of digital products.This paper introduces a kind of traditional digital watermarking algorithm which divides the digital watermark wavelet and embeds it into the third level wavelet of the original carrier image to realize the embedding of watermark.This paper also introduces in detail the principle of the chaos encryption and discrete wavelet transform.Finally,an image watermarking algorithm is designed,which combines chaos encryption with watermark embedding.The simulation results show that this algorithm has better effect for the watermark embedding and extraction.The algorithm can obtain the correct image content from the original image watermark embedding and meet the requirements of the invisible watermark.