一种新的基于混沌映射置乱和小波变换的数字水印算法

A New Digital Watermarking Technique Based on Chaotic Map Scrambling Transformation and Wavelet Transform

数字水印技术作为数字产品版权保护的一项新技术，已经受到了越来越多的关注。本文在保证水印的隐蔽性和鲁棒性的前提下，提出了一种基于混沌映射的图像置乱方法，并结合最新的JPEG2000压缩标准和HVS模型，采用自适应的量化技术，提出了一种新颖的水印嵌入算法。利用数据结构中的完全二叉树遍历序列和混沌映射对水印信息进行置乱和加密．再利用小波分解算法将水印信号以不同强度嵌入到从低分辨率到高分辨率的各个子带中对图像视觉影响较小的小波系数里面。实验表明．该算法对常见的数字图像处理和噪声干扰及恶意攻击，具有良好的顽健性。

As a new technique applied to protecting the copyright of digital productions, the digital watermark technique has drawn extensive attentions. In this paper, in order to ensure the concealment and robustness of watermqark,a new image scrambling algorithm based on chaotic map was proposed. The paper combining the new JPEG2000 compressing standard and the human visual masking model, using the adaptive quantization technique , introduce a new watermarking algorithm. The paper using the complete binary tree traversal sequence and chaotic map method to scrambling and eneryption to the watermarking information. The, According to the characteristics of the muhiresolution decomposition of the wavelet transform, the watermark signals were added by various intensity to the wavelet coefficients in the subbands from the lower resolution to the higher resolution whose modification is differently sensitive to HVS. Experimental results are presented to demonstrate the proposed algorithm is robust against noise and spitefully attack base image processing operations.