一种基于小波系数的差异量化水印新算法

根据胡青等提出的小波系数差异量化改进算法,提出一种新的改进措施.选择两个高频子带来划分数据块,并找出各数据块的最大幅值;根据密钥在两个高频子带各选一个数据块分为一组,并计算每组两数据块的最大幅值的幅值差;最后,根据幅值差,在差异最明显和最不明显的数据组量化嵌入水印信息.实验结果表明,该方案不仅具有更好的透明性,而且能有效抵抗各种攻击.

A New Watermarking Algorithm Based Significant Difference of Wavelet Coefficient Quantization

A new watermarking algorithm is proposed based on ＂Improved Watermarking Based on Significant Difference of Wavelet Coefficient Quantization＂ by HU Qing, et al. Firstly, two high frequency sub-bands into data bolcks are selected, and the maximum amplitude of each data block is calculated. Secondly, a block in two sets of the array bock is chosen respectively into a group according to the key, and the difference of the maximum amplitude is calculated. Then, the watermark is embedded in the most obvious differences and is not the obvious data block. Experimental results show that the scheme has the better transparency and robustness against most of the attacks.