基于JND和元胞自动机变换的可逆水印  

Reversible Watermarking Based on JND and Cellular Automata Transform

作　　者：刘娜 

机构地区：[1]西安产品质量监督检验院轻工室,陕西西安710065

出　　处：《电子科技》2012年第3期55-58,共4页Electronic Science and Technology

摘　　要：提出了一种基于JND和元胞自动机变换的可逆水印算法。首先利用直方图调整技术对原始图像进行灰度值调整,然后通过整数小波变换获得原始图像的高频子带,并基于JND模型计算小波系数的恰可失真门限,最后利用扩频水印技术将由元胞自动机变换加密后的水印图像嵌入到原始图像中。实验结果表明,该算法在获得较高嵌入容量的情况下,显著提高了含水印图像的视觉质量。A reversible watermarking method using JND and cellular automata transform（CAT） is proposed.Histogram adjustment technique is first adopted to change the grayscale values of the original images in order to prevent the overflow and underflow of pixels during embedding.Then,the original images are decomposed with the integer wavelet transform（IWT） to extract the high frequency sub-bands for embedding.By calculating the just noticeable difference（JND） of each coefficient,the embedding regions and strength can be controlled flexibly.Finally,the watermark image which is encrypted by CAT is embedded into the chosen wavelet coefficients using the spread spectrum technique.Experimental results show that the proposed method greatly improves the invisibility of watermarks while achieving good capacity.

关 键 词：可逆水印 JND 元胞自动机变换 

分 类 号：TP391.41[自动化与计算机技术—计算机应用技术]