一种基于混沌加密的自适应图像水印方法  

Adaptive image watermarking method based on chaotic encryption

作　　者：陈永强[1] 

机构地区：[1]武汉科技学院计算机科学学院,武汉430073

出　　处：《计算机应用》2007年第10期2453-2455,共3页journal of Computer Applications

摘　　要：针对数字水印所要求的安全性、鲁棒性和隐蔽性等特性,提出了一种使用二维混沌加密和人类视觉模型的小波域数字图像水印技术。研究实现了对有意义水印灰度图像的二维Logistic混沌映射加密算法,并结合人类视觉模型,计算加密二值水印的分块嵌入强度,自适应地完成水印在载体图像的小波分解系数中的嵌入和提取过程。实验结果表明,所实现的加密和水印嵌入算法计算量小,能承受常规的数字图像处理,具有良好的数字水印特性。According to the charactersitics of the digital watermark, this paper proposed a kind of wavelet domain image digital watermarking technique using two-dimensional chaotic encrypt and human visual model. The meaningful gray watermarking image was encrypted by two-dimensional Logistic chaotic map. The block embedding intensity was calculated being combined with the human visual model so that the embedding and detection steps of encrypted binary watermark can be adaptively fulfilled in the multi-resolution wavelet coefficients of the host image. The cxperimental results have shown that this watermarking technique, in which the encrypting and embedding algorithms have less computational capacity, can endure regular digital image process and has good performance.

关 键 词：数字水印 混沌 人类视觉模型 

分 类 号：TP309[自动化与计算机技术—计算机系统结构] TP39[自动化与计算机技术—计算机科学与技术]