基于混沌加密的dwt域数字水印算法  

Digital Watermarking Algorithm Based on Chaotic Encryption DWT

作　　者：龚岩琳[1] 

机构地区：[1]重庆邮电大学,重庆400065

出　　处：《信息通信技术》2010年第3期53-57,共5页Information and communications Technologies

摘　　要：提出了一种将二维混沌系统应用到水印图像预处理中,对水印图像进行混沌加密。然后对载体图像进行三级小波分解,选择在水平和垂直子带中根据分块能量的大小,选择能量块较大的块系数嵌入水印,该算法在水印提取过程中需要原始载体图像。实验结果表明:该算法嵌入的数字水印具有很好的隐蔽性,同时对叠加噪声、平滑滤波等攻击具有很好的鲁棒性。A two-dimensional chaotic systems is applied to make the watermark image pre-processing,which images chaotic encryption.Using wavelet decompose map,we select the horizontal and vertical sub-band,embeding watermark in a larger block which the block coefficient of the energy,the algorithm in the watermark extraction process needs original carrier image.Experimental results show that the algorithm embedded digital watermarking has good hiding and good robustness while superimposed noise and smoothing filtering attack.

关 键 词：数字图像 数字水印 离散小波变换(DWT) 块能量 

分 类 号：TP309.7[自动化与计算机技术—计算机系统结构]