基于位平面的数字水印算法  

A Digital Watermarking Algorithm Based on Bit Planes

作　　者：卢宗庆[1] 梅蕤蕤[2] 黄敬雄[1] 

机构地区：[1]深圳大学信息工程学院,深圳518060 [2]西安电子科技大学电子工程学院,西安710071

出　　处：《计算机工程与应用》2003年第6期79-81,107,共4页Computer Engineering and Applications

摘　　要：论文提出一种基于位平面的数字水印算法,通过改变小波分解后不同分辨率下细节子图某些位平面的信息来嵌入二值水印。水印检测时计算待测图像小波分解后细节子图某些位平面的差异值,并将差异值映射为少量灰度级的图像而实现二值水印的检测,所以水印提取不需原图参与。实验显示论文提出的数字水印算法,对一些图象处理操作及JPEG压缩是鲁棒的。A digital watermarking algorithm for gray images is proposed based on the information of bit planes.The bi-nary digital watermark is embedded by changing information of some bit planes in DWT subimages at different resolu-tions.The watermark can be extracted without the host image.Extraction presents a method relying on the difference a-mong some bit plane values of subimages of the decomposed watermarked image which is then mapped to an image with a few shades of gray.Experimental results show that the embedded watermark is robust enough to JPEG and some image processing operations.

关 键 词：位平面 数字水印算法 离散小波变换 图像视频编码 图像处理 版权保护 

分 类 号：TN919.81[电子电信—通信与信息系统] D923.41[电子电信—信息与通信工程]