基于多通道的彩色图像水印方案  

Multi-Channel Based Watermarking Scheme for Color Image

作　　者：李晓强[1] 薛向阳[1] 

机构地区：[1]复旦大学计算机科学与工程系

出　　处：《计算机学报》2004年第9期1238-1244,共7页Chinese Journal of Computers

基　　金：国家自然科学基金 (60 0 0 30 1 7);国家"八六三"高技术研究发展计划项目基金 (2 0 0 1AA1 1 4 1 2 0 ;2 0 0 2AA1 0 30 65)资助

摘　　要：空域水印算法的特点是鲁棒性较差 .针对这个问题 ,该文提出了一个基于多通道的彩色图像水印方案 :利用发送分集技术的思想 ,把相同的水印信息经过伪随机调制、交织编码后嵌入到彩色图像的红、绿、蓝三个颜色通道 ,然后使用两种简单方案提取水印信息 ,降低了误码率 .该文从理论上定性地分析了算法的有效性 ,同时用大量实验结果表明 ,该算法在提高水印容量的前提下 ,改善了彩色图像中传统空域水印方案的鲁棒性 ,并且水印提取算法的计算量较小 ,可应用于实时视频水印方案中 .This paper presents a new watermarking technique in spatial domain expressly devised for color images, which is based on the theory of transmit diversity techniques, considering the RGB image as three independent slowly fading channels. Modulated by different Pseudo-random sequences and interleavers respectively, the same watermark in different form is put into three color channels simultaneously. This scenario makes up the weakness in single color channel schemes that single color channel is prone to severe fading. Authors use two extraction methods to improve accuracy of decision. Theory analysis and experimental results demonstrate the validity of the new approach compared with algorithms operating on single color channel, explicitly lower bit error rate in most cases. Contrast to the present spatial watermarking schemes, this algorithm is considerably robust to many intentional and unintentional attacks. Moreover, information can be extracted in real time without the original image so that this scenario can be applied in video watermarking.

关 键 词：数字水印 彩色图像 发送分集技术 

分 类 号：TP391[自动化与计算机技术—计算机应用技术]