【作者】 徐凤；

【导师】 马洪；

【作者基本信息】 四川大学 ， 概率论与数理统计， 2005， 硕士

【摘要】 今天,伴随着信息产业的飞速发展,信息媒体的数字化和计算机网络技术使得人们对数字信息的获取极为迅捷方便,但是由数字化技术自身特性所产生的负面效应——对数字化信息产品的非法侵权盗版和恶意篡改——也日益严峻。如何在目前开放式的数字化网络环境中对数字信息产品提供切实、有效的版权保护和数据安全性维护手段已成为一个非常现实的问题。围绕这一问题,近几年国际上提出了一种新的有效的数字产品版权保护和安全性维护的新技术——数字水印技术。本文通过在图象的小波域的细节部分进行模糊聚类来寻找适合嵌入水印的位置,再用聚类结果作为嵌入强度来嵌入水印。其原理是充分利用人类视觉系统(HVS)的掩蔽效应和小波多分辨率分析的特点提出了一种新的数字水印嵌入算法,实验表明该方法能在保持图象质量的前提下提高水印的鲁棒性。更多还原

【Abstract】 With the booming development of information industry, the digitalization of information media and the exceptional growing of computer networks, we can get digital information conveniently and quickly. But the negative effect of digitalization technology has made the copyright and security of digital information products be widely threatened now. In the open computer network environment, it has become much urgent for us to provide efficient copyright and security protection means for the digital information products. So the digital watermarking technology has been put forward for this in recent years. An adaptive digital watermarking technique based on discrete wavelet transform (DWT) domain is proposed to classify each individual detail images into two blocks : one is appropriate for embedding watermark ; the other is inappropriate ,by applying fuzzy c-means clustering (FCM)algorithm and fusion of uncertain imformation based on hunman visual system.And the cluster result is used as the strength of watermark.Experiment results show the Technique is more imperceptive and robust than some watermarking algorithms based on DWT.更多还原