摘要
1.引言
随着多媒体技术和网络技术的飞速发展和广泛应用,数字图像、音频和视频等多媒体数字产品愈来愈需要一种有效的版权保护方法,数字水印技术就是针对这一问题而提出来的.
Watermark technology has been developed to tackle the problem of unauthorized copying and distribution of digital data. Many different schemes have been proposed in the last few years, but most of them are symmetric, i. e. , the key used for watermarking embedding is just the same used for watermarking detection. However, in many applications we need an asymmetric scheme, where a private key is used for watermark embedding, and a public key is used for watermark detection. Recently some asymmetric watermark schemes have been proposed. In this paper, we study one watermark scheme based on spread spectrum.We propose a way to generate public/private key to prevent the cheat of the copyright owner, and reducing the information need for watermark detection. Then we study the some problems of the watermark detection, and give a modified watermark detection schemes.
出处
《计算机科学》
CSCD
北大核心
2002年第9期63-65,共3页
Computer Science
基金
中科院计算所创新课题"高性能媒体服务器"的资助
