摘要
按照水印在数字产品版权保护上的应用划分,数字水印目前可分为2大类,即鲁棒水印与脆弱水印.设计鲁棒水印的目地在于,即使图像遭到了试图去除水印的攻击,例如对图像进行压缩或者向图像中添加噪声,也能够从图像中检测出水印;而脆弱水印则主要用来对图像进行防篡改验证,它能够检测到所添加水印的微小变化.当对数字产品进行轻微修改时,例如对水印图像进行高质量的压缩,以上2种水印都不理想.因为这2种水印不足以验证图像的篡改情况.介绍一种新型的水印———半脆弱水印,通过定义一个小波域内小波树的能量与水印嵌入强度因子之间的函数,提出了一个新的半脆弱水印算法,向图像中嵌入自适应的水印.实验结果表明,该算法能够检测到对水印图像的轻微修改,并且水印检测器对图像的轻微修改输出灵敏度高.
Watermarking technology to protect the copyright ownership of a digital product is currently divided into two classes: robust watermarking technology and fragile watermarking technology. Robust watermarks are designed to withstand attacks on an image even after attempts are made to remove them such as compression or noise-adding. Fragile watermarks are used for authentication purposes and are capable of detecting minute changes of the watermark's content. When considering slight modifications to the digital products such as high quality compression, neither type of watermark is ideal. A new type of watermark, semi-fragile watermarking, is introduced. By defining a function between the embedded watermark strength factor and the energy of the wavelet trees in the wavelet domain, a new algorithm is proposed to embed a self-adapted watermark into the image. Experiments show that the algorithm is able to detect slight changes of the watermarking image, and the detector is also sensitive to slight changes.
出处
《哈尔滨工程大学学报》
EI
CAS
CSCD
北大核心
2005年第1期127-131,共5页
Journal of Harbin Engineering University
关键词
离散小波变换
半脆弱数字水印
图像验证
版权保护
Algorithms
Design
Image processing
Robustness (control systems)
Trees (mathematics)
Wavelet transforms
