置乱技术在数字水印中的应用

近年来，数字水印技术开始广泛应用于数字图象的版权保护，大量的数字水印方案被提出了出来，本文对置乱技术在数字水印中的应用进行了研究并提出了置乱程度的标准测度，这个标准测度能够帮助我们判断了达到最好的水印鲁棒性对一幅图象应该置乱到什么程度。最后，本文提出两种在水印系统中应用的置乱技术，实验结果表明置乱技术在抵抗剪切攻击方面是非常有效的。

Application of Shuffling Techniques within Watermarking

In recent years, digital watermarking has been widely used in copyright protection for digital images, and a large number of schemes have been proposed. In this paper, the application of shuffling techniques within watermarking and present criterion measure on shuffling degree is extensively studied. The criterion measure is helpful to decide how far to shuffle a image in order to obtain the best robustness. As examples, two novel applications within watermarking system are presented and compared. Experimental results indicate that these techniques are very effective in respect of keeping resilience to cropping attack.