这个是数字水印几种变换域的研究，主要是对这几种不同的变换域做了比较，对数字水印的变换介绍还是很详细的-This paper is mainly to the watermark transform domain research, hope of the useful this is digital watermarking several transform domain research, mainly is for those different transform domain are compared, the transformation of digital watermark is still very detailed introduced