【摘要】 数字水印是近年来出现的一种新的数字多媒体产品版权保护技术,用于嵌入水印的算法的不同使得该技术的不可见性,鲁棒性等特性大相径庭。对目前用于图像数字水印的几种频率域方法进行了描述,并分别从水印含量、抵抗各种攻击的能力等方面进行了定性和定量的比较,最后总结了每种方法的优缺点。更多还原

【Abstract】 Digital watermarking is a new technique for digital multimedia copyright protection, the differences of the algorithms make the robustness and the imperceptibility of this technique very different. Three algorithms in frequent domain are described, and gray picture digital watermarking is analyzed and compared. The quantity of watermark and robust against diversified attacks are compared. In the end, the advantages and disadvantages of each method are summarized.更多还原