数字水印在工程图纸版权保护中的应用  

Application of Digital Watermarking in Copyright Protection of Engineering Drawing

作　　者：王丹玫 

机构地区：[1]南瑞集团,江苏南京210003

出　　处：《中国制造业信息化（学术版）》2008年第9期63-66,共4页

摘　　要：通过分析离散小波变换的特点,提出了基于离散小波变换的二维矢量图形水印算法。该算法通过对二维矢量图形的顶点坐标分组、排序,基于离散小波变换将其分解成不同空间和频率上的复值系数,然后将水印嵌入到小波系数的幅值中,从而保证了嵌入水印后二维矢量图形的精度。并可同时在二维矢量图形中嵌入多个水印,以满足版权保护中多水印(公开水印和私有水印)嵌入的要求。实验证明该算法具有良好的不可感知性和较强的鲁棒性。Through analysis of the characteristics of discrete wavelet transform, it proposes the 2d vector graphics watermarking algorithm based on discrete wavelet transform. The algorithm withdraws the vertices and generates some sequences from the 2d vector graphics. The sequences are transformed into different spa- tial and frequency coefficients based on discrete wavelet transform. The algorithm embeds the digital watermarks into the 2d vector graphics by modifying the wavelet magnitude coefficients, which enables the transformed 2d vector graphics to have enough precision. Finally, experiments show the good imperceptibility and robustness under the attacks

关 键 词：版权保护 数字水印 二维矢量图形 小波变换 

分 类 号：TP309[自动化与计算机技术—计算机系统结构]