小波编码半脆弱水印在图像认证中的应用  

An Application of Semi-fragile Watermark Based on Wavelet Transform Coding in Image Authentication

作　　者：朱洁娜[1] 刘晓霞[1] 郭晓艳[1] 

机构地区：[1]西北大学计算机科学系,陕西西安710069

出　　处：《微机发展》2005年第5期106-110,共5页Microcomputer Development

基　　金：西北大学科学研究基金

摘　　要：根据小波变换编码的原理,提出了一种使用了能经受有损压缩的半脆弱水印的图像认证系统。这种算法将原始载体图像分解为小波系数,然后对小波系数进行量化,之后嵌入伪随机比特模板。认证过程则是首先从水印图像中提取出嵌入的比特,再用这些值和伪随机模板相应的比特进行比较,并且将匹配的百分比和阈值τmatch进行比较,如果这个百分比大于阈值,则通过认证。The system for image authentication based on wavelet transform coding was proposed by using a compression-tolerant semi-fragile watermark. The original image was decomposed into wavelet coefficients in this algorithm. Then quantize their wavelet coefficients. Finally, embed pseudo-random bit pattern. The process of authentication is to extract embedded bit from image embedded watermark, then compare them with pseudo-random bit pattern, compare the matching-percent with threshold(τ (match)). The image passed authentication depends on whether the matching-percent is great than threshold or not.

关 键 词：图像水印 离散小波变换 小波变换编码 内容认证 半脆弱水印 

分 类 号：TN919.81[电子电信—通信与信息系统]