测绘科学技术学报2017，Vol.34Issue(3)：300-304,310,6.DOI:10.3969/j.issn.1673-6338.2017.03.016
一种用于篡改定位及近似恢复的水印算法
Watermarking Method with Tamper Localization and Approximate Recovery Capability
摘要
Abstract
A semi-fragile watermarking method with tamper localization and recovery capability was proposed in order to settle the problem that remote sensing images were easily to be tampered maliciously.Authentication watermarking,composed of a binary random matrix,was embedded through the way of quantizing the coefficients with maximum absolute value in directional subbands of Contourlet transform.Recovery watermarking,which was formed by the average gray value of every non-overlapping 4×4 block,was embedded in the least significant bit.The watermarking detection was a blind extraction procedure,which could be implemented directly without using the host images.Experimental results demonstrated that the method could resist adding noise,JPEG compression and other rational distortions to a certain extent.Meanwhile,it was fragile to malicious manipulation,and could locate the tampered regions accurately and recover them approximately,and the recovered images could meet thebasic visual need.So the proposed semi-fragile watermarking method was able to ensure images security effectively.关键词
半脆弱水印/Contourlet变换/篡改定位/内容恢复/遥感影像/数据精度Key words
semi-fragile watermarking/Contourlet transform/tamper localization/tamper recovery/remote sensing images/data accuracy分类
天文与地球科学引用本文复制引用
侯翔,杨辉..一种用于篡改定位及近似恢复的水印算法[J].测绘科学技术学报,2017,34(3):300-304,310,6.基金项目
地理信息工程国家重点实验室开放基金项目(SKLGIE2014-M-4-6). （SKLGIE2014-M-4-6）
