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针对Poisson方程图像编辑的篡改检测
引用本文:秦川,王朔中,张新鹏.针对Poisson方程图像编辑的篡改检测[J].计算机研究与发展,2009,46(Z1).
作者姓名:秦川  王朔中  张新鹏
作者单位:上海大学通信与信息工程学院,上海,200072
基金项目:国家自然科学基金项目,国家"八六三"高技术研究发展计划基金项目 
摘    要:给出一种针对Poisson图像编辑方法的被动认证方法.首先通过Poisson方程对图像分块粗略匹配以快速地检测出两个相似的克隆区域,再利用像素级精确匹配得到对应区域的精确边界.为了进一步推测篡改者的动机,估计原始图像的真实面貌,将两个对应区域边界上的Laplace值进行累加,比较两个相似区域在边界处的不连续性,可以确定边界具有较大Laplace累加值的区域为克隆目标区,从而实现对Poisson图像编辑的被动认证.实验结果表明,该方法能对同一幅图像中的克隆编辑进行可靠检测,并确定源区和克隆区,为数字图像的被动认证提供有效手段.

关 键 词:图像编辑  Poisson方程  图像篡改  被动认证

Image Authentication against Local Area Cloning by Detecting Poisson Editing
Qin Chuan,Wang Shuozhong,Zhang Xinpeng.Image Authentication against Local Area Cloning by Detecting Poisson Editing[J].Journal of Computer Research and Development,2009,46(Z1).
Authors:Qin Chuan  Wang Shuozhong  Zhang Xinpeng
Abstract:An image authentication technique is proposed to detect image forgery that is done by Poisson editing,which copies a small region from the same image and makes the image look natural.By roughly matching the regions which satisfy the Poisson equation,two similar image blocks,one of which is a cloned result of the other,can be identified quickly.The precise boundaries of these two areas are figured out by refined matching with pixel-level precision.Laplacian values on the two boundaries are summed up respectively,and the original and cloned regions can be identified according to the extent of image discontinuity in the boundary regions.The region with a larger cumulated Laplacian value can be judged as the target area.Provided in this paper is a means for passive image authentication against cloning within the same image.
Keywords:image editing  Poisson equation  image forgery  passive authentication
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