上海大学学报(自然科学版) ›› 2011, Vol. 17 ›› Issue (5): 586-590.doi: 10.3969/j.issn.1007-2861.2011.05.002

• 通信与信息工程 • 上一篇    下一篇

动态阈值模糊检测在篡改图像检测中的应用

刘凯,扈文斌   

  1. 上海大学 特种光纤与光接入网省部共建重点实验室,上海 200072
  • 收稿日期:2010-04-06 出版日期:2011-10-26 发布日期:2011-10-26
  • 通讯作者: 刘凯(1981~),男,讲师,博士,研究方向为通信信号处理及图像处理. E-mail:liukai@shu.edu.cn E-mail:liukai@shu.edu.cn
  • 基金资助:

    国家自然科学基金资助项目(60872114);上海市重点学科建设资助项目(S30108);上海市科委重点实验室资助项目(08DZ2231100)

Detection of Forged Image Based on Partial Blur Detection with Dynamical Threshold

LIU Kai,HU Wen-bin   

  1. Key Laboratory of Specialty Fiber Optics and Optical Access Networks, Shanghai University, Shanghai 200072, China
  • Received:2010-04-06 Online:2011-10-26 Published:2011-10-26

摘要: 提出一种新的图像局部模糊检测方法,并将其应用于篡改图像的检测.该方法基于最小二乘估计来计算图像中每个像素的估计误差,再将每个像素和其周围像素估计误差的方差作为模糊特征,然后利用频域的相关系数确定一置信区间,并根据该区间模糊特征的概率分布特性动态确定阈值,进而分离出模糊区域内的像素.实验结果表明,该方法能获得更高的检测正确率和分离精度.

关键词: 篡改检测, 动态阈值, 模糊特征, 最小二乘估计

Abstract: A novel approach of regional blur identification is proposed and applied to image forgery detection. Based on least-square (LS) estimation, prediction error of each pixel is calculated. Variance of the prediction errors of a pixel and its neighborhood is regarded as the blur characteristic of the pixel. A threshold is determined dynamically according to the distribution of correlation coefficient in the frequency domain and blur characteristic in the spatial domain. Thus pixels in a blurred area are discriminated from sharp pixels. Experimental results show that the proposed method has a high accuracy rate in blur region detection.

Key words: blur characteristic, dynamical threshold, forgery detection, least-square estimation

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