%0 Journal Article
%T Re-sampling detection in information forensics<br>信息取证中图像重采样检测
%A ZHU Xiu-ming
%A XUAN Guo-rong
%A YAO Qiu-ming
%A TONG Xue-feng
%A SHI Yun-qing
%A <br>朱秀明
%A 宣国荣
%A 姚秋明
%A 童学锋
%A 施云庆
%J 计算机应用
%D 2006
%I 
%X A digital image generated by re-sampling is the combination of the original image signal and periodical signal. Through the analysis of the two original signals by using EM algorithm, the traces of re-sampling could be detected. Through the modification of the present model, the uniform distribution was supplanted by the original image distribution and a priori probability updating was added in order to approach the realistic distribution. The possible singular points during the EM iterations were avoided by adding a small threshold. Experiment results demonstrate the effectiveness of the modified model in detecting image re-sampling. Furthermore, it can detect re-sampling traces on uncompressed bmp or tiff images, and it even can detect whether an image is JPEG compressed accurately.
%K Expectation Maximization(EM) algorithm
%K forensics
%K re-sampling
%K parameter estimation<br>期望最大化算法
%K 数字取证
%K 重采样
%K 参数估计
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=5B3AB970F71A803DEACDC0559115BFCF0A068CD97DD29835&cid=8240383F08CE46C8B05036380D75B607&jid=831E194C147C78FAAFCC50BC7ADD1732&aid=1B0259E41D995846&yid=37904DC365DD7266&vid=96C778EE049EE47D&iid=708DD6B15D2464E8&sid=06B9C1944573F618&eid=6322700FAECA3E16&journal_id=1001-9081&journal_name=计算机应用&referenced_num=2&reference_num=4