Double JPEG (Joint Photographic Experts Group) compressed image-targeted tempertamper detection and tempertamper locating method

Abstract

The invention discloses a double JPEG (Joint Photographic Experts Group) compressed image-targeted tempertamper detection method. The tempertamper detection method comprises the steps of: firstly, evaluating the image compression quality factor Q2 by utilizing the header file of a detection image with JPEG format, carrying out first double compression to the detection image by utilizing the quality factor Q2, calculating the square errordifference of corresponding image pixel values before and after the double compression so as to obtain the distortion matrix of the double compression, calculating a local minimum value of the distortion degree to be confirmed as a quality factor Q1, carrying out second double compression to the image subjected to the first double compression by using the quality factor Q1, calculating the square difference of corresponding image pixel values of the image subjected to the second double compression and the detection image to serve as the distortion matrix of the second double compression, conducting tempertamper detection through detecting whether an abnormal area exists in the distortion matrix of the second double compression, displaying the abnormal area in the form of images to obtain the tamper located image display result. According to the inventionmethod, the detection accuracy is high, good robustness on the operation for keeping the contents such as normal image processing and the like is achieved has good robustness, and higher calculation efficiency can be realized.

Description

technical field [0001] The invention belongs to the technical field of image tampering detection, and in particular relates to a tampering detection and tampering positioning method for double JPEG compressed images. Background technique [0002] In recent years, with the rapid popularization of digital acquisition equipment and the widespread use of powerful image editing software, editing and modifying digital images has become easier and easier. In order to meet a certain need or achieve a certain purpose, people can modify and edit digital photos at will, which greatly reduces the credibility of digital photos and subverts the traditional concept of "seeing is believing". How to detect the authenticity of digital images has become an important hot issue and a difficult problem urgently faced by the legal and information industry in recent years. [0003] Digital image content authenticity authentication technology is divided into active forensics [see document 1] and pa...

AI Technical Summary

Problems solved by technology

It can detect tampered images synthesized by images with different JPEG quality factors, but the tampered area of ​​the synthesized image has a difference of more than 20 from the quality factors compressed by other parts, and the detection accuracy can only be achieved when the size of the tampered area is at least 100×100 It is more than 90%, and when there is an inconsistency in the block position in the tampered area, it is necessary to recompress the image under 64 block methods, which requires a lot of calculation

Throughout the current research of this type, there are generally the following problems: (1) The quality factor of the two compressions of the composite image is required to have a certain size relationship; (2) The robustness of the maintenance operation for normal image processing and other content is poor ; (3) The accuracy of tamper detection is not very ideal; (4) The calculation efficiency is not high

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