Method for classifying pixel blocks of JPEG images and image falsification detecting and falsified area positioning methods based on same

A tampered, pixel-block technology, applied in character and pattern recognition, instruments, computer components, etc., can solve the problem of failing to detect and locate tampered areas
CN102521606BInactive Publication Date: 2013-10-23CENT SOUTH UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
CENT SOUTH UNIV
Publication Date
2013-10-23
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention provides a method for classifying pixel blocks of JPEG images and image falsification detecting and falsified area positioning methods based on the same. The method comprises the following steps of: dividing to-be-detected JPEG images into continuous and non-overlapped 8*8 pixel blocks; taking one pixel block as the center and selecting a square area combined by (2n+1)*(2n+1) pixel blocks as a sub-image; utilizing a first number distribution probability feature of AC coefficients in the front i AC coefficient regions of the sub-image to divide the central pixel block into single compression or double compression; and confirming a classifying result as the double compression and a connected region with an area more than M 8*8 pixel blocks as a falsified area. According to the method provided by the invention, the falsified area can be accurately detected and positioned; the falsified areas of three different falsifying technologies can be detected according to the method; the method is wide in application scope; the method is an automatic blind detecting method for JPEG falsified images and does not require any priori knowledge; and the detection coverage rate is higher and the error detection rate is low.
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Description

technical field

[0001] The invention relates to a method for judging whether a digital image has been tampered with, in particular to a method for judging whether a JPEG image has been tampered with and locating the tampered area. Background technique

[0002] With the emergence of increasingly complex image editing software, people can easily tamper with digital images without leaving obvious traces. Therefore, the technical requirements for authenticity identification of digital images and detection of tampered areas are increasing, but at present A variety of detection methods for digital image authenticity identification and tampered areas still have shortcomings such as limited application and high false detection rate.

[0003] In the document "Detecting doubly compressed JPEG images by using mode based first digit features" (IEEE International Workshop on Multimedia Signal Processing, pp.730-735, 2008.), it is disclosed by calculating the first digit distribution of t...

Claims

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