Video intra-frame copy-move tampering detection method based on space and time relevance

Abstract

The invention provides a video intra-frame copy-move tampering detection method based on space and time relevance. The video intra-frame copy-move tampering detection method comprises the steps that firstly, downscaling processing is conducted on a video frame according to an establishment method of an image Gaussian pyramid; then, a time threshold value and a peak threshold value are set in a self-adaptive mode through time relevance and space relevance of the content of a monitoring video respectively; suspicious frame pairs which may have intra-frame copy-move tampering are screened out through phase correlation and a detection method based on block matching, and a binary image which describes the position of a tampered area is obtained through calculation; finally, suspicious frames are grouped through the time threshold value and then final judgment is carried out. Compared with similar algorithms, the video intra-frame copy-move tampering detection method based on space and time relevance has the advantages that the operation time is shortened greatly, and the robustness of an algorithm on Gaussian noise is enhanced. When the tampered area is described through the binary image, the operation of morphological filtering is added, interference caused by erroneous judgment points and noise points can be eliminated to a certain extent, and detection accuracy is improved.

Description

technical field [0001] The invention belongs to the field of video tampering detection, and in particular relates to a method for detecting copy-move tampering in a video frame based on spatiotemporal correlation. Background technique [0002] With the rapid development of information technology, digital video has been widely used in many fields. The increasing popularity of high-quality digital camera equipment, powerful video editing software, and the rise of a large number of video sharing sites make it easier to obtain digital video and maliciously tamper with it. In judicial forensics, malicious tampering makes it difficult to guarantee the authenticity and integrity of digital video. How to accurately judge whether there is malicious tampering in a digital video has become an important research topic in the field of information security. [0003] At present, typical video tampering can be divided into intra-frame tampering and inter-frame tampering according to the o...

AI Technical Summary

Problems solved by technology

The existing algorithms for intra-frame tampering mainly detect the tampering that covers the foreground area with the same background, and the detection algorithm for intra-frame copy-move tampering, after searching the existing literature, it is found that only W.Wang proposed it. The method is to use phase correlation to detect whether there is a suspicious similar area between two frames, and then use the similarity in the space domain to determine the similar area for the suspicious two frames after preliminary selection, and finally calculate the size of the area to determine whether there is an intra-frame copy- move tampering, but the calculation amount of this method is extremely high, the applicability of the fixed threshold is poor, and the false alarm rate is high due to certain limitations of the judgment mode

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