Video inter-frame tampering detection method and system for eliminating gop periodic noise effect

Abstract

The present invention provides a method and system for detecting tampering between video frames that eliminate GOP periodic noise effects, which can be used to detect tampering of video frame deletion, frame insertion, and frame duplication, and can solve the situation of periodic mutation of optical flow caused by encoding . First, the compressed and encoded video is decoded into a frame sequence, and then the L-K optical flow is calculated between two frames to obtain the optical flow sequence of the entire frame sequence. Then calculate the optical flow sequence, generate the optical flow change sequence and normalize it. Due to the encoding and quantization, periodic peaks will appear in the optical flow change sequence, making the judgment result wrong. Therefore, the detection period effect is added. Algorithm, and finally use the different modes of the normalized and deperiodic optical flow change sequence to detect inter-frame tampering. The invention improves the original optical flow detection algorithm and adds an algorithm for removing periodic effects, so that the algorithm has stronger robustness and wider application.

Description

technical field [0001] The invention relates to a method for detecting tampering between video frames, in particular to a method and system for detecting tampering between video frames that eliminate GOP periodic noise effects, especially a method for detecting tampering between video frames that can remove periodic effects caused by encoding. Background technique [0002] With the continuous development of multimedia technology, digital video has become an indispensable part of life. At the same time, surveillance cameras can be seen everywhere in various regions, playing an increasingly important role in judicial evidence collection. However, with the emergence of various video editing software, videos can be tampered with more easily, so that the original content in the video is changed. Therefore, it is necessary to verify the integrity and authenticity of the video content. [0003] Tampering between video frames is a common tampering technique, which includes frame d...

AI Technical Summary

Problems solved by technology

After experiments, we found that due to the GOP structure, optical flow will be affected by video encoding, and periodic spikes will appear in the optical flow sequence, resulting in misjudgment of results

[0004] The patent document titled "Method for Detection of Tampering Between Video Frames Based on Optical Flow Consistency" (Application No.: 201310307481.6; Publication No. CN103384331A) proposes a technical solution for inter-frame tampering detection using optical flow consistency. One defect of the technical solution is that for some MPEG4 or AVC encoded videos, periodic spikes will appear in the optical flow change sequence, causing the algorithm to fail

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