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Method and system for video tampering detection

A technology of tampering detection and video, which is applied in the direction of digital video signal modification, electrical components, image communication, etc. It can solve the problems of difficult to distinguish whether it has been tampered with, complex implementation, etc., and achieve the effect of good compatibility and accurate detection rate

Inactive Publication Date: 2017-02-15
GUANGDONG VTRON TECH CO LTD
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Problems solved by technology

[0005] In the first method, although motion vectors can be used to accurately determine whether the video has been tampered with, the use of motion vectors needs to consider the correlation between the front and rear frames, which is more complicated to implement.
[0006] In the second method, if the content of the tampered video is large, it can be detected very well, but if a small part of the video is tampered with, the content correlation between the tampered places will basically not be Affected, it is difficult to distinguish whether it has been tampered with at this time

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  • Method and system for video tampering detection
  • Method and system for video tampering detection

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[0023] In order to make the purpose, technical solution and advantages of the present invention more clear, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, and do not limit the protection scope of the present invention.

[0024] Video tampering detection method of the present invention, such as figure 1 shown, including steps:

[0025] Step s101, record the detected video as video 0, first decompress it into the airspace and record the DCT coefficient (discrete cosine coefficient) of the I frame frequency domain at this time, and then compress and encode the data in the airspace to obtain Video 1, decompress video 1 to obtain the DCT coefficients of its I frame, compare the different numbers of DCT coefficients corresponding to each macroblock in video 0 and video 1, the different nu...

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Abstract

The invention discloses a method and system for video tampering detection. The corresponding features of the detected video are used as feature values, and at the same time, videos known to be tampered or not are used as sample sets to train a prediction model of a support vector machine, thereby using the prediction The model performs video tampering detection. This method and system do not need to consider the more complex motion vectors in video coding to detect whether the identified video has been modified, and it is relatively simple to implement, can achieve higher and more accurate detection rates, and can be applied to various types of codes that use different codes. way of video, so it has good compatibility.

Description

technical field [0001] The invention relates to the technical field of video detection, in particular to a video tampering detection method and system. Background technique [0002] In the video surveillance system, the image masking technology is used to prevent the video from being tampered with. Once the video has been tampered with, there are two main detection technologies at present: [0003] 1. The motion vector detection method is mainly judged by the motion vectors of the P frame and the B frame. [0004] 2. Based on the detection of the continuity of content between frames, the correlation of content between frames in the video is used to determine whether the video has been tampered with. [0005] In the first method, although the use of motion vectors can accurately determine whether the video has been tampered with, the use of motion vectors needs to take into account the correlation between the front and rear frames, which is more complicated to implement. ...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04N19/625H04N19/635H04N19/61
Inventor 黄振镇谭小刚郑钻哲
Owner GUANGDONG VTRON TECH CO LTD
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