Double-compression detection method by using quantification factor same as H.264 video

Abstract

The invention provides a double-compression detection method by using a quantification factor same as an H.264 video. The method comprises the steps of 1, acquiring intra-frame prediction macro block modes of all macro blocks of an I frame by decoding an input video; 2, coding a YUV sequence by using the quantification factor same as the previous input video, thus acquiring the next input video, and acquiring the intra-frame prediction macro block modes of the all macro blocks of the I frame of the video; 3, repeating the step 2 for K times, and computing the average quantity Cn of the macro blocks of which the intra-frame prediction macro block modes change in each I frame between the videos of adjacent compression visions; 4, respectively dividing the Cn acquired by K times by the total quantity of the corresponding macro blocks in the single frame of the video, and constituting results into a K-dimensional characteristic vector; and 5, judging whether the video is subjected to the double compression of the same quantification factor by using a characteristic vector training classifier of a training video set. The method provided by the invention is high in accuracy and has good robustness for the different quantification factors and video resolution.

Description

technical field [0001] The invention relates to a double compression detection method, in particular to a double compression detection method of H.264 video with the same quantization factor. Background technique [0002] In order to verify whether the digital video has been tampered with, many active forensic techniques have been proposed, such as: digital watermarking technology. Active forensics requires embedding authentication information into digital video. However, in reality, the video is often not embedded with authentication information when it is first recorded, so the passive forensics technology that only relies on the inherent characteristics of digital video for detection has a large application space. The tampering operation of the video is generally at the level of the non-coding domain, so the tampering video will be compressed at least twice. According to whether the GOP structure is the same in the two compressions, the double compression of video can b...

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