基于宏块强度的视频帧复制篡改检测

Detection of Video Frame Duplication Based on Macroblock Intensity

本文针对H.264视频的帧复制篡改问题,提出一种基于宏块强度的帧复制篡改检测方法。在进行帧间复制篡改后,视频中的复制帧与被复制帧的相关性增强,导致复制帧内零向量宏块或跳跃宏块数量异常。本文首先介绍了零向量宏块强度和跳跃宏块强度的概念,然后对视频逐帧进行宏块强度计算和分析,最后基于分析结果对复制帧进行定位。仿真实验结果证明,所提方法对于识别帧复制篡改视频、定位篡改点是有效的。该方法也能为视频真实性(完整性)的鉴定提供支撑。

Video frame duplication is a forgery to video materials,requiring forensic identification when a video requests its authenticity.Here,a method is tentatively proposed to detect video frame duplication based on macroblock intensity.As the correlation is enhanced between the original frame and its duplicated one when a video frame has been duplicated and pasted,an abnormality will appear in the duplicated frame at the amount of macroblock from both the zero-vector’s and skip’s.About this assay,an introduction was here at first put on the concept of macroblock intensity of zero-vector and skip.With one experimental video existing frame duplication,the macroblock intensities were successively calculated and analyzed frame by frame.Consequently,the duplicated frames were finally located.Through simulation tests,it was verified that the identification of frame duplication can be got through based on the abnormal macroblock intensity of both zero-vector and skip,capable of locating the tamper sites and ascertaining the authenticity(integrity)of related videos.The proposed method is therefore effective for recognizing the forged video of frame duplication.