Detection of motion compensated frame interpolation via motion-aligned temporal difference

Motion compensated frame interpolation (MCFI) is a special frame based video manipulation, which increases the temporal continuity of low frame rate videos by synthesizing new frames between successive frames. MCFI might also be used to counterfeit high frame-rate videos, which mislead users’ attraction and waste storage spaces in video-sharing websites. Existing MCFI detectors are designed to judge the absence or presence of MCFI forgery in a controllable environment of known MCFI techniques. Practical detector should consider the possibility of unknown MCFI techniques. We are motivated to propose a robust MCFI detector for more practical scenarios. Considering the effects of non-motion regions in candidate frame, the statistical moments are firstly extracted from motion-aligned frame differences (MAFD). Then, the one-class support vector machine (SVM), following a training stage capturing the properties of original frames, is exploited to judge whether the candidate frame is interpolated by MCFI or not. Finally, a special interpolated frame detection (SIFD) is designed to pick out interpolated frames, which are synthesized from two consecutive reference frames with no motion vectors (MVs) or less MVs. A series of experiments evaluated on four representative MCFI techniques have shown promising results.