Patent ID: 8537892
Filing Date: 2013-09-17
Classification: H04N

Abstract:
1. A method for detecting video tampering with a device, comprising: receiving a plurality of data vectors comprising the first digit probability distribution for each video frame of a plurality of video frames for a Group of Pictures (GOP) comprising at least one intra-coded video frame (I video frame), at least one of a plurality of predictive coded video frames (P video frames), and a plurality of bi-directionally predictive coded video frames (B video frames), wherein each of the plurality of video frames is encoded using quantized coefficients associated with the I, P and B video frames; generating an average P frame data vector from one or more of the plurality of data vectors that correspond to the at least one P video frames; generating an average B frame data vector from the ones of the plurality of data vectors that correspond to the plurality of B video frames; generating a combined data vector from the one of the plurality of data vectors that corresponds to the I video frame, the average P frame data vector and the average B frame data vector; comparing each of the first digit probability distributions in the combined data vector to one or more reference distributions; and determining whether the GOP corresponds to a tampered video bitstream based at least in part upon the comparing each of the first digit probability distributions in the combined data vector to the one or more reference distributions.