Method, system and computer program product for detecting pornographic contents in video sequences

Abstract

A method for detecting the presence of pornographic contents in a sequence of video frames having associated respective motion vectors, includes identifying groups of motion vectors having similar orientation and the presence, in subsequent frames of the sequence, of motion types defined by affiliated groups of motion vectors having homologous motion characteristics in subsequent frames. Thereafter, detection in these motion types of the occurrence of negative affiliations representative of an inversion in the motion of the respective group of vectors. If the number of such negative affiliations counted at a given interval reaches a given count threshold, identified in the sequence of frames is a periodic motion susceptible of having pornographic content. Repetition of the periodic motions may be verified, the image sequence identified as susceptible to having pornographic contents and/or subjected to an optional verification procedure such as 'skin detection' type, and transmission may be blocked.