Patent Document ID: 9977970
Application ID: 15196753
Patent Status: 1

Claim One:
1. A computer-implemented method for automatically detecting an occurrence of an interaction event of two or more people concurrently present in a surveilled area using a video camera directed towards the surveilled area, the method comprising: a) acquiring a video stream from the video camera, the video stream including a temporal sequence of video frames including the surveilled area within a FOV (field-of-view) associated with the video camera; b) detecting and tracking two or more people within a common temporal sequence of video frames included in the video stream, and generating a trajectory of each person tracked within the first common temporal sequence of video frames; c) processing the trajectories of the tracked people to extract one or more trajectory interaction features (TIFs) associated with the trajectories of the two or more people tracked within the first common temporal sequence of video frames; and d) applying predefined heuristics to the extracted TIFs to detect an interaction event associated with the predefined heuristics has occurred between at least two people of the two or more people tracked within the first common temporal sequence of video frames, wherein the TIFs include one or more of a position, a velocity and a relative distance associated with the two or more people within the first common temporal sequence of video frames, and the predefined heuristics applied in step d) include the calculation of an evidence vector state, the evidence vector state calculated as a function of a velocity threshold and a proximity threshold associated with the two or more people tracked within the first common temporal sequence of video frames.