Estimating motion of an event captured using a digital video camera

摘要

An event aware video system (EAVS) is to capture video frames during a first time period and process events in the video frames before transferring the processed data to a central computing system. The EAVS may establish a present no-event frame from the video frames by marking the last frame as the present no-event frame if the difference between adjacent pair of video frames is less than a threshold value. The EAVS may establish an event frame, wherein a present frame captured after establishing the no-event frame is marked as the event frame if the difference between the present frame and a previous frame is greater than the threshold value. The EAVS may provide event information including motion vectors to a central computing system by performing one-dimensional search on a moving object of the event frame, wherein the motion vectors may represent displacement of objects moving within the moving object.

主权项

1. A method in a video capturing device comprising:
capturing a first plurality of video frames during a first time period; establishing a present no-event frame from the first plurality of video frames, wherein a last frame of the first plurality of video frames is marked as the present no-event frame if the difference between adjacent pair of frames of the first plurality of video frames is less than a threshold value; establishing an event frame, wherein a present frame captured after establishing the no-event frame is marked as the event frame if the difference between the present frame and a previous frame captured prior to the present frame is greater than the threshold value; generating event information including motion vectors, wherein the motion vectors represent displacement of a plurality of objects moving within a moving object, wherein the motion vectors are generated by performing one-dimensional search on a moving object of the event frame; and generating a real motion vector of a moving object in the event frame, wherein generating the real motion vector comprises: labeling the moving object; pairing the moving object in the event frame with a moving object in the previous frame; resizing a boundary of the moving object in the event frame to match a boundary of the moving object in the previous frame; and computing the co-ordinates of the center of gravity of the boundary of the moving object in the event frame and the previous frame.