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1. (WO2010122301) OBJECT TRACKING USING MOMENTUM AND ACCELERATION VECTORS IN A MOTION ESTIMATION SYSTEM

Pub. No.:    WO/2010/122301    International Application No.:    PCT/GB2010/000803
Publication Date: Fri Oct 29 01:59:59 CEST 2010 International Filing Date: Fri Apr 23 01:59:59 CEST 2010
IPC: H04N 5/14
G06T 7/20
Applicants: IMAGINATION TECHNOLOGIES LIMITED
FISHWICK, Steven, John
MORPHET, Stephen
Inventors: FISHWICK, Steven, John
MORPHET, Stephen
Title: OBJECT TRACKING USING MOMENTUM AND ACCELERATION VECTORS IN A MOTION ESTIMATION SYSTEM
Abstract:
There is provided a method and apparatus for motion estimation in a sequence of video images. The method comprises a) subdividing each field or frame of a sequence of video images into a plurality of blocks, b) assigning to each block in each video field or frame a respective set of candidate motion vectors, c) determining for each block in a current video field or frame, which of its respective candidate motion vectors produces a best match to a block in a previous video field or frame, d) forming a motion vector field for the current video field or frame using the thus determined best match vectors for each block, and e) forming a further motion vector field by storing a candidate motion vector derived from the best match vector at a block location offset by a distance derived from the candidate motion vector. Finally, steps a) to e) are repeated for a video field or frame following the current video field or frame. The set of candidate motion vectors assigned at step b) to a block in the following video field or frame includes the candidates stored at that block location at step e) during the current video field or frameThe method enables a block or tile based motion estimator to improve its accuracy by introducing true motion vector candidates derived from the physical behaviour of real world objects.