Technique for estimation of displacement and/or velocity of...

Details Technique for estimation of displacement and/or velocity of... Technique for estimation of displacement and/or velocity of...

H - Electricity

04

N

350/3, 350/33, 3

H04N 7/00 (2006.01) G01S 11/12 (2006.01) H04N 7/26 (2006.01)

Patent

CA 1143827

NETRAVALI - 10 28 TECHNIQUE FOR ESTIMATION OF DISPLACEMENT AND/OR VELOCITY OF OBJECTS IN VIDEO SCENES Abstract of the Disclosure A technique for estimation of displacement and/or velocity of objects in television scenes is recursive, in that each displacement calculation is made using the results of the previous calculation In a first embodiment, a displaced frame difference DFD (i.e., the intensity difference between a spatial location in the present video frame and a location in the previous frame displaced from that location by an initial displacement estimate) is updated using the initial value of DFD normalized by a measure of local picture activity. In a second embodiment, the update is a multiplicative function of DFD and the intensity gradient at the displaced location in the previous frame.

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