TECHNIQUE FOR ESTIMATION OF DISPLACEMENT AND/OR VELOCITY OF OBJECTS IN VIDEO SCENES

摘要

NETRAVALI - 1028TECHNIQUE FOR ESTIMATION OF DISPLACEMENTAND/OR VELOCITY OF OBJECTS IN VIDEO SCENESAbstract of the DisclosureA technique for estimation of displacementand/or velocity of objects in television scenes isrecursive, in that each displacement calculation ismade using the results of the previous calculationIn a first embodiment, a displaced frame difference DFD(i.e., the intensity difference between a spatiallocation in the present video frame and a location inthe previous frame displaced from that location by aninitial displacement estimate) is updated using theinitial value of DFD normalized by a measure of localpicture activity. In a second embodiment, the updateis a multiplicative function of DFD and the intensitygradient at the displaced location in the previous frame.