Patent ID: 8582032

Claim:
A method of motion detection for interlaced fields, comprising the steps of: (a) for a pixel (x,y) of parity differing from the parity of a first field, computing a first motion measure for said pixel (x,y) from differences between the values of pixels in a neighborhood of (x,y) in the field preceding said first field and the values of corresponding neighborhood pixels in the field following said first field; (b) filtering said first motion measure for said pixel (x,y) to give a second motion measure for said pixel (x,y) wherein said filtering includes texture-adaptive spatial-temporal filtering and an infinite-impulse-response (IIR) filtering with filter coefficient adapting to a measure of spatial-temporal variance about said pixel (x,y) for capturing fast and periodic motion in interlaced video sequence, wherein the IIR filtering is reset at video scene changes when a level of difference between two neighboring fields with the same parity is greater than a threshold; and (c) computing an output motion measure for said pixel (x,y) from said second motion measure for said pixel (x,y).