Motion detection for interlaced video
First Claim
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1. 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).
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Abstract
Motion detection in interlaced video fields, as useful in de-interlacing, includes spatial-temporal maximum filtering, temporal IIR filtering dependent upon spatial-temporal variance, and spatial variance dependent moving-still interpolation blending factor.
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Citations
13 Claims
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1. A method of motion detection for interlaced fields, comprising the steps of:
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(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). - View Dependent Claims (2, 3, 4, 5, 6)
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7. A method of video de-interlacing, comprising the steps of:
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(a) detecting motion for a pixel (x,y) of parity differing from the parity of a first field; (b) computing a value for said pixel (x,y) as a blend of a spatial interpolation for said pixel (x,y) and a temporal interpolation for said pixel (x,y) where said blend depends upon said motion detection; (c) wherein said detecting motion includes (i) 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 pixels in the field following said first field;
(ii) 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
(iii) computing an output motion measure for said pixel (x,y) from said second motion measure for said pixel (x,y). - View Dependent Claims (8, 9, 10, 11, 12, 13)
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Specification