Motion compensated video standards converter and method of deriv

Details Motion compensated video standards converter and method of deriv Motion compensated video standards converter and method of deriv

1991-06-12

1993-05-04

Peng, John K.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358105, 358136, H04N 701, H04N 718, H04N 712

Patent

active

052086674

ABSTRACT:
In, for example, a motion compensated video standards converter wherein blocks in a first field or frame of a video signal are each compared with a plurality of blocks in the following field or frame of the video signal for deriving motion vectors representing the motion of the content of respective blocks between the first field or frame and the following field or frame, and wherein a correlation surface is generated for each block in the first field or frame, the correlation surface representing the difference between the content of the first block in the first field or frame and the content of each block in the following field or frame with which it has been compared; the minimum difference represented by the correlation surface and differing from the next smallest difference represented by the correlation surface by more than a predetermined threshold value is found to derive a motion vector, the number of motion vectors so derived is averaged (62) over a predetermined number of fields or frames, and the threshold value is varied (67, 68, 69) in dependence on the average.

REFERENCES:
patent: 4890160 (1989-12-01), Thomas
patent: 4974084 (1990-11-01), Fernando
patent: 5012336 (1991-04-01), Gillard
patent: 5012337 (1991-04-01), Gillard
patent: 5025495 (1991-06-01), Avis
patent: 5027203 (1991-06-01), Samad et al.
patent: 5099325 (1992-03-01), Artieri et al.

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