Image processing system using a feature point-based motion estim

Details Image processing system using a feature point-based motion estim Image processing system using a feature point-based motion estim

1995-09-13

1997-04-29

Britton, Howard W.

Television

Bandwidth reduction system

Data rate reduction

348699, H04N 736

Patent

active

056254172

ABSTRACT:
An apparatus, for use in a motion-compensated video signal encoder, for determining a predicted current frame based on a current and a previous frame, includes: a feature point motion vector(MV) detector for detecting a first set of MVs for feature points and a second set of MVs for edge points in the previous frame; a quasi-point detector for detecting quasi-feature points and a third set of MVs therefor, and quasi-edge points and a fourth set of MVs therefor; a non quasi-point MV detector for determining a quasi-feature point range for each of the quasi-feature points by indexing each of non-quasi-points to its closest quasi-feature point, and detecting a distance between a quasi-feature point and each of the remaining pixels in a quasi-feature point range and setting the distance as a search radius for the remaining pixel, and determining one or more quasi-feature point ranges dispersed within the search radius from each of the remaining pixels, and detecting a fifth set of MVs for the remaining pixels, each of the fifth set of MVs being determined by averaging motion vectors of the quasi-feature points included in the one or more quasi-feature point ranges; and a motion compensator for compensating the previous frame with the third, fourth and fifth sets of MVs.

REFERENCES:
patent: 5546129 (1996-08-01), Lee

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