Movement compensation predictive encoder for a moving picture si

Details Movement compensation predictive encoder for a moving picture si Movement compensation predictive encoder for a moving picture si

1986-06-10

1987-08-25

Britton, Howard W.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358105, H04N 7137

Patent

active

046896732

ABSTRACT:
In a movement compensation predictive encoder, a vector detector (19) is supplied with a moving picture signal and produces a movement vector signal representative of at least one movement vector for each region of each frame. A picture analyzer (16) serves as a variation detector for detecting a variation in each region to produce a variation signal when the variation exceeds a predetermined threshold in one of the regions. The variation signal is used in giving a predetermined value, such as zero, to the above-mentioned at least one movement vector for that one of the regions. In place of the variation detector, a scene change detector can likewise be used to produce a scene change signal for giving a predetermined value to the movement vectors for a frame for which a scene change is detected. The scene change detector is preferably operable on a summation for each frame of results of evaluation for movement compensated prediction errors rather than, as in prior art, for differences between picture elements of two consecutive frames.

REFERENCES:
patent: 4460923 (1984-07-01), Hirano
patent: 4494144 (1985-01-01), Brown
patent: 4575756 (1986-03-01), Furukawa
patent: 4591907 (1986-05-01), Catros
patent: 4636862 (1987-01-01), Hatori

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