Control of an encoding parameter according to a ratio of a movin

Details Control of an encoding parameter according to a ratio of a movin Control of an encoding parameter according to a ratio of a movin

1989-10-30

1990-11-13

Shepperd, John W.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358105, H04N 718, H04N 712

Patent

active

049705911

ABSTRACT:
In an encoding device including a frame memory for memorizing an input moving picture signal as a memorized moving picture signal frame by frame and an encoding unit for encoding the memorized moving picture signal by using an encoding parameter, a control unit controls the parameter in compliance with a ratio which a moving picture area has relative to a frame picture represented by each frame of the input moving picture signal. The parameter should be fine and coarse when the ratio is small and great, respectively. As usual, a buffer memory of the encoding unit produces an amount signal indicative of an extent to which the buffer memory is full. Preferably, the control unit suspends encoding operation during a succeeding one of two successive frames when the amount signal indicates that the buffer memory became full in a preceding one of the two successive frames. The control unit makes the frame memory keep a frame of the memorized moving picture signal while suspending the encoding operation. If desired, the control unit controls the parameter additionally in compliance with a bit rate at which the encoding unit produces an encoded picture signal.

REFERENCES:
patent: 4689672 (1987-08-01), Furukawa et al.
patent: 4722003 (1988-01-01), Kondo
patent: 4729021 (1988-03-01), Kondo
patent: 4887156 (1989-12-01), Ohki
patent: 4901149 (1990-02-01), Fernando et al.

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