Predictive encoder for still pictures

Details Predictive encoder for still pictures Predictive encoder for still pictures

1989-04-05

1990-07-10

Britton, Howard W.

Facsimile and static presentation processing

Facsimile

Recording apparatus

358133, H04N 1417

Patent

active

049410539

ABSTRACT:
A predictive encoder for still pictures comprises a quantizer (Q) whose characteristic curve is variable. The encoded picture data are read and transmitted at a constant bit rate from an output memory (PMUX). A subtractor (SR) and a picture memory (BS) are used for obtaining prediction values. In order to be able to transmit the still pictures from a video camera without any noticeable loss of quality, a first frame memory (V1) is provided in which the data of all pixels of the still picture to be transmitted are stored. A selection circuit (AS) adjusts the characteristic curve after the quantizer (Q) performs the quantizing operation. If the data stored in the first frame memory (V1) are transmitted several times, the selection circuit (AS) selects, for each encoding and transmission operation, a characteristic curve corresponding to a more refined quantizing operation than the characteristic curve which was used for the previous encoding and transmission operation.

REFERENCES:
patent: 4344086 (1982-08-01), Mizuno
patent: 4698672 (1987-10-01), Chen
patent: 4825285 (1989-04-01), Speidel

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