Compression coding device and expansion decoding device for a pi

Details Compression coding device and expansion decoding device for a pi Compression coding device and expansion decoding device for a pi

1989-12-01

1992-12-08

Ng, Jin F.

Facsimile and static presentation processing

Facsimile

Auxiliary signal

358426, 358432, H04N 1415

Patent

active

051702649

ABSTRACT:
A picture data compression coding device sets a normalizing coefficient which matches a block of picture data and normalizes the picture data by the normalizing coefficient, whereby an adequate compression ratio is selected on a block-by-block basis. The coding device sets a normalizing coefficient in response to the sum of activities of individual blocks and normalizes picture data by the normalizing coefficient, thereby maintaining the amount of coded data constant at all times. Further, the coding device normalizes picture data by multiplying them by a reciprocal of the normalizing coefficient so as to eliminate the need for a divider. A decoding device decodes the data having been coded by the coding device.

REFERENCES:
patent: 4780761 (1988-10-01), Daly et al.
patent: 4920414 (1990-04-01), Remus et al.
patent: 4933761 (1990-06-01), Murakami et al.
patent: 4933763 (1990-06-01), Chantelou
patent: 4982282 (1991-01-01), Saito et al.

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