Adaptive quantizer

Details Adaptive quantizer Adaptive quantizer

1982-03-09

1984-08-21

Masinick, Michael A.

Facsimile and static presentation processing

Static presentation processing

Attribute control

358 13, H04N 932

Patent

active

044673469

ABSTRACT:
An adaptative quantizer for use with color images separates each color component for separate quantization and breaks up the input image into a plurality of blocks. A quantization characteristic determining unit determines the characteristic to be used for a given block according to the distribution of quantization level values obtained when an estimation error in a preceding block is quantized according to a particular quantization characteristic. The characteristic may be changed when the distribution of quantization level values is smaller than or exceeds given threshold values.

REFERENCES:
patent: 4133006 (1979-01-01), Iinuma
patent: 4141034 (1979-02-01), Netravali
patent: 4217609 (1980-08-01), Hatori
patent: 4255763 (1981-03-01), Maxemchuk
patent: 4366507 (1982-12-01), Mori
patent: 4394774 (1983-07-01), Widergren

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