Adaptive type quantizer

Details Adaptive type quantizer Adaptive type quantizer

1981-03-16

1983-05-31

Orsino, Jr., Joseph A.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358260, 375 30, H04N 712

Patent

active

043863663

ABSTRACT:
A method for adaptively equalizing sampled input picture element values in which an estimation error obtained from a sampled input picture element value and the estimation value thereof are adaptively quantized by selecting one of a plurality of quantization characteristics. Quantization steps are determined in accordance with the desired quantization characteristics. Input groups of picture elements are divided into adjacent blocks and a quantization characteristic used for succeeding blocks is determined according to the distribution of quantization level values of preceding blocks. A quantization characteristic selecting unit selects a quantization characteristic set by the quantization characteristic determining unit from among a plurality of quantization characteristics. The estimation errors are quantized in a predetermined block using the quantization characteristic which is so selected.

REFERENCES:
patent: 2916553 (1959-12-01), Crowley
patent: 4179710 (1979-12-01), Ishigoro et al.
patent: 4292651 (1981-09-01), Kretz et al.

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