Adaptive predictive encoding and/or decoding apparatus

Details Adaptive predictive encoding and/or decoding apparatus Adaptive predictive encoding and/or decoding apparatus

1984-09-04

1986-12-30

Groody, James J.

Facsimile and static presentation processing

Facsimile

Recording apparatus

358263, 358133, 358 13, 375 27, H04N 100, H04N 712

Patent

active

046333258

ABSTRACT:
An adaptive predictive encoding apparatus generates predictive values P.sub.1, P.sub.2, . . . , P.sub.n with respect to a quantized value X of a picture element x. Predictive error signals Y.sub.1, Y.sub.2, . . . , Y.sub.n are obtained from the quantized value X and the predictive values P.sub.1, P.sub.2, . . . , P.sub.n. A prediction selection circuit determines the number of mis-predictions from each of the predictive error signals for scanned picture elements. A selection signal M is produced indicating the prediction error signal Y with the least number of mis-predictions, the selection signal controlling a selector to provide the prediction error signal Y in response to the selection signal M. The selected predictive error signal Y is encoded to produce an encoded signal. An adaptive predictive decoding apparatus which decodes the encoded selected predictive error signal is also disclosed.

REFERENCES:
patent: 4141034 (1979-02-01), Natravali et al.
patent: 4144547 (1979-03-01), Stoffel
patent: 4193096 (1980-03-01), Stoffel
patent: 4470072 (1984-09-01), Tamaka et al.

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