Image encoding apparatus sensitive to tone variations

Details Image encoding apparatus sensitive to tone variations Image encoding apparatus sensitive to tone variations

1992-08-13

1995-05-09

Coles, Sr., Edward L.

Facsimile and static presentation processing

Facsimile

Auxiliary signal

358429, 348420, H04N 1415

Patent

active

054145279

ABSTRACT:
An encoding system which prevents deterioration of a picture quality and provides a high encoding efficiency even when the size of a block is increased to enhance an encoding efficiency. An input image which is divided into blocks by a blocking unit, is supplied to a plurality of encoders which perform encoding in different numbers of tone levels respectively. Respective pieces of encoded image information from the respective encoders are supplied in common to a selector. A block classification unit determines the degree of the tone gradient of an input block and then outputs the classification result to the selector. The selector, in accordance with the block classification result, selects one of the respective pieces of the encoded image information and outputs the selected one as selected encoded image information. For example, when the tone varies greatly, there is selected the encoder which has a small number of tone levels and a high resolution.

REFERENCES:
patent: 5036391 (1991-07-01), Auvray et al.
patent: 5241395 (1993-08-01), Chen

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