Image processing method and apparatus

Details Image processing method and apparatus Image processing method and apparatus

1994-05-17

1995-10-31

Rogers, Scott A.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358456, 358458, 358460, 358463, 358465, 358521, 358534, H04N 1405, H04N 1409

Patent

active

054634784

ABSTRACT:
An image processing apparatus prevents an increase in random noise and the like produced by distributing a transformation error, which is produced at the time of a level-number transformation, to unprocessed pixel data. Error data X.sub.n is added to pixel data, which has entered via an input unit, by an adder. Thereafter, the resulting data is subjected to a level-number transformation by a binarizing circuit. Transformation error produced at the time of the level-number transformation is calculated by an error arithmetic unit. The transformation error thus calculated is distributed to unprocessed pixel data by an error-diffusion unit, and the error is accumulated in a line buffer memory as error data. When processing of a prescribed number of lines has ended, a line-number discriminating circuit clears the error data that has been accumulated in the line buffer memory. As a result, an increase in random noise is prevented.

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