Reducing the effects of noise in level number transformation

Details Reducing the effects of noise in level number transformation Reducing the effects of noise in level number transformation

1995-06-05

1997-04-15

Peng, John K.

Television

Image signal processing circuitry specific to television

Noise or undesired signal reduction

348607, 348571, 348671, 358455, 358463, 358521, 358534, H04N 521

Patent

active

056214766

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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