Apparatus for performing gradation processing on image data

Details Apparatus for performing gradation processing on image data Apparatus for performing gradation processing on image data

1990-04-26

1992-06-09

Moore, David K.

Image analysis

Histogram processing

For setting a threshold

382 52, 382 53, 358464, 358466, G06K 938

Patent

active

051214474

ABSTRACT:
Image processing apparatus having an input device for inputting the data of an objective pixel, calculator for obtaining an average density value in a specified region and a quantizer for quantizing the data of the objective pixel based on the average density value. The entire image including its edge being effectively binarized and during serial scanning of the data continuity not being lost at the connection of scans, thereby obtaining an image with excellent gradation and resolution.

REFERENCES:
patent: 4554593 (1985-11-01), Fox et al.
patent: 4577235 (1986-03-01), Kannapell et al.
patent: 4709274 (1987-11-01), Tanioka
patent: 4893188 (1990-01-01), Murakami et al.
patent: 4969052 (1990-11-01), Ishida et al.
patent: 4975786 (1990-12-01), Katayama et al.

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