Image processing method and apparatus therefor

Details Image processing method and apparatus therefor Image processing method and apparatus therefor

1985-12-24

1988-11-08

Boudreau, Leo H.

Image analysis

Histogram processing

For setting a threshold

358283, 382 27, G06K 936

Patent

active

047838388

ABSTRACT:
An image processing method wherein a binary image is divided into blocks, at least one of the number of black picture elements and the number of white picture elements for each of the divided block of binary image are counted, and a tonal image is restored on the basis of the counted number from the binary image. An image processing apparatus for obtaining an expanded image or a contracted image by effecting a predetermined image processing for an image matrix consisting of binary data, having a device for instructing the gradation processing at the time of expanding or contracting the image, a device for instructing the kind of image pattern that is to be expanded or contracted, and a device for instructing the image gradation, wherein a predetermined image processing is effected depending upon these instructions.

REFERENCES:
patent: 4074231 (1978-02-01), Yajima et al.
patent: 4084196 (1978-04-01), Tisue et al.
patent: 4090188 (1978-05-01), Suga
patent: 4394693 (1983-07-01), Shirley
patent: 4524388 (1985-06-01), Abe et al.
patent: 4553173 (1985-11-01), Kawamura
patent: 4610026 (1986-09-01), Tabata et al.
patent: 4651293 (1987-03-01), Kato

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