Two dimensional half-tone dot discrimination device

Details Two dimensional half-tone dot discrimination device Two dimensional half-tone dot discrimination device

1988-05-06

1991-01-08

Boudreau, Leo H.

Image analysis

Histogram processing

For setting a threshold

382 63, 358456, 358430, G06K 900

Patent

active

049842838

ABSTRACT:
An image area discriminating device for automatically discriminating whether each of the scanned areas of an input image information has been previously subjected to halftone dotting treatment or not. The image area discriminating device may be assembled in a digital copier or like apparatuses. In order to effect better processing of images born on respective areas of the document depending on the characteristics of individual images, the image area discriminating device is used to discriminate precisely and automatically whether the individual images in respective image areas are halftone images or binary-coded images, particularly whether or not the images have been previously subjected to halftone dotting treatment.

REFERENCES:
patent: 4144547 (1979-03-01), Stoffel
patent: 4554549 (1985-11-01), Ciardiello et al.
patent: 4559563 (1985-12-01), Joiner, Jr.
patent: 4707745 (1987-11-01), Sakano
patent: 4717964 (1988-01-01), Abe et al.

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