Dot region discriminating method

Details Dot region discriminating method Dot region discriminating method

1989-10-04

1991-06-18

Brinich, Stephen

Image analysis

Histogram processing

For setting a threshold

382 9, G06K 938

Patent

active

050254812

ABSTRACT:
A dot region discriminating method discriminates a dot region of an image which is described by a digital input image signal. The method includes detecting one or more extreme points from a first local region within the image. Each of the extreme points corresponds to a peak or valley of a density change of a picture element within the first local region. The method further comprises detecting whether or not one of (1) a center picture element within one of said local regions of the image or (2) one of the second local regions, belongs to a dot region, this second detecting step being based on a distribution of the extreme points detected in the first local region by the first detecting step. Finally, the method involves discriminating the dot region of the image based on the second detection step.

REFERENCES:
patent: 4403257 (1983-09-01), Hsieh
patent: 4503556 (1985-03-01), Scherl et al.
patent: 4741046 (1988-04-01), Matsunawa et al.
patent: 4760463 (1988-07-01), Nonoyama et al.
patent: 4817186 (1989-03-01), Goolsbey et al.
patent: 4856074 (1989-08-01), Nagaoka
patent: 4903145 (1990-02-01), Funada
patent: 4932065 (1990-06-01), Feldgajer
H. Ueno, "Reproduction of Dot Photograph by Dot Printer", (Oct. 1986), pp. 71-76, vol. 53, No. 4.

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