Binarizing apparatus

Details Binarizing apparatus Binarizing apparatus

1987-05-15

1990-02-20

Boudreau, Leo H.

Image analysis

Histogram processing

For setting a threshold

382 50, 358464, G06K 938

Patent

active

049033166

ABSTRACT:
A binarizing apparatus used for optical character readers or character-and-graphic input devices, in which a sharp binary image can be obtained even from low-contrast character lines (or line segments) by discriminating a line graphic from stains wider than the character lines or from blurs in the background thereof. Eight surrounding subwindows are disposed around a target subwindow enclosing a target pixel, the surrounding subwindows being separated from each other at a distance larger than the character line width, and each of the subwindows having 3.times.3 pixels. The average density value of the respective subwindow is calculated to thereby compare the respective density values of the target subwindow and each surrounding subwindow or compare the density values of the respective surrounding subwindows. Consequently, whether the target pixel belongs to character line or whether it does not belong thereto, is judged to thereby perform binarizing.

REFERENCES:
patent: 4238768 (1980-12-01), Mitsuya et al.
patent: 4342051 (1982-07-01), Suzuki et al.
patent: 4521773 (1985-06-01), Lyon
patent: 4562486 (1985-12-01), Suzuki et al.
patent: 34578712 (1986-03-01), Matsunawa
patent: 4586089 (1986-04-01), Nakazato et al.
English language abstract of Japanese Patent Publication No. 158032/85, Hongo, Yasuo, "Binary Coding Device", 7/19/85.

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