Image binarization apparatus and method of it

Details Image binarization apparatus and method of it Image binarization apparatus and method of it

1996-06-21

1998-07-21

Coles, Sr., Edward L.

Image analysis

Image enhancement or restoration

Variable threshold, gain, or slice level

382271, 358466, H04N 140

Patent

active

057845000

ABSTRACT:
A binarization circuit compares the density value of the target pixel with the density value of surrounding pixels in the vicinity. A judging unit judges whether or not the target pixel is isolated from the surrounding pixels. A detection unit detects the density values of the target pixels which make the target pixels isolated by a binarization process. A calculation unit calculates the accumulated isolated pixel frequencies of each density value detected by the detecting function when the judging unit and the detecting unit have finished processing all of the original image. A determination unit determines a threshold value on the basis of the accumulated isolated pixels frequencies.

REFERENCES:
patent: 4656665 (1987-04-01), Pennebaker
patent: 4982294 (1991-01-01), Morton et al.
patent: 5130821 (1992-07-01), Ng
patent: 5140444 (1992-08-01), Klein et al.
patent: 5410418 (1995-04-01), Yonezawa
patent: 5563721 (1996-10-01), Overton

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