Row-by-row segmentation and thresholding for optical character r

Details Row-by-row segmentation and thresholding for optical character r Row-by-row segmentation and thresholding for optical character r

1990-05-08

1992-01-14

Moore, David K.

Image analysis

Histogram processing

For setting a threshold

382 30, 382 51, 382 9, 358466, G06K 900

Patent

active

050816900

ABSTRACT:
During segmentation of individual characters in a column, the invention predicts for the next character an optimal minimum gray level sensitivity threshold while scanning pixel rows between characters by lowering the threshold unless or until noise in the image causes the scanner to detect too many "ON" pixels between adjacent numerals. During subsequent attempts to recognize the segmented character, the invention computes a confidence score and increases the sensitivity threshold above the predicted level if the confidence score is insufficient.

REFERENCES:
patent: 3263216 (1966-07-01), Andrews
patent: 3868637 (1975-02-01), Schiller
patent: 4490852 (1984-12-01), Sahni
patent: 4593325 (1986-06-01), Kannepell et al.
patent: 4607385 (1986-08-01), Meada
patent: 4731863 (1988-03-01), Sezan et al.
patent: 4742556 (1988-05-01), Davis, Jr. et al.
patent: 4829587 (1989-05-01), Glazer et al.
patent: 4931881 (1990-06-01), Matsui et al.

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