Image analysis – Histogram processing – For setting a threshold
Patent
1981-02-11
1983-08-09
Boudreau, Leo H.
Image analysis
Histogram processing
For setting a threshold
382 46, 382 62, G06K 950
Patent
active
043981771
ABSTRACT:
For formation of features for automatic character recognition an image pattern memory matrix corresponding to a respective character is read-out analogous to a sampling at different sampling angles with a multitude of section lines proceeding in accordance with said sampling angles. The evaluation per sampling angle ensues in such manner that there are determined and supplied to a classifier for character recognition the number of the section lines intersecting the character at least once (sampling range); the sum of all section line intersections; the center of gravity of the sampling range; and the scatter within the sampling range.
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patent: 4218673 (1980-08-01), Yoshida
patent: 4295120 (1981-10-01), Yoshida
Buyle-Bodin et al., "A Letter Encoder after Analysis of Geometrical Characters," Proc. of Conf. on Machine Perception of Patterns, Apr. 1972, pp. 216-222.
Ruppert, "Character Recognition Using Density Sums," IBM Tech. Disclosure Bulletin, vol. 18, No. 7, Dec. 1975, pp. 2190-2191.
Boudreau Leo H.
Computer Gesellschaft Konstanz mbH
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