On-line recognition method and apparatus for a handwritten patte

Details On-line recognition method and apparatus for a handwritten patte On-line recognition method and apparatus for a handwritten patte

1984-12-24

1987-03-24

Birmiel, Howard A.

Image analysis

Histogram processing

For setting a threshold

382 3, 382 22, G06K 962

Patent

active

046531076

ABSTRACT:
Coordinates of a handwritten pattern drawn on a tablet are sequentially sampled by a pattern recognition unit to prepare pattern coordinate data. Based on an area encircled by segments created by the sampled pattern coordinate data of one stroke and a line connecting a start point and an end point of the one-stroke coordinate data, the sampled pattern coordinate data of the one stroke is converted to a straight line and/or curved line segments. The converted segments are quantized and normalized. The segments of the normalized input pattern are rearranged so that the input pattern is drawn in a predetermined sequence. Differences between direction angles for the rearranged segments are calculated. Those differences are compared with differences of the direction angles of the dictionary patterns read from a memory to calculate a difference therebetween. The matching of the input pattern and the dictionary pattern is determined in accordance with the difference. If the matching fails, the first or last inputted segment of the input pattern is deleted or the sampled pattern coordinate data of the next stroke is added, to continue the recognition process.

REFERENCES:
patent: 4317109 (1982-02-01), Odaka et al.
patent: 4365235 (1982-12-01), Greanias
patent: 4542412 (1985-09-01), Fuse et al.
patent: 4553258 (1985-11-01), Chainer
patent: 4573196 (1986-02-01), Crane et al.

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