Image analysis – Pattern recognition – Feature extraction
Patent
1997-11-21
1998-11-24
Couso, Von J.
Image analysis
Pattern recognition
Feature extraction
382201, G06K 946
Patent
active
058419063
ABSTRACT:
A graphic form recognition apparatus which can extract a singular point of a curved line portion precisely is disclosed. The apparatus comprises a coordinate point string reading section for reading in a string of coordinate points of a graphic form of lines inputted from an inputting apparatus, a storage apparatus for storing the string of coordinate points thus read in, a distance thinning out or deletion section for thinning out or deleting points of the string of coordinate points at a fixed distance, an elevation angle calculation section for calculating angles of elevation provided by the remaining coordinate point string, an elevation angle most frequent value calculation section for calculating a most frequent value which appears most frequently among all of the thus calculated angles of elevation, a difference calculation section for calculating differences between the angles of elevation and the most frequent value, and a recognition section for recognizing each coordinate point, at which the difference of the angle of elevation from the most frequent value is higher than a predetermined value, as a singular point of the inputted graphic form of lines.
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Couso Von J.
NEC Corporation
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