Title:
【発明の名称】文字認識方法
Document Type and Number:
Japanese Patent JP2643960
Kind Code:
B2
Abstract:
PURPOSE:To improve the character recognizing performance and processing speed of a character recognizing method when character recognition is performed by extracting feature vectors from a two-dimensional character picture by a giving a phase structure of white picture element to black picture elements on a outline in accordance with the inclination of the point. CONSTITUTION:Feature extracting points are set at A and B and the inclination of the outline passing the points A and B is first found by an outline tracing method, etc. Then the phase structure of white picture element which is the background of the character is fetched against the black picture elements at the points A and B. Since the normal vector at the point A is upward, scanning is made upward and the point, at which the scanning line meets the character line or circumscribed rectangle, is designated as A'. Then the point which divides the segment AA' into segments AA' and AA'' (AA':AA''=1:alpha) is designated as a complementary point A''. The alphais a constant with a value 0.3-0.5. Then the phase structure of the point A'' is found so as to find a feature vector. By giving the phase structure information of the background in such way, low-dimensional feature vectors, which are strong against deformation of characters and noises and for which less calculation is required, can be extracted effectively and the recognizing performance and processing speed can be improved.
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Inventors:
FUTAKI TOORU
Application Number:
JP31901087A
Publication Date:
August 25, 1997
Filing Date:
December 18, 1987
Export Citation:
Assignee:
KYANON KK
International Classes:
G06K9/62; G06K9/46; (IPC1-7): G06K9/62; G06K9/46
Attorney, Agent or Firm:
Yasunori Otsuka (1 person outside)