Optical character recognition by forming and detecting matrices

Details Optical character recognition by forming and detecting matrices Optical character recognition by forming and detecting matrices

1986-10-29

1990-01-02

Boudreau, Leo H.

Image analysis

Histogram processing

For setting a threshold

382 25, 382 34, G06K 962

Patent

active

048917508

ABSTRACT:
An alphanumeric character is recognized by optically scanning that character, detecting the occurrence of predetermined geographical features in the scanned image, comparing the detected geographical features to a store of particlar geographical features which identify respective alphanumeric characters, and identifying the scanned image as the alphanumeric character having those geographical features to which the detected geographical features favorably compare. The aforementioned geographical features comprise lagoons (formed as enclosed areas) and bays (formed as open areas). A matrix representing the juxtapositions of the detected geographical features is generated and compared with stored predetermined matrices which, in turn, represent predetermined characters.

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King-Sun Fu, "Synthetic Pattern Recognition" Chapter 4, Handbook of Pattern Recognition and Image Processing, Academic Press Inc., 1986, pp. 85-102.
Beun, "A Flexible Method for Automatic Reading of Handwritten Numerals", Philips Technical Review, vol. 33, 1973, No. 4, pp. 89-101.
Sakai et al., Extraction of Invarient Picture Sub-Structures by Computer, Computer Graphics and Image Processing, (1972), pp. 81-96.
Tour et al., "Recognition of Handwritten Characters by Topological Feature Extraction and Multilevel Categorization" IEEE Transactions on Computers, Jul. 1972, pp. 776-782.

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