Image analysis – Histogram processing – For setting a threshold
Patent
1986-10-03
1988-07-12
Groody, James J.
Image analysis
Histogram processing
For setting a threshold
382 21, G06K 946, G06K 948
Patent
active
047575514
ABSTRACT:
A character recognition system includes a scanner for scanning a character to be processed to produce a character data, which is processed in a predetermined manner to extract a character feature, preferably contour information of the character. Preferably, a plurality of predetermined directionality codes each associated with a unique pixel arrangement pattern are prepared and they are assigned to the contour depending on the local pixel arrangement condition. The contour information defined by such directionality codes is further processed to define a histogram or feature vector of the directionality codes which is compared with a first group of reference characters without inclination and a second group of reference characters with inclination. When a predetermined condition is met, then the mode of operation is switched such that an unknown character is compared with only one of the first and second groups of reference characters.
REFERENCES:
patent: 3609685 (1971-09-01), Deutsch
Glucksman; "Multicategory Classification of Patterns Represented by High-Order Vectors of Multilevel Measurements"; IEEE Transactions on Computers; 12-1971, pp. 1593-1598.
Kobayashi Kiyohiko
Sakurai Akira
Sato Gen
Groody James J.
Parker Michael D.
Ricoh & Company, Ltd.
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