CHARACTER RECOGNITION DEVICE, RECOGNITION DICTIONARY GENERATION DEVICE AND NORMALIZATION METHOD

PROBLEM TO BE SOLVED: To normalize a plurality of input images with different size so that variation in the shape among the same characters becomes small in order to raise accuracy of character identification.SOLUTION: Preprocessing for reducing disturbance factors from input images is executed, con...

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Bibliographische Detailangaben
Hauptverfasser: MIYOSHI TOSHINORI, SHINJO HIROSHI, TSUTSUMI YASUTAKA, NAGASAKI TAKESHI
Format: Patent
Sprache:eng
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Zusammenfassung:PROBLEM TO BE SOLVED: To normalize a plurality of input images with different size so that variation in the shape among the same characters becomes small in order to raise accuracy of character identification.SOLUTION: Preprocessing for reducing disturbance factors from input images is executed, contours of the images to which the preprocessing is executed are extracted, the images to which the preprocessing is executed are synthesized with the images of the extracted contours, mapping from the synthesized image to normalized images with predetermined size are generated so that an image of the center of gravity of the synthesized image approaches the center of a range of the predetermined size, and an image within a range to which pixels of the synthesized image spread approaches the range of the predetermined size, the images to which the preprocessing is executed are normalized according to the generated mapping, the normalized images are converted into vector values on a vector space, the vector values are determined that they are any characters based on a recognition dictionary stored in a storage device, and a result of determination is output.