Image analysis – Histogram processing – For setting a threshold
Patent
1985-09-03
1988-06-14
Boudreau, Leo H.
Image analysis
Histogram processing
For setting a threshold
358285, 382 48, G06K 922
Patent
active
047517433
ABSTRACT:
An optical character reader which digitizes analog electrical signals obtained by scanning through an image sensor characters or symbols entered on a sheet so that a discrimination circuit recognizes the characters or the like on the basis of the digital signals. The discrimination circuit is controlled by sheet detection signals for indicating that the image-formation picture of the image sensor is positioned so as to completely mate with the sheet, the characters or the like being read only when the image-formation picture is positioned so as to completely mate with the sheet. In order to detect that the image-formation picture is positioned so as to completely mate with the sheet a base having a reflection factor lower than that of the sheet is used for fixing the sheet so as to thereby utilize a difference between the reflection factors of the sheet and the base. Thus, when the image-formation picture is positioned even in part corresponding to the base, a form detection signal is adapted not provided whereby the discrimination circuit does not mistakenly read the edge of the sheet.
REFERENCES:
patent: 3160853 (1964-12-01), Howard
patent: 3274550 (1966-09-01), Klein
patent: 3918028 (1975-11-01), Humphrey et al.
patent: 4143358 (1979-03-01), Neff
patent: 4356473 (1982-10-01), Freudenthal
patent: 4571055 (1986-02-01), Nishiyama
patent: 4630127 (1986-12-01), Fuwa
Boudreau Leo H.
Sumitomo Electric Industries Ltd.
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