Image analysis – Histogram processing – For setting a threshold
Patent
1987-09-30
1989-02-07
Boudreau, Leo H.
Image analysis
Histogram processing
For setting a threshold
382 59, 382 61, 358280, 178 18, G06K 982, G06K 922
Patent
active
048037370
ABSTRACT:
A novel digitizer operable on an optical digitization basis comprises a transparent flat plate as a light active surface located on a graphic data recording medium, and a cursor functioning as an optical recognition device movable on the transparent flat plate. A predetermined coordinate correlative pattern is described on or in the transparent flat plate with a fluorescent paint. The cursor comprises a positioning arm provided on the outer periphery thereof to visually trace a data location on the recording medium in accordance with a movement of the cursor to effect positioning of the cursor with respect to the data location, an optical system including a light source, an optical filter assembly, and a light focusing lens etc., and a CCD sensor unit to sense light emitted from a partial pattern which falls within a predetermined limited visual range of the pattern. By irradiation of the pattern, fluorescent light is emitted therefrom. The optical digitizer is operative to determine position coordinates of a graphic data on the recording medium in accordance with an projected image of fluorescent light sensed by the sensor unit. Thus, such an implementation makes it possible to realize a small-sized, high accuracy digitizer completely free from influence of electromagnetic wave noise.
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Ichinokawa Kazuo
Sato Yoichi
Boudreau Leo H.
Daley Donald J.
NEC Corporation
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