Image analysis – Histogram processing – For setting a threshold
Patent
1990-02-05
1990-11-20
Moore, David K.
Image analysis
Histogram processing
For setting a threshold
382 50, 434112, 434113, 434114, G06K 938
Patent
active
049725017
ABSTRACT:
An image processing apparatus for reading an image pattern such as characters, graphics or the like written on a printed matter comprises: a lamp for illuminating such an image pattern; a photo-sensor as an image reading unit for converting the light reflected from the pattern to an electrical signal as multi-value digital data; a converter for converting the output data from the photo-sensor to a binary digital value on the basis of the maximum value and the minimum value of this data; and a control unit for controlling the photo-sensor so as to stabilize the binary output data from the converter on the basis of this output data. With this apparatus, the image pattern is converted to the mechanical vibrational pattern or enlarged display pattern due to the piezoelectric elements or LEDs, thereby enabling a blind person or person with poor vision to easily and certainly perceive the characters or graphic information on the printed matter.
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Sensory Aids Corporation, "Museum Accommodations for Visually Impaired People", Journal of Visual Impairment & Blindness, Sep. 1983, vol. 77, No. 7, 9/1983.
Canon Kabushiki Kaisha
Couso Jose L.
Moore David K.
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