Image analysis – Histogram processing – For setting a threshold
Patent
1991-07-01
1993-10-05
Moore, David K.
Image analysis
Histogram processing
For setting a threshold
358447, 358463, G06K 940, H04N 140
Patent
active
052512720
ABSTRACT:
A method and an apparatus for processing an image signal generated in an image reading apparatus comprising a light source for illuminating a document, an optical system, and an optical detector for detecting a light which is reflected at a reading point on the document and passes through the optical system and for outputting an image signal corresponding to an amount of light detected thereby are disclosed. A secondary light source effect function which describes a degree that a light reflected at each point other than the reading point on the document affects the image signal corresponding to the reading point is obtained. The image signal output from the optical detector is corrected based on the secondary light source effect function and an image signal corresponding to each point so that a component corresponding to a light which is reflected at each point other than the reading point and affects the image signal corresponding to the reading point is eliminated from the image signal.
REFERENCES:
patent: 4532548 (1985-07-01), Zwirn
patent: 4783839 (1988-11-01), Bamber
patent: 5065444 (1991-11-01), Garber
patent: 5153926 (1992-10-01), Jansson et al.
Hino Makoto
Takase Osamu
Johns Andrew W.
Moore David K.
Ricoh & Company, Ltd.
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