Facsimile and static presentation processing – Static presentation processing – Attribute control
Patent
1989-12-20
1991-01-22
Britton, Howard W.
Facsimile and static presentation processing
Static presentation processing
Attribute control
358 29, G03F 308, H04N 146, H04N 973
Patent
active
049874853
ABSTRACT:
An image reading apparatus in accordance with the present invention reads a color image to separate the image into three primary colors by an image sensor and outputs image data corresponding to each of the colors. This image reading apparatus comprises a scanning device for making the image sensor relatively scan for a reference chart and an original, an A/D converter for converting an output of the image sensor into digital data corresponding to each of the primary colors, an operation device for evaluating correction data of each color from the output of the image sensor generated when the image sensor scans the reference chart, a multiplier for multiplying the digital data of each color by the correction data evaluated, an adder for adding a result of the multiplication and digital data before being multiplied, a shading correction circuit provided at a succeeding stage of the adder, and a line memory provided at a succeeding stage of the shading correction circuit.
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patent: 4523229 (1985-06-01), Kanmoto
patent: 4554583 (1985-11-01), Saitoh et al.
patent: 4577218 (1986-03-01), Kurata
patent: 4679073 (1987-07-01), Hayashi
patent: 4734762 (1988-03-01), Aoki et al.
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Britton Howard W.
Minolta Camera Kabushiki Kaisha
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