Color image reading apparatus with white balance system for cont

Details Color image reading apparatus with white balance system for cont Color image reading apparatus with white balance system for cont

1983-10-21

1987-07-07

Groody, James J.

Facsimile and static presentation processing

Static presentation processing

Attribute control

358 29, 358 75, G03F 308, H04N 146, H04N 973

Patent

active

046790730

ABSTRACT:
In a color image reading apparatus, a CCD line image sensor reads a color document illuminated by a light source three times in succession through red, green and blue filters to produce red, green and blue color component signals. Prior to reading the color document, the line sensor reads a standard reference area illuminated by the light source to produce red, green and blue reference color component signals. The intensity of the light source is adjusted so that the level of the reference color component signals is equal to a predetermined value. Red, green and blue control signals corresponding to the light intensities at which the levels of the red, green and blue reference color component signals are equal to the predetermined value are stored. These stored control signals are used to control the intensity of the light source while the line sensor reads the document to produce the red, green and blue color component signals. The standard reference area may be a white area, or may be made up of separate red, green and blue areas.

REFERENCES:
patent: 3898006 (1975-08-01), Kimura et al.
patent: 4136360 (1979-01-01), Hoffrichter et al.
patent: 4454532 (1984-06-01), Itani et al.
patent: 4523229 (1985-06-01), Kanmoto
patent: 4524388 (1985-06-01), Abe et al.

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