Method and apparatus for reading color images using a plurality

Details Method and apparatus for reading color images using a plurality Method and apparatus for reading color images using a plurality

Filed on

1984-04-11

Date issued

1987-03-24

Examiner

Groody, James J.

Patent Class

Facsimile and static presentation processing

SubClass

Static presentation processing

SubSubClass

Attribute control

Other Related Categories

358 41, 358 80, 250226, 356402, 356407, 356425, H04N 146, H04N 904, G03F 308, G01N 2125

Type

Patent

Status

active

Patent number

046529136

Description

ABSTRACT:
In a method and an apparatus for reading a color image wherein the color image is illuminated and scanned by light from a plurality of light sources having different spectral properties to read the color image on the basis of the reflected light therefrom, at least one light source of the light sources is kept turned on during the scanning operation of the color image, thereby eliminating any problems resulting from its after-glow; and at least one light source of the light sources other than that kept turned on is repeatedly turned on and off with a period corresponding to the period of the scanning operation so as to project the light from the single and plural light sources selected from the light sources, at least once respectively, upon the scanned portions of the color image. The color image is read by detecting colors on the scanned portions of the color image on the basis of levels of the light reflected from the color image. A variety of colors may be detected by the present invention including red, blue, black and cyan. In addition, the present invention also teaches the use of color filters to eliminate the potential after-glow effect of color fluorescent lamps.

REFERENCES:
patent: 4085421 (1978-04-01), Gilmour
patent: 4318122 (1982-03-01), White
patent: 4519703 (1985-05-01), Lehman et al.

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