Image reading apparatus and method including an illuminating con

Details Image reading apparatus and method including an illuminating con Image reading apparatus and method including an illuminating con

1996-02-26

1998-04-07

Coles, Sr., Edward L.

Facsimile and static presentation processing

Facsimile

Picture signal generator

358509, 358486, 358464, 399 17, 362276, H04N 104, H04N 146, H04N 138, F21V 0000

Patent

active

057370958

ABSTRACT:
An image reading apparatus includes a plurality of light sources for illuminating an original, a photoelectric conversion device for converting light from the original illuminated by each of the plurality of illuminating means, and a discriminating circuit for discriminating whether or not any image exists on the original, based on image signals output from the photoelectric conversion device at least when the original is illuminated with light from one of the light sources, which possesses spectral characteristics including green. A control circuit controls the apparatus so that, when the discriminating circuit has determined that no image exists on the original, the manner of reading of the image with the light sources other than the light source employed in the discrimination performed by the discriminating circuit is changed from the manner of reading of the image with the light source employed in the discrimination.

REFERENCES:
patent: 3646256 (1972-02-01), Jacob et al.
patent: 3670099 (1972-06-01), Oliver
patent: 3730988 (1973-05-01), Shimizu
patent: 4356516 (1982-10-01), Koguchi
patent: 4839740 (1989-06-01), Yoshida
patent: 5021877 (1991-06-01), Tsuchiya et al.
patent: 5502542 (1996-03-01), Takano
patent: 5650863 (1997-07-01), Utagawa et al.

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