Shading elmination method for an image read-out apparatus

Details Shading elmination method for an image read-out apparatus Shading elmination method for an image read-out apparatus

1989-08-10

1991-01-15

Fields, Carolyn E.

Radiant energy

Automatic/serial detection of similar sources

358163, G01N 2304

Patent

active

049856294

ABSTRACT:
Shading is eliminated in an image read-out apparatus wherein a light beam is deflected by a rotating polygon mirror which has a plurality of reflecting surfaces, a surface which has an image recorded thereon is two-dimensionally scanned with the deflected light beam, and light which is emitted by the scanned surface and which carries information about the image is detected and converted into an image signal by a photoelectric read-out device. The shading elimination method comprises the steps of storing the characteristics of the shading with respect to the respective reflecting surfaces, the shading being caused by nonuniformity in the intensity of the light beam, nonuniformity in the speed at which the surface is scanned with the light beam, nonuniformity in how the photoelectric read-out device, detects light which is emitted by said surface, or the like. Fluctuations in the image signal, which are caused by the shading, are eliminated with respect to the respective reflecting surfaces on the basis of the shading characteristics which correspond to the respective reflecting surfaces.

REFERENCES:
patent: 3800078 (1974-03-01), Cochran et al.
patent: 3800079 (1974-03-01), McNeil et al.
patent: 4642462 (1987-02-01), Aagano et al.
patent: 4734783 (1988-03-01), Horikawa
patent: 4860116 (1989-08-01), Nakajima
patent: 4885467 (1989-12-01), Horikawa

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