Shading correcting method in image reading device

Details Shading correcting method in image reading device Shading correcting method in image reading device

1990-12-31

1992-01-28

Groody, James J.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358475, H04N 140

Patent

active

050847724

ABSTRACT:
An original document image is irradiated with light emitted from a light source, and light reflected from or passed through the original document image is applied to a line sensor for reading the image. A maximum output value of the line sensor is determined within a linear characteristic region thereof with respect to the amount of exposure of the line sensor to the light reflected from or passed through the original document image. The amount of light emitted from the light source is regulated within the maximum output value to determine a sensitivity correcting value for the line sensor with respect to a reference object, and the sensitivity correcting value is stored as corrective data. An image signal from the line sensor is corrected with the corrective data when the original document image is read.

REFERENCES:
patent: 4158859 (1979-06-01), Kerbel
patent: 4408231 (1983-10-01), Bushaw et al.
patent: 4520395 (1985-05-01), Abe
patent: 4618254 (1986-10-01), Therrien et al.
Dattilo et al., "Variable Intensity Illumination Scanner Calibration System", IBM Technical Disclosure Bulletin, vol. 21, No. 9, Feb. 1979, pp. 3546-3547.

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