Image reading apparatus having improved shading correction

Details Image reading apparatus having improved shading correction Image reading apparatus having improved shading correction

1991-09-12

1993-10-12

Coles, Sr., Edward L.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358475, 358474, H04N 140

Patent

active

052530833

ABSTRACT:
An image reading apparatus according to the present invention includes: an image reading apparatus including a plurality of image reading elements; a reference image reading apparatus for reading a reference image by using the image reading apparatus; a smoothing apparatus for smoothing reference image data read by the reference image reading apparatus; an original image reading apparatus for reading an original image by using the image reading apparatus; and an original data correcting apparatus for correcting original data read by the original image reading apparatus on the basis of the smoothed reference image data.

REFERENCES:
patent: 4691365 (1987-09-01), Nagashima
patent: 4806780 (1989-02-01), Yamamoto et al.
patent: 4987485 (1991-01-01), Hirota

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