Shading elimination device for image read-out apparatus

Details Shading elimination device for image read-out apparatus Shading elimination device for image read-out apparatus

1986-08-22

1988-03-29

Coles, Sr., Edward L.

Facsimile and static presentation processing

Facsimile

Recording apparatus

358282, 358163, H04M 140

Patent

active

047347830

ABSTRACT:
A shading elimination device comprises a memory for storing characteristics of shading in an image read-out apparatus, a sensitivity adjuster for adjusting the sensitivity of a photodetector of the image read-out apparatus or an image density adjuster for adjusting the density of an image reproduced by an image reproducing apparatus, and a control circuit. The control circuit receives a signal representing the shading characteristics from the memory, and controls the sensitivity adjuster or the image density adjuster to eliminate changes in the output of the photodetector caused by shading in the image read-out apparatus.

REFERENCES:
patent: 4523229 (1985-06-01), Kammioto
patent: 4524388 (1986-06-01), Abe et al.
patent: 4544952 (1986-10-01), Cang
patent: 4633314 (1986-12-01), Furata et al.

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