Shading elimination method for image read-out apparatuses

Details Shading elimination method for image read-out apparatuses Shading elimination method for image read-out apparatuses

1992-04-15

1993-11-30

Dzierzynski, Paul M.

Radiant energy

Source with recording detector

Using a stimulable phosphor

358163, G01N 2304

Patent

active

052668045

ABSTRACT:
A surface, on which uniform information has been recorded, is two-dimensionally scanned with light beam deflected by a rotating polygon mirror having reflecting surfaces. Light radiated out of the scanned surface is photoelectrically detected, and groups of reference signal components for correcting purposes are thereby obtained, each group corresponding to one reflecting surface. Each time the groups of reference signal components for correcting purposes, which groups correspond to the whole reflecting surfaces, are obtained while the rotating polygon mirror rotates one turn, an averaging process is carried out on these groups of reference signal components for correcting purposes. A group of correction signal components are generated from a group of reference signal components for correcting purposes, which have been obtained from the averaging process. After an image signal is detected from a surface having an image recorded thereon, each group of image signal components of the image signal corresponding to one reflecting surface are corrected with the group of correction signal components. An averaging process is then carried out on the groups of image signal components of the image signal, which correspond to the whole reflecting surfaces and which have thus been corrected.

REFERENCES:
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patent: 4734783 (1988-03-01), Horikawa
patent: 4763201 (1988-08-01), Sakamoto
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patent: 4885467 (1989-12-01), Horikawa
patent: 4985629 (1991-01-01), Horikawa
patent: 5028783 (1991-07-01), Arakawa

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