Shading elimination method

Details Shading elimination method Shading elimination method

1988-06-10

1989-12-05

Howell, Janice A.

Radiant energy

Automatic/serial detection of similar sources

358163, G01N 2304, H04M 140

Patent

active

048854670

ABSTRACT:
Shading is eliminated in an image read-out apparatus for scanning a light beam on a recording medium carrying an image recorded thereon, obtaining light which carries the image by the scanning, and detecting the light by use of a photomultiplier to obtain read-out signals carrying the image. A shading elimination method comprises the steps of detecting the shading characteristics in the direction of main scanning of the light beam by changing the level of high voltage applied to the photomultiplier to a plurality of levels prior to the detection of the light, and storing the shading characteristics to correspond to the levels of the high voltage in a memory. The level of the high voltage is detected at the time of the detection of the light, and the shading characteristics that correspond to the detected level of the high voltage are read from the memory. The read-out signals are corrected in accordance with the shading characteristics read from the memory so that changes in the output of the photomultiplier caused by the shading are eliminated.

REFERENCES:
patent: 4258264 (1981-03-01), Kotera et al.
patent: 4346295 (1982-08-01), Tanaka et al.
patent: 4520395 (1985-05-01), Abe
patent: 4523229 (1985-06-01), Kanmoto
patent: 4524388 (1985-06-01), Abe et al.
patent: 4633314 (1986-12-01), Kurata et al.
patent: 4734783 (1988-03-01), Horikawa
patent: 4818876 (1989-04-01), Agano et al.

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