Method for eliminating nonuniformity in sensitivity in image rea

Details Method for eliminating nonuniformity in sensitivity in image rea Method for eliminating nonuniformity in sensitivity in image rea

1990-11-14

1992-02-04

Howell, Janice A.

Radiant energy

Automatic/serial detection of similar sources

2504841, G01N 2304

Patent

active

050862286

ABSTRACT:
Nonuniformity in sensitivity is eliminated in an image read-out apparatus wherein a light beam is reflected and deflected by a rotating polygon mirror such that it scans a recording medium, on which an image has been recorded, in a main scanning direction, the recording medium is simultaneously moved with respect to the light beam in a sub-scanning direction approximately normal to the main scanning direction, and light radiated out of the recording medium during the scanning is detected and converted into an image signal. Information about the characteristics of the shading along the main scanning direction is stored in a storage device. In the course of obtaining the image signal, correction values each of which is used to correct the characteristics of the shading with respect to each reflecting surface of the rotating polygon mirror, are found from the image signal. The image signal is then corrected in accordance with the characteristics of the shading and the correction values.

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