Shading elimination method for an image read-out apparatus

Radiant energy – Automatic/serial detection of similar sources

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2504841, G01N 2304

Patent

active

050287834

ABSTRACT:
A shading elimination method comprising these steps: before an image is detected as an image signal from a recording medium which has the image recorded thereon, the characteristics of shading caused by nonuniformity in how a photoelectric read-out device detects light emitted from the recording medium when it is exposed to a light beam, or the like are detected. The characteristics of the shading are detected from operations wherein a linear light source, composed of point light sources arrayed linearly with the intensities of light measured in advance, is positioned facing the photoelectric read-out device; the point light sources are sequentially turned on; the intensities of the light produced by the point light sources are detected by the photoelectric read-out device; and the intensities of the light thus detected are compared with the intensities of light measured in advance. Fluctuations in the image signal, caused by shading, are eliminated based on the characteristics of the shading.

REFERENCES:
patent: 4734783 (1988-03-01), Horikawa
patent: 4816678 (1989-03-01), Takasaki
patent: 4816679 (1989-03-01), Sunagawa et al.

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