Image reader
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United States of America Patent
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Nov 7, 2000
Grant Date -
N/A
app pub date -
Apr 21, 1998
filing date -
Apr 24, 1997
priority date (Note) -
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Abstract
An image reader having a shading correction function includes a scanner for scanning an original, a converter for converting the received light from the original into electric signals and outputting the electric signal as data of an read image, and a corrector for carrying out a shading correction operation on the data of the read image on the basis of a shading correction value and outputting corrected image data. The corrector computes shading correction values for the whole reading face of the original platen from the shading correction value at an arbitrary position on the reading face and carries out the shading correction operation on the data of the read image on the basis of the computed shading correction values.
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