Image scanner with automatic signal compensation
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United States of America Patent
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Feb 18, 2003
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N/A
app pub date -
Apr 16, 1996
filing date -
Apr 16, 1996
priority date (Note) -
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Abstract
The present invention relates to an image scanner with automatic signal compensation function for compensating the instability of a light source of the image scanner. The image scanner comprises a test region, a light source for illuminating the document and the test region, optical means for conveying the light reflected from the document and the test region, a line image sensor for receiving the light from the optical means and generating an image signal corresponding to the light reflected from the document and a brightness signal corresponding to the light reflected from the test region, and a signal compensation circuit for amplifying the image signal according to the brightness signal to compensate the instability in the brightness of the light source.
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