Image reading device, image reading method, and image forming apparatus for correcting digital image signal using modulated reference signal
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United States of America Patent
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May 28, 2013
Grant Date -
Sep 16, 2010
app pub date -
Mar 8, 2010
filing date -
Mar 10, 2009
priority date (Note) -
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Abstract
A reference-signal generating unit generates a reference signal for generating a driving signal to drive other units of the image reading device. A frequency modulating unit modulates frequency of the reference signal, thereby generating a frequency-modulated reference signal. A driving-signal generating unit generates the driving signal from the frequency-modulated reference signal. A photoelectric converting unit converts an incident light into an analog image signal using the driving signal. An AD converting unit converts the analog image signal into a digital image signal. A correcting unit corrects the digital image signal by generating a correction signal for eliminating a noise superimposed on the digital image signal using the frequency-modulated reference signal and adding the correction signal to the digital image signal.
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