Offset correction to the output of a charge coupled device
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United States of America Patent
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Nov 23, 2004
Grant Date -
N/A
app pub date -
Oct 31, 2000
filing date -
Oct 31, 2000
priority date (Note) -
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status (Latency Note)
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Abstract
The voltage outputs of a charge coupled device (CCD) are examined to determine the hot pixels. A black pixel is determined to be a hot pixel if the voltage level associated with the black pixel exceeds the voltage level of an adjacent (e.g., previous) pixel by a threshold. If the present black pixel is determined to be a hot pixel, a previous black pixel is substituted for a present black pixel in the computation of the offset. However, if the first black pixel is determined to be a hot pixel, the second black pixel is used in lieu of the first black pixel. The offset is iteratively adjusted by an amount proportionate to an error determined based on the black pixels. The adjustment may be clipped by a threshold to avoid bands in the image.
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