Image signal processing apparatus for setting a noise component attenuation characteristic
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United States of America Patent
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Nov 30, 2010
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N/A
app pub date -
Jan 21, 2005
filing date -
Jan 23, 2004
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Abstract
An image signal is input to two LPFs having different transmission characteristics. A selector chooses one of outputs of the respective LPFs and delivers the chosen output to a gamma correction circuit. The switching of the selector is controlled by a filter control circuit. In the filter control circuit, a comparator compares an exposure time E of a current frame with a threshold value R. The selector is controlled so as to select an output of one of the LPFs that has a lower cutoff frequency and a greater noise component elimination effect than the other LPF does if the exposure time E is longer than or equal to the threshold value R.
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