Sample-and-hold circuit with black sun control
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United States of America Patent
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Nov 21, 2017
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app pub date -
Oct 30, 2015
filing date -
Oct 30, 2015
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Abstract
An image processing circuit comprises a first sample-and-hold circuit that samples a first data from a pixel; a second sample-and-hold circuit that samples a second data from the pixel; a voltage-to-current circuit that includes a resistor and a current source, and receives the first data and the second data to output a difference data; and a black sun spot determination circuit. The black sun spot determination circuit compares a first VSL level at a first time with a second VSL level at a second time, both from the second sample-and-hold circuit, and determines the presence of a black sun spot based on a difference between the first and second level.
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