Dark current gradient estimation using optically black pixels
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United States of America Patent
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Apr 18, 2017
Grant Date -
Jul 28, 2016
app pub date -
Jan 27, 2015
filing date -
Jan 27, 2015
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Abstract
A method for removing background signal values from readout signal values generated by image pixels in a pixel array may include generating background signal values using optically black pixels formed around a border of the pixel array. The background signal values may be separated into blocks. Block average values may be calculated based on the background signal values included in each of the blocks. Corner regions of the pixel array may be free of image pixels and optically black pixels. Corner background signal values may be extrapolated based on the block average values. Image pixel background signal values may be interpolated based on the block average values and the corner background signal values. The image pixel background signal values may be subtracted from the readout values.
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