BLACK LEVEL CORRECTION FOR IMAGING PIXELS

摘要

A technique for obtaining a corrected pixel value is disclosed. The technique includes measuring a first dark current of a dark calibration pixel of a pixel array and measuring a second dark current of an imaging pixel of the pixel array. A dark current ratio is calculated based on the first dark current and the second dark current. An image charge is acquired with the imaging pixel where the image charge is accumulated over a first time period. A charge is acquired with the dark calibration pixel where the charge is accumulated over a second time period. The second time period is approximately equal to the first time period divided by the dark current ratio. A corrected imaging pixel value is calculated using a first readout from the imaging pixel and a second readout from the dark calibration pixel.