DC OFFSET AND GAIN CORRECTION FOR CMOS IMAGE SENSOR

摘要

An imaging system and method for correcting for differences between correlated double sampling (CDS) circuits of a row of CDS circuits of an imager of the imaging system. According to one embodiment, a plurality of gain correction coefficients having an initial value and a plurality of dc offset correction coefficients having an initial value are stored. A reference dc offset value and a reference gain value are determined, and a dc offset value and a gain value for each CDS circuit is determined. The dc offset value and gain value for each CDS circuit is compared to the reference dc offset value and reference gain value, respectively, and the plurality of gain correction coefficients and the plurality of dc offset correction coefficients is updated in accordance with the comparisons.