Quality of optically black reference pixels in CMOS iSoCs

A method, comprising:

• indicating pixels to be read out during a readout time interval based on implementation of a first reset function that operates optically black rows used for fixed pattern noise correction;
• indicating pixels to be reset during the readout time interval based on implementation of a second reset function;
• determining a change to a vertical window or an integration time during the readout time interval;
• controlling a third reset function based on the change, wherein the third reset function does not have a constant input pulse;
• and
• retaining the integration time of the optically black reference pixels of column fixed pattern noise rows at a minimal value comprising retaining the integration time of column fixed pattern noise rows independent of another integration time of other rows based on implementation of a fourth reset function, wherein the fourth reset function is implemented before the first reset function is implemented, wherein the optically black reference pixels are used to measure the column fixed pattern noise.

A system, comprising:

• a read component configured to indicate pixels to be read out during a readout time interval and control a first reset function that operates optically black rows used for fixed pattern noise correction;
• a first reset component configured to indicate pixels to be reset during the readout time interval and control a second reset function;
• a second reset component configured to control a third reset function based on changes to a vertical window or an integration time during the readout time interval, wherein the third reset function does not have a constant input pulse;
• and
• a control component configured to maintain the integration time of the optically black reference pixels of column fixed pattern noise rows at a first value, and another integration time of other rows at a second value, wherein the first value and the second value are different values, the control component is further configured to control a fourth reset function, and wherein the optically black reference pixels are used to measure the column fixed pattern noise.