DARK CURRENT CALIBRATION METHOD AND ASSOCIATED PIXEL CIRCUITRY

Image sensors capable of dark current calibration and associated circuits are disclosed herein. The method for calibrating dark current includes acquiring at least one dark current frame of a first plurality of pixels of a pixel array of the image sensor. The dark current frame contains readings of individual dark currents for the corresponding pixels obtained during an exposure period when a transistor is turned on disabling the photodiode. The method also includes acquiring at least one normal frame of a second plurality of pixels of the pixel array of the image sensor. The normal frame contains readings of individual signals for the corresponding pixels obtained during the exposure period when the transistor is turned OFF. The method includes subtracting the at least one dark current frame from the at least one normal frame.