Mitigation of Parasitic Light Sensitivity in Global Shutter CMOS Image Sensors Through Use of Correction Frame

A postprocessing method for mitigating parasitic light sensitivity in global shutter CMOS image sensor (GS-CIS) has been developed by means of an additional frame for correction. The method uses the capability of GS-CISs to integrate the correction frame during the readout phase, allowing for a concurrent measurement of the parasitic light-induced signal. The method relies on development and validation, through experimental data, of the pixel output model in global shutter mode. The pixel output model studies the signal induced by parasitic light collection. Noise associated with correction is modeled and analyses are performed, showing some impact on the corrected frame.