Imaging systems with flicker mitigation and high dynamic range

A method for capturing image data for an image pixel during an image frame, wherein the image pixel comprises a photodiode, a charge storage region, and a charge readout circuit coupled between the charge storage region and an output line, the method comprising:

• with the photodiode, accumulating an amount of charge for a first time period, wherein the amount of charge is stored in the charge storage region;
• with the photodiode, accumulating an additional amount of charge for a second time period that is subsequent to the first time period;
• and
• at the end of second time period, using the charge readout circuit to supply a first signal to the output line corresponding to the amount of charge on the charge storage region.

A method for capturing image data for an image pixel during an image frame, wherein the image pixel comprises a photodiode, a charge storage region, a transfer transistor coupled between the charge storage region and the photodiode, a reset transistor, and a charge readout circuit coupled between the charge storage region and an output line, the method comprising:

• during a first time period, accumulating charge in the photodiode during a first exposure period;
• transferring the charge accumulated during the first exposure period to the charge storage region using the transfer transistor;
• supplying a first signal to the output line corresponding to the charge accumulated during the first exposure period;
• after supplying the first signal to the output line corresponding to the charge accumulated during the first exposure period, resetting the charge storage region with the reset transistor;
• and
• after resetting the charge storage region with the reset transistor, supplying a second signal to the output line corresponding to a reset level of charge.