Repeated nondestructive photodetector readout assessments

An image sensor comprising:

• a photodetector configured to accumulate one or more minority carrier photo charges responsive to one or more incident photons during an integration period;
• a readout structure electronically coupled to the photodetector and configured to repeatedly and nondestructively assess an amount of minority carrier photo charges accumulated at the photodetector for the integration period;
• and
• a column readout structure electronically coupled to the readout structure and including one or more capacitors, wherein each time the amount of minority carrier photo charges is nondestructively assessed by the readout structure a commensurate charge is accumulated on the one or more capacitors faster than noise is accumulated on the one or more capacitors.

An image sensor comprising:

• a photodetector configured to accumulate one or more minority carrier photo charges responsive to one or more incident photons during an integration period;
• and
• a readout structure electronically coupled to the photodetector, the readout structure including:
• a first gate,
• a second gate,
• a first source follower electronically coupled to the first gate, and
• a second source follower electronically coupled to the second gate,
• wherein the readout structure alternates the one or more photo charges between the first gate and the second gate for each of a plurality of nondestructive minority carrier photo charge assessments during the integration period.