A CMOS image sensor uses a special exposure control circuit to independently adjust the
photodiode exposure (integration) time for each pixel in a pixel array to obtain non-saturated
photodiode charges for each pixel. Exposure time adjustment involves extrapolating a
pixel's final photodiode charge using an intermediate photodiode charge measured after a
predetermined portion of an exposure frame period. If the intermediate photodiode charge
is, eg, over 50% of the photodiode's full-well capacity after half of the exposure frame period …