1. An active pixel sensor comprising: at least one pixel comprising a photodetector that outputs an output level indicative of incoming light; a sample and hold element electrically connected to the pixel operating to store a signal output level during a readout operation; an adjusted saturated voltage source, comprising a node which provides an adjusted saturation voltage; and a comparator having a first input node operatively connected to the sample and hold element, a second input node electrically connected to the adjusted saturation voltage node, and an output node, said comparator operating to output a signal indicating whether the adjusted saturation voltage exceeds the output level from the photodetector.