Patent ID: 7990451

Claim:
An image sensor comprising: an array comprising a plurality of photosensitive pixels, each of said pixels comprising a photosensor configured for outputting a signal indicative of an intensity of incident light, a single-bit in-pixel memory configured for storing a respective flag indicative of a pixel reset state, and a reset logic element configured for resetting said photosensor in accordance with a reset state stored in said in-pixel memory upon receipt of an array reset signal; an array reset input associated with said array, configured for inputting an array reset signal and for providing said array reset signal in parallel to each of said pixels in said array; and at least one comparator unit associated with said array, configured for comparing a photosensor readout signal to a threshold; and a logic unit associated with said comparator, said array reset input and said array, configured for setting each of said in-pixel memories to a respective reset state of said photosensor in accordance with a result of said comparison, conditional upon the reset of said pixel in the preceding time interval, and for loading said reset state into a flag of a respective pixel.