Szukana fraza: [Abstract = "The photocharge generated in the photodiode sensors is sensed nondestructively, using a buffer amplifier prior to being sampled onto the local capacitor. The charge on each capacitor is sensed in turn in the same manner prior to being dumped to the output line. The output circuitry consists of a parallel array of differential amplifiers and comparators. The amplifiers perform frame\-differencing between the current and previous frames while the comparators are used for global thresholding."]