Abstract: A pixel readout circuit and a technique for imaging are disclosed. The circuit includes: an array of pixel integration circuits, each adapted for receiving an electric signal indicative of photocurrent of light sensitive pixel of a pixel matrix, integrate the electric signal over a frame period, and output the integrated signal at an imaging frame rate being one over the period; and an array of pixel derivation circuits, each includes a signal preprocessing channel for receiving a total electric signal indicative of at least a component of the photocurrent(s) of a cluster of respective light sensitive pixel(s); and a comparison unit adapted to analyze the total electric signal to determine digital data indicative of a change in the total electric signal relative to one or more thresholds; and a digital output utility adapted to readout of the digital data at a second rate different than the frame rate.