Digital output binning

An imaging system includes a readout integrated circuit (ROIC) is operatively connected to receive photocurrent from a plurality of photodetectors (e.g., from a plurality of photodetectors of a photodetector array (PDA)). An event detection circuit in each ROIC pixel readout circuit generates binary output data, wherein the ROIC compresses the binary output data with a logical summary binning of N×M pixel binary outputs into a single summary output bit. The ROIC can be configured to receive image data from the photodetectors to form an image at a first frame rate, and to receive the binned binary data from the photodetectors at a second frame rate higher than the first frame rate.