An Analog Network Based on Retinal Vision Processing

Abstract

This paper describes fundamental concepts of an artificial retinal chip and the integration of the outer retina circuit producing edge information and the inner retina circuit producing motion information. In order to accomplish reasonable outputs of the circuit, we introduced Pulse Density Modulation (PDM) circuit based on ganglion cell layer, the final layer of the retina. The simulation results utilized SPICE showed that output currents of both inner circuit and outer circuit were converted to the pulses whose edge and motion information were encoded. These output pulses corresponded to the output signal of retinal ganglion cell.