An asynchronous time-based image sensor

In this paper we propose a fully asynchronous, time-based image sensor, which is characterized by high temporal resolution, low data rate (near complete temporal redundancy suppression), high dynamic range, and low power consumption. Autonomous pixels asynchronously communicate the detection of relative changes in light intensity, and the time from change detection to the threshold crossing of a photocurrent integrator, so encoding the instantaneous pixel illumination shortly after the time of a detected change. The chip is being implemented in a standard 0.18 mu m CMOS process and measures less than 10x8mm(2) at 304x240 pixel resolution.