The output of each pixel is the power in the delay line signal, computed within each pixel. This power computation provides the essential nonlinearity for velocity-selectivity. As a result, the detectors are sensitive to motion over a wide range of spatial frequencies. A velocity-selective detector requires only a single delay element and nonlinearity for each tuned velocity, and is sensitive to both light and dark contrasts. The use of adaptive photoreceptors and compact circuits makes for a well-conditioned input signal and small circuit offsets, resulting in robust operation.
All circuits work in subthreshold, resulting in low power consumption.
Some of the circuits used in this pixel are described in papers. The receptor circuits are discussed here . The antibump nonlinearity circuit is discussed here . Another motion chip based on the Barlow-Levick scheme is discussed in the paper available here . Tobi Delbruck Local HotBot search.