Motion detection silicon retina based on event correlations

This article reports on a functional two-dimensional analog silicon retina performing motion detection along three directions at 120 degrees of each other and 2 speed channels per direction. The output of each channel is binary, however integration of this information over time yields an analog value. Motion detection is performed by correlation of events, which are the disappearance of edges. A retina made of 23 by 23 pixels with an hexagonal layout of pixels was integrated in a 2 /spl mu/m CMOS technology and showed to perform well. Pixel size is 223 /spl mu/m/spl times/215 /spl mu/m and consumption is around 20 /spl mu/W per pixel.