An AER Contrast Retina with On-Chip Calibration

Description

We present a contrast retina microchip that provides its output as an AER (Address Event Representation) stream. Contrast is computed as the ratio between pixel photocurrent and a local average between neighboring pixels obtained with a diffusive network. This current based computation produces a large mismatch between neighboring pixels, because the currents can be as low as a few pico amperes. Consequently, a compact calibration circuitry has been included to calibrate each pixel. The paper describes the design of the pixel with its contrast computation and calibration sections. Experimental results are provided for a prototype fabricated in a standard 0.35μm CMOS process.

Abstract

Comisión Interministerial de Ciencia y Tecnología TIC2003-08164-C03-01

Abstract

European Union IST-2001-34124

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