A Single-Slope PWM Imaging Method for Multi-Mode Dynamic Vision Sensor

Abstract

To break through the limitation of dynamic vision sensor (DVS) in object recognition and classification, a pulse width modulation (PWM) imaging method in a multi-mode DVS which integrates temporal contrast detection with brightness measurement is proposed. The improved logarithmic photoreceptor with pulse coding strategy ensures a theoretical intra-scene dynamic range of 130 dB. The 128×128 vision sensor has been implemented in a 0.18 µm 2P4M CMOS technology. The pixel pitch is 16.5 µm and the chip occupies a silicon area of 3.9×3.5 mm2. The log sensitivity of our pixel has been verified to be164 mV/Dec in chip testing.