An Address-Event Image Sensor Network

We discuss an imaging architecture for sensor network applications, that employs a 32 times 32 address-event representation (AER) imager. At the sensor level, pixels convert light intensity into a pulse density modulated stream of address events. Two different types of COTS wireless radio nodes are used, along with two separate approaches to wireless data transmission - one as a train of AER addresses, and the other as a histogram of the active pixels. Information transmitted in the limited-bandwidth network yields effective means for detection and partial recognition of the object even at very low bit rates, yielding a maximum experimental frame-rate of close to 6fps