A 64 × 64 pixels 30µW vision sensor with binary data compression

In this work, we describe preliminary results re lated to an ultra-low power vision sensor, embedding contrast extraction and output data compression. The sensor performs less than 30 μW at 3.3 V and 30 frame/s, combining data compression together with event detection capabilities and efficient sensor interface. This makes the presented sensor to be suitable for energy-autonomous applications, ranging from surveillance to people counting and monitoring. A prototype of vision system has been realized interfacing the chip with a low power CPLD, which manages the different sensor operating modes. The module drives a total average current of less than 500 μ A at 30 fps. Powered with a small 900 mAh lithium battery, the vision system will be able to work continuously for about 3 months.