CMOS Continuous-Time Selective Change Driven Vision Sensor

Selective Change Driven (SCD) Vision consists of delivering, on demand, the pixel that has undergone the largest change since the last time it was read out. This implies a continuous pixel flow ordered depending on their change, which is usually related to the importance of each pixel in the implemented algorithm. This strategy reduces by several orders of magnitude the information sent by the vision sensor without losing accuracy, since only relevant information is sent to the processing hardware. The SCD sensor presented here is based on a continuous-time sensing cell and delivers its illumination level and its address with a minimum delay of 2 μs. At this speed, the sensor is able to signal events, along with its grey value, with a time resolution of 2 μs, allowing the real-time tracking of very fast moving objects.