A CMOS Frame Difference Event Sensor with Dynamic Range Extension

The growth of Internet of Things pushes the demand for low power imagers that are used for machine vision applications. Dynamic vision systems (DVS) are event cameras that are well suited for these applications as they offer high temporal resolution, high dynamic range (DR) and low power consumption. Another way to reduce redundant data and save power, storage, and computation is by frame differencing. Frame difference is broadly used for motion detection and feature extraction. Like DVS sensors, FD sensors outperform conventional cameras in power consumption and speed. When compared to DVS sensors, the frame difference cameras are outclassed in terms of DR and speed. We aim to narrow the gap between FD and DVS sensors by increasing the dynamic range of FD sensors by implementing a lateral overflow capacitor.

Palabras clave: Event-Based sensors, high dynamic range, CMOS image sensor, EMVA