Characterization of dim light response in DVS pixel: Discontinuity of event triggering time
This addresses a problem for DVS users by revealing non-first-order behaviors that restrict applications in dim light conditions, though it appears incremental as it characterizes an existing issue without proposing a new solution.
The paper tackled the unclear behavior of Dynamic Vision Sensors (DVS) in dim light by analyzing the circuit and identifying a discontinuity in event triggering time, which depends on light intensity changes and was validated with real event data.
Dynamic Vision Sensors (DVS) have recently generated great interest because of the advantages of wide dynamic range and low latency compared with conventional frame-based cameras. However, the complicated behaviors in dim light conditions are still not clear, restricting the applications of DVS. In this paper, we analyze the typical DVS circuit, and find that there exists discontinuity of event triggering time. In dim light conditions, the discontinuity becomes prominent. We point out that the discontinuity depends exclusively on the changing speed of light intensity. Experimental results on real event data validate the analysis and the existence of discontinuity that reveals the non-first-order behaviors of DVS in dim light conditions.