Characterization of dim light response in DVS pixel: Discontinuity of event triggering time

TL;DR

This paper investigates the behavior of Dynamic Vision Sensors in dim light, revealing a discontinuity in event triggering time that depends on light intensity change speed, which impacts their application in low-light conditions.

Contribution

It provides the first detailed analysis of event triggering discontinuity in DVS under dim light, linking it to light intensity change speed and validating findings with real data.

Findings

Discontinuity in event triggering time becomes prominent in dim light.

Discontinuity depends exclusively on the changing speed of light intensity.

Experimental results confirm the non-first-order behavior of DVS in low-light conditions.

Abstract

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.