Event-based Asynchronous HDR Imaging by Temporal Incident Light Modulation
This addresses the challenge of HDR imaging for cameras, which struggle with spatially variant illumination, but it appears incremental as it builds on existing DVS technology.
The paper tackles the problem of high dynamic range (HDR) imaging by proposing AsynHDR, a system that uses Dynamic Vision Sensors (DVS) with LCD panels to modulate incident light and decode HDR images from event streams, achieving feasibility in experiments under standard and challenging scenes.
Dynamic Range (DR) is a pivotal characteristic of imaging systems. Current frame-based cameras struggle to achieve high dynamic range imaging due to the conflict between globally uniform exposure and spatially variant scene illumination. In this paper, we propose AsynHDR, a Pixel-Asynchronous HDR imaging system, based on key insights into the challenges in HDR imaging and the unique event-generating mechanism of Dynamic Vision Sensors (DVS). Our proposed AsynHDR system integrates the DVS with a set of LCD panels. The LCD panels modulate the irradiance incident upon the DVS by altering their transparency, thereby triggering the pixel-independent event streams. The HDR image is subsequently decoded from the event streams through our temporal-weighted algorithm. Experiments under standard test platform and several challenging scenes have verified the feasibility of the system in HDR imaging task.