Events Meet Phase-Shifting Digital Holography: Practical Acquisition, Theory, and Algorithms

TL;DR

This paper presents a new phase-shifting digital holography technique using a hybrid event-based sensor that improves acquisition efficiency while maintaining high reconstruction quality.

Contribution

It introduces a novel PSDH method leveraging hybrid EVS to perform phase shifts during a single exposure, supported by analytical and optimization-based reconstruction algorithms.

Findings

Achieves high-quality wavefront reconstruction comparable to conventional methods

Enhances acquisition efficiency with phase shift during a single exposure

Utilizes hybrid EVS to record hologram and event data simultaneously

Abstract

We introduce a novel phase-shifting digital holography (PSDH) method leveraging a hybrid event-based vision sensor (EVS). The key idea of our method is the phase shift during a single exposure. The hybrid EVS records a hologram blurred by the phase shift, together with the events corresponding to blur variations. We present analytical and optimization-based methods that theoretically support the reconstruction of full-complex wavefronts from the blurred hologram and events. The experimental results demonstrate that our method achieves a reconstruction quality comparable to that of a conventional PSDH method while enhancing the acquisition efficiency.