Improving Fast Auto-Focus with Event Polarity
This addresses auto-focus challenges for event camera applications, representing an incremental improvement in speed and accuracy.
The paper tackles fast auto-focus in adverse conditions by proposing an event-based focusing algorithm that leverages event polarity symmetry, achieving precise focus within 0.004 seconds with less than one depth of focus.
Fast and accurate auto-focus in adverse conditions remains an arduous task. The emergence of event cameras has opened up new possibilities for addressing the challenge. This paper presents a new high-speed and accurate event-based focusing algorithm. Specifically, the symmetrical relationship between the event polarities in focusing is investigated, and the event-based focus evaluation function is proposed based on the principles of the event cameras and the imaging model in the focusing process. Comprehensive experiments on the public event-based autofocus dataset (EAD) show the robustness of the model. Furthermore, precise focus with less than one depth of focus is achieved within 0.004 seconds on our self-built high-speed focusing platform. The dataset and code will be made publicly available.