Abstract
Wearable Video See-Through (VST) devices for Augmented Reality (AR) and for obtaining a Magnified View are taking hold in the medical and surgical fields. However, these devices are not yet usable in daily clinical practice, due to focusing problems and a limited depth of field. This study investigates the use of liquid-lens optics to create an autofocus system for wearable VST visors. The autofocus system is based on a Time of Flight (TOF) distance sensor and an active autofocus control system. The integrated autofocus system in the wearable VST viewers showed good potential in terms of providing rapid focus at various distances and a magnified view.
Highlights
The use of magnifying glasses in surgical practice has been well established [1]
The working distance depends on the focal length of the device employed, and the optical properties of the device define the depth of field (DOF), i.e., the distance between the nearest and farthest plane in focus in an image
The purpose of this work is not directly related to the idea is that the autofocus system developed could be integrated within a magnification, the the idea idea is is that that the the autofocus autofocus system system developed developed could could be be integrated integrated within within magnification, that provides the surgeon with a zoom, and we evaluated which magnification can a that provides the surgeon with a zoom, and we evaluated which a Video See-Through (VST) Head Mounted Displays (HMDs) that provides the surgeon with a zoom, and we evaluated which be obtained with our system
Summary
The use of magnifying glasses in surgical practice has been well established [1]. The magnification depends on the surgical specialties, the intervention and the device deployed to change the magnified view. The working distance depends on the focal length of the device employed, and the optical properties of the device define the depth of field (DOF), i.e., the distance between the nearest and farthest plane in focus in an image (e.g., from 30 cm to 45 cm). This intrinsically depends on the choice of optics and camera sensor and defines the distance limits at which a camera is able to keep objects in focus [3,4]. As focusing is dependent on different factors, a focusing time of
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