Active milliseconds zooming and tracking optics based on liquid lenses and a high-speed gaze controller

Jiaqi Li; Lin Li; Lihui Wang; Lei Li; Shaoyong Li

doi:10.1117/12.2686749

28 November 2023 Active milliseconds zooming and tracking optics based on liquid lenses and a high-speed gaze controller

Jiaqi Li, Lin Li, Lihui Wang, Lei Li, Shaoyong Li

Author Affiliations +

Proceedings Volume 12765, Optical Design and Testing XIII; 1276505 (2023) https://doi.org/10.1117/12.2686749
Event: SPIE/COS Photonics Asia, 2023, Beijing, China

Abstract

The traditional method of monitoring cameras is employed in robot vision, surveillance cameras, and so on. However, it cannot track as fast as expected due to the large inertia of the camera and mechanical pan-tilt. It also decreases the optical resolution because of the digital zoom on the interest area. Therefore, we proposed high-speed zooming and tracking optics that consists of an optical zooming unit and an active tracking unit. The two units are designed with coaxial optical paths by a beam splitter. The zooming unit is built with three liquid lenses, one glass lens, and a high-speed camera. It can continuously change the magnification from 1x to 2x. By controlling the optical powers of three liquid lenses, the focal length of the zooming unit can be changed from 40 to 80 mm within milliseconds. The tracking unit composed of a high-speed mirror-based gaze controller, a high-speed camera, and pupil shift optics, can track the object and keep it in the center of both views. In addition, the zooming unit provides a compensation algorithm for the zooming unit to achieve adaptive zoom accurately. The experiment shows that the zooming unit performs adaptive optical zoom, and the tracking unit recognizes the object by adaptive tracking algorithm within 6 milliseconds.

(2023) Published by SPIE. Downloading of the abstract is permitted for personal use only.

Citation Download Citation

Jiaqi Li, Lin Li, Lihui Wang, Lei Li, and Shaoyong Li "Active milliseconds zooming and tracking optics based on liquid lenses and a high-speed gaze controller", Proc. SPIE 12765, Optical Design and Testing XIII, 1276505 (28 November 2023); https://doi.org/10.1117/12.2686749

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KEYWORDS

Eye tracking

Active optics

Liquid lenses

Optical tracking

Adaptive optics

Cameras

Zoom lenses

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