On the use of a liquid lens for improving iris images quality in a hyperspectral system

Ettore Masetti; Luigi Rovati

doi:10.1117/12.2650233

14 March 2023 On the use of a liquid lens for improving iris images quality in a hyperspectral system

Ettore Masetti, Luigi Rovati

Author Affiliations +

Proceedings Volume 12360, Ophthalmic Technologies XXXIII; 123600K (2023) https://doi.org/10.1117/12.2650233
Event: SPIE BiOS, 2023, San Francisco, California, United States

Conference Poster

Abstract

In this paper, we describe how using a liquid lens can improve the quality of iris images acquired by a hyperspectral system. This improvement in the image quality is especially noticeable for systems that scan the iris over a wide range of wavelengths, e.g. visible and near-infrared spectrum. We have tested this approach on the previously developed system able to acquire iris images in the spectral range 480 - 900 nm. The key novelty presented in this paper is represented by the possibility of adaptively adjusting the focus of the imaging system, allowing for chromatic aberration compensation and ensuring a constant image sharpness among all wavelengths. A fast-tunable liquid lens has been placed in front of the chromatically corrected camera objective to adaptively change the overall focus of the imaging system. The findings imply that the device can rapidly perform hyperspectral measurements of the iris over a broad wavelength range ensuring optimal focus for all images.

Citation Download Citation

Ettore Masetti and Luigi Rovati "On the use of a liquid lens for improving iris images quality in a hyperspectral system", Proc. SPIE 12360, Ophthalmic Technologies XXXIII, 123600K (14 March 2023); https://doi.org/10.1117/12.2650233

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