An ultra-short distance ring-shaped lighting system with high illuminance, high uniformity, and high efficiency for palm-print recognition

Weibiao Zhou; Kai Xia; Runzeng Guo; Shiyou Sun; Bincheng Mo; Changze Xiao; Shaoming Wang; Jiayu Huang; Ruibin Huang; Zhibin Li; Fanglu Lyu

doi:10.1117/12.2688034

6 November 2023 An ultra-short distance ring-shaped lighting system with high illuminance, high uniformity, and high efficiency for palm-print recognition

Weibiao Zhou, Kai Xia, Runzeng Guo, Shiyou Sun, Bincheng Mo, Changze Xiao, Shaoming Wang, Jiayu Huang, Ruibin Huang, Zhibin Li, Fanglu Lyu

Author Affiliations +

Proceedings Volume 12921, Third International Computing Imaging Conference (CITA 2023); 129210Q (2023) https://doi.org/10.1117/12.2688034
Event: Third International Computing Imaging Conference (CITA 2023), 2023, Sydney, Australia

Abstract

There have been numerous optical technologies for palm-print identification in recent years. The uniformity of illumination and field of view limitations of these systems make it challenging to take high-quality photographs of palm prints at ultra-short distance range. We proposed a visible-lighting system with high illuminance, homogeneity, and lighting efficiency specifically for palm-print recognition applications as a solution to these problems. We enumerated the theoretical underpinnings and walk through the process of designing the ultra-short-range circular lighting system. The next step was to select a combination of surface textures and materials with an appropriate ratio of the diffusion agent to balance the illuminations at both the near-end and the far-end. A trade-off between illumination uniformity and system efficiency is revealed by the analysis of experimental data: near-end illumination favors high uniformity and so requires high scattering, whereas far-end illumination prefers high efficiency and thus requires low scattering. We achieved the trade-offs design goal by ensuring the illumination at the far end with an acceptable diameter and enhancing the illumination at the center of the near end by developing a distinctive inwardly curved surface. Our ultra-short-distance (30 mm) lighting solution obtained over 80% illumination uniformity in the recognition area and an 80% increase in the far-end efficiency of the illumination system. We believe the theoretical basis and data compiled in this paper are beneficial to the development of the palm recognition industry and also applicable to other related near-field image acquisition systems.

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Weibiao Zhou, Kai Xia, Runzeng Guo, Shiyou Sun, Bincheng Mo, Changze Xiao, Shaoming Wang, Jiayu Huang, Ruibin Huang, Zhibin Li, and Fanglu Lyu "An ultra-short distance ring-shaped lighting system with high illuminance, high uniformity, and high efficiency for palm-print recognition", Proc. SPIE 12921, Third International Computing Imaging Conference (CITA 2023), 129210Q (6 November 2023); https://doi.org/10.1117/12.2688034

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KEYWORDS

Light sources and illumination

Diffusers

Light emitting diodes

LED lighting

Diffusion

Design and modelling

Image quality

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