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Erschienen in:
2018 | OriginalPaper | Buchkapitel
Design of a Long Distance Zoom Lens for Iris Recognition
verfasst von : Xiaoyu Lv, Wenzhe Liao, Kaijun Yi, Junxiong Gao
Erschienen in: Biometric Recognition
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Abstract
This paper presents a zoom lens for iris recognition to solve the problem of narrow working range with fixed size of iris image. The lens with a wide and long working range and high resolution images with the same iris size in different work distance was designed. An 2.6× long distance zoom lens was designed which includes 35~91 mm focal length, work distance from 750 mm to 1910 mm, less than 0.5% distortion, 3.5 working F number, 9.5 mm image diameter, 780 nm~890 nm wavelength of operating spectrum. At 166 lp/mm, the lens can capture iris image over all field of view with MTF > 0.3.