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17 December 2014 Extended depth of field in an intrinsically wavefront-encoded biometric iris camera
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Proceedings Volume 9293, International Optical Design Conference 2014; 92931W (2014) https://doi.org/10.1117/12.2073312
Event: International Optical Design Conference, 2014, Kohala Coast, Hawaii, United States
Abstract
This work describes a design process which greatly increases the depth of field of a simple three-element lens system intended for biometric iris recognition. The system is optimized to produce a point spread function which is insensitive to defocus, so that recorded images may be deconvolved without knowledge of the exact object distance. This is essentially a variation on the technique of wavefront encoding, however the desired encoding effect is achieved by aberrations intrinsic to the lens system itself, without the need for a pupil phase mask.
© (2014) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Matthew D. Bergkoetter and Julie L. Bentley "Extended depth of field in an intrinsically wavefront-encoded biometric iris camera", Proc. SPIE 9293, International Optical Design Conference 2014, 92931W (17 December 2014); doi: 10.1117/12.2073312; https://doi.org/10.1117/12.2073312
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