15 May 2018 Extended depth of field in an intrinsically wavefront-encoded biometric iris camera
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Abstract
This work describes a design process that 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 that is insensitive to defocus so that recorded images may be deconvolved without the 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.
© 2018 Society of Photo-Optical Instrumentation Engineers (SPIE)
Matthew D. Bergkoetter, Matthew D. Bergkoetter, Julie L. Bentley, Julie L. Bentley, } "Extended depth of field in an intrinsically wavefront-encoded biometric iris camera," Optical Engineering 57(5), 055103 (15 May 2018). https://doi.org/10.1117/1.OE.57.5.055103 . Submission: Received: 11 February 2018; Accepted: 25 April 2018
Received: 11 February 2018; Accepted: 25 April 2018; Published: 15 May 2018
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