2017
DOI: 10.1364/oe.25.031696
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Extending the depth of field with chromatic aberration for dual-wavelength iris imaging

Abstract: Abstract:We propose a method of extending the depth of field to twice that achievable by conventional lenses for the purpose of a low cost iris recognition front-facing camera in mobile phones. By introducing intrinsic primary chromatic aberration in the lens, the depth of field is doubled by means of dual wavelength illumination. The lens parameters (radius of curvature, optical power) can be found analytically by using paraxial raytracing. The effective range of distances covered increases with dispersion of… Show more

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Cited by 4 publications
(1 citation statement)
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“…A single calibration with the laser in CW mode was sufficient to determine the TM needed to generate an chromatic extended depth of field for femtosecond pulses. Indeed, dispersion in the step-index MMF axially distributed the broader spectral content of pulses compared to the CW light around the calibration plane, effectively generating an axially elongated chromatic focus [23,24]. The use of a CW laser for the calibration had the added benefit of allowing a design employing removable distal optics, an im- portant advantage for biological imaging applications.…”
mentioning
confidence: 99%
“…A single calibration with the laser in CW mode was sufficient to determine the TM needed to generate an chromatic extended depth of field for femtosecond pulses. Indeed, dispersion in the step-index MMF axially distributed the broader spectral content of pulses compared to the CW light around the calibration plane, effectively generating an axially elongated chromatic focus [23,24]. The use of a CW laser for the calibration had the added benefit of allowing a design employing removable distal optics, an im- portant advantage for biological imaging applications.…”
mentioning
confidence: 99%