Imaging with Fresnel zone pupil masks: extended depth of field
Open Access
- 1 December 1984
- journal article
- Published by Optica Publishing Group in Applied Optics
- Vol. 23 (23) , 4299-4302
- https://doi.org/10.1364/ao.23.004299
Abstract
Fresnel zone plates are used as pupil apertures to extend the depth of field of an incoherent imaging system. The defocused optical transfer function is evaluated approximately, and the results are confirmed by experiments and by subjective evaluations of the images of a test chart. With a pupil having four zones, for example, the resolution limit at four depths of field out of focus is improved by a factor of 10.Keywords
This publication has 3 references indexed in Scilit:
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- Improvement in the OTF of a Defocused Optical System Through the Use of Shaded AperturesApplied Optics, 1971
- Use of Annular Apertures to Increase Focal DepthJournal of the Optical Society of America, 1960