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Proceedings Paper

Image restoration for an encoded pupil plane
Author(s): Samir Mezouari
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Paper Abstract

To extend the depth-of-focus of incoherent imaging systems an aspherical pupil plane element is designed to encode the incident wavefront in such a way that the image recorded by the detector can be accurately restored over a large range of defocus. This approach alleviates thermal and chromatic defocus whilst maintaining diffraction-limited resolution for incoherent imaging systems [1] by using simple and low-cost one- or two-element lenses. However this is bought at the price of a reduction in signal-to-noise ratio of the displayed image as is associated with most inverse filtering problems. This sets a serious limit to future applications, particularly in thermal imaging where the optical systems involve fast optics with a very small depth of field for which signal-to-noise ratio of restored images can be reduced significantly.

Paper Details

Date Published: 29 August 2017
PDF: 3 pages
Proc. SPIE 10313, Opto-Canada: SPIE Regional Meeting on Optoelectronics, Photonics, and Imaging, 103133I (29 August 2017); doi: 10.1117/12.2283922
Show Author Affiliations
Samir Mezouari, Heriot-Watt Univ. (United Kingdom)

Published in SPIE Proceedings Vol. 10313:
Opto-Canada: SPIE Regional Meeting on Optoelectronics, Photonics, and Imaging
John C. Armitage, Editor(s)

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