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Proceedings Paper

Visible band lens-free imaging using coded aperture techniques
Author(s): Kevin D. Ridley; Geoffrey D. de Villiers; Douglas A. Payne; Rebecca A. Wilson; Christopher W. Slinger
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Paper Abstract

Traditionally, coded aperture techniques have been applied to short-wavelength imaging: X-rays and γ-rays. For these wavelengths, it is valid to neglect diffraction and describe the operation of the imager in purely geometric-optics terms. We have investigated coded aperture imaging in the visible band. The much longer wavelengths in this region of the spectrum mean that diffraction effects cannot be neglected. We describe the effects of diffraction and the implications for image resolution. We present experimental results from a lens-free coded-aperture imager operating in the visible band and describe the techniques used to obtain good quality images of complex greyscale scenes.

Paper Details

Date Published: 24 August 2009
PDF: 10 pages
Proc. SPIE 7468, Adaptive Coded Aperture Imaging, Non-Imaging, and Unconventional Imaging Sensor Systems, 746809 (24 August 2009); doi: 10.1117/12.828580
Show Author Affiliations
Kevin D. Ridley, QinetiQ Ltd. (United Kingdom)
Geoffrey D. de Villiers, QinetiQ Ltd. (United Kingdom)
Douglas A. Payne, QinetiQ Ltd. (United Kingdom)
Rebecca A. Wilson, QinetiQ Ltd. (United Kingdom)
Christopher W. Slinger, QinetiQ Ltd. (United Kingdom)

Published in SPIE Proceedings Vol. 7468:
Adaptive Coded Aperture Imaging, Non-Imaging, and Unconventional Imaging Sensor Systems
David P. Casasent; Jean J. Dolne; Stanley Rogers; Thomas J. Karr; Victor L. Gamiz, Editor(s)

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