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Proceedings Paper

3D computational ghost imaging
Author(s): Matthew P. Edgar; Baoqing Sun; Richard Bowman; Stephen S. Welsh; Miles J. Padgett
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Paper Abstract

Computational ghost imaging is a technique that enables lensless single-pixel detectors to produce images. By illuminating a scene with a series of patterns from a digital light projector (DLP) and measuring the reflected or transmitted intensity, it is possible to retrieve a two-dimensional (2D) image when using a suitable computer algorithm. An important feature of this approach is that although the light travels from the DLP and is measured by the detector, the images produced reveal that the detector behaves like a source of light and the DLP behaves like a camera. By placing multiple single-pixel detectors in different locations it is possible to obtain multiple ghost images with different shading profiles, which together can be used to accurately calculate the three-dimensional (3D) surface geometry through a photometric stereo techniques. In this work we show that using four photodiodes and a 850nm source of illumination, high quality 3D images of a large toy soldier can be retrieved. The use of simplified lensless detectors in 3D imaging allows different detector materials and architectures to be used whose sensitivity may extend beyond the visible spectrum, at wavelengths where existing camera based technology can become expensive or unsuitable.

Paper Details

Date Published: 16 October 2013
PDF: 6 pages
Proc. SPIE 8899, Emerging Technologies in Security and Defence; and Quantum Security II; and Unmanned Sensor Systems X, 889902 (16 October 2013); doi: 10.1117/12.2032739
Show Author Affiliations
Matthew P. Edgar, Univ. of Glasgow (United Kingdom)
Baoqing Sun, Univ. of Glasgow (United Kingdom)
Richard Bowman, Univ. of Glasgow (United Kingdom)
Univ. of Cambridge (United Kingdom)
Stephen S. Welsh, Univ. of Glasgow (United Kingdom)
Miles J. Padgett, Univ. of Glasgow (United Kingdom)

Published in SPIE Proceedings Vol. 8899:
Emerging Technologies in Security and Defence; and Quantum Security II; and Unmanned Sensor Systems X
Edward M. Carapezza; Keith L. Lewis; Mark T. Gruneisen; Miloslav Dusek; Richard C. Hollins; Thomas J. Merlet; John G. Rarity, Editor(s)

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