Applications of single-pixel imaging

Welsh, Stephen Stewart (2017) Applications of single-pixel imaging. PhD thesis, University of Glasgow.

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Abstract

In this body of work, several single-pixel imaging applications are presented, based on structured light manipulation via a Digital Micromirror Device (DMD) and a single element photodetector (PD). This is commonly known as computational single-pixel imaging, and is achieved by using the measurements made by the PD to weight a series of projected structured light-fields. This indicates the strength of correlation between each light-field, and some object or scene placed in its propagation path. After many iterations the ensemble average of the weighted structured light-field converges to the object. Historically, computational single-pixel imaging has suffered from long image acquisition times and low resolution. Inhibiting the ability of physical systems from competing with conventional imaging in any form. Advances in computer and DMD technology have opened new avenues of research for this novel imaging technique. These advances have been utilised in this work by creating fast acquisition demonstrator systems, which have real world applications, such as multi-wavelength, polarisation, and long-range imaging. Several PDs were added to allow for simultaneous measurement of multiple images in the desired application. For multi-wavelength, RGB and white light illumination was spectrally filtered on three detectors to create full-colour images. While conversely the same multi-detector approach allowed for simultaneous measurement of orthogonal linear polarisation states essential to Stokes' parameter image reconstruction. Differential projection of the structured light-fields further allowed for the single-pixel camera to compensate from some sources of real world noise, such as background illumination. This work demonstrates an evolution of the single-pixel camera. From a system capable of only imaging simple, binary transmissive objects twice per hour and constrained to an optical bench, to a semi portable camera, capable of multiple frames per second 2D reconstructions of 3D scenes over a range of 20 kilometres. These improvements in capability cement the idea that the single-pixel camera is now a viable alternate imaging technology.

Item Type: Thesis (PhD)
Qualification Level: Doctoral
Keywords: Single-pixel camera, ghost imaging, structured light, computational imaging, remote sensing, full-colour imaging, polarisation imaging, METATOY applications, video rate single-pixel reconstruction.
Subjects: Q Science > QC Physics
Colleges/Schools: College of Science and Engineering > School of Physics and Astronomy
Funder's Name: Engineering and Physical Sciences Research Council (EPSRC), Engineering and Physical Sciences Research Council (EPSRC), Engineering and Physical Sciences Research Council (EPSRC), Engineering and Physical Sciences Research Council (EPSRC)
Supervisor's Name: Padgett, Professor Miles
Date of Award: 2017
Depositing User: Mr Stephen S Welsh
Unique ID: glathesis:2017-8369
Copyright: Copyright of this thesis is held by the author.
Date Deposited: 29 Aug 2017 13:52
Last Modified: 06 Oct 2017 09:54
URI: http://theses.gla.ac.uk/id/eprint/8369

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