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Title: Principles and applications of wavefront coding
Author: Muyo Nieto, Gonzalo D.
ISNI:       0000 0001 3437 8296
Awarding Body: Heriot-Watt University
Current Institution: Heriot-Watt University
Date of Award: 2007
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The aim of the work reported in this thesis was to investigate the physical principles and potential applications of wavefront coding. This technique enables extended depth of field and greatly reduced sensitivity to defocus-related and higher-order aberrations whilst maintaining diffraction-limited resolution in incoherent imaging systems. Wavefront· coding involves the introduction of an asymmetric refractive mask close to the aperture stop so as to encode the image with a specific point spread function that, when combined with decoding of the recorded image, can enable accurate image acquisition even in the presence of aberrations. In practical imaging systems, this enhancement is subject to a range of constraints and limitations which have been neglected in previous works. We show that although-wavefront coding has sometimes been presented as a panacea, it is more realistic to consider it as an additional parameter in the optimisation process. This research explores the trade offs involved in the application of wavefront coding to lowcost imaging systems for use in t,he thermal infrared and visible imaging systems, showing how very useful performance enhancements can be achieved in practical systems. Some of the original contributions of this work include the design of new phase masks, a new understanding of the fundamental physical principles in terms of the decomposition of the optical transfer function, appraisal of the restoration issues (detector sampling, noise amplification and artefacts in the digitally processed image) and the design and manufacture of a wavefront-coded infrared singlet.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available