Computational imaging with diffractive optics
department or school: Science, Faculty of
department or school: Computer Science, Department of
data provider: DSpace
degree campus: UBCV
creator: Peng, Yifan
issued: 2018-04-13T15:16:07Z
issued: 2018
related degree: Doctor of Philosophy - PhD
degree grantor: University of British Columbia
description: Diffractive optical elements (DOEs) have been studied extensively in optics for decades, but have recently received a lot of renewed interests in the context of computational imaging and computational display because they can drastically reduce the size and weight of devices. However, the inherent strong dispersion is an obstacle that limits the use of DOEs in full spectrum imaging, causing unacceptable color fidelity loss in the captured or reconstructed images. Despite the benefits of facilitating compact form factors, DOEs have sufficient degrees of freedom that one can manipulate to encode the desirable light modulation functionality. In this dissertation we theoretically and experimentally investigate the practicability of introducing numerical optimization into the design procedure of optics, to enable a variety of diffractive optics subject to different application scenarios. Regarding imaging applications, we first validate the practicality of introducing diffractive-refractive hybrid elements as simplified optics in conventional computational imaging. We re-implement a cross-channel based deconvolution to correct the chromatic aberration. The full fabrication cycle of photolithography technique is developed, serving as the basis for all designs. Then, the desirable focal powers in both spectral and spatial domain are encoded onto the DOEs. Precisely, we develop the diffractive achromat that balances the focusing contributions in full visible spectrum. The color fidelity can thus be well preserved. Meanwhile, we develop the encoded lenses that provide focus tunable imaging ability and multi-focal sweep imaging compromise. The trade-off light loss and residual aberrations are tackled by a deconvolution step. In addition, we extend the design paradigm from image capture to image display, where the holograms of visualization of multiple narrowband spectra are encoded onto a pair of ultrathin diffractive phase plates. The mix-and-match scheme of designing high d…
aggregated CHO: https://circle.library.ubc.ca/rest/handle/2429/65337
note: Computational Imaging with Diffractive OpticsbyYifan PengMSc, Zhejiang University, 2013BE, Zhejiang University, 2010A THESIS SUBMITTED IN PARTIAL FULFILLMENTOF THE REQUIREMENTS FOR THE DEGREE OFDoctor of PhilosophyinTHE FACULTY OF GRADUATE AND POSTDOCTORALSTUDIES(Computer Science)The University of British Columbia(Vancouver)April 2018c© Yifan Peng, 2018AbstractDiffractive optical elements (DOEs) have been studied extensively in optics fordecades, but have recently received a lot of renewed interests in the context ofcomputational imaging and computational display because they can drastically re-duce the size and weight of devices. However, the inherent strong dispersion is anobstacle that limits the use of DOEs in full spectrum imaging, causing unaccept-able color fidelity loss in the captured or reconstructed images. Despite the benefitsof facilitating compact form factors, DOEs have sufficient degrees of freedom thatone can manipulate to encode the desirable light modulation functionality.In this dissertation we theoretically and experimentally investigate the practi-cability of introducing numerical optimization into the design procedure of optics,to enable a variety of diffractive optics subject to different application scenarios.Regarding imaging applications, we first validate the practicality of introducingdiffractive-refractive hybrid elements as simplified optics in conventional compu-tational imaging. We re-implement a cross-channel based deconvolution to correctthe chromatic aberration. The full fabrication cycle of photolithography techniqueis developed, serving as the basis for all designs.Then, the desirable focal powers in both spectral and spatial domain are en-coded onto the DOEs. Precisely, we develop the diffractive achromat that balancesthe focusing contributions in full visible spectrum. The color fidelity can thus bewell preserved. Meanwhile, we develop the encoded lenses that provide focus tun-able imaging ability and multi-focal sweep imaging…
has type: Thesis/Dissertation
date issued: 2018-05
is shown at: 10.14288/1.0365608
language: eng
degree discipline: Computer Science
provider: Vancouver : University of British Columbia Library
publisher: University of British Columbia
rights: Attribution-NonCommercial-NoDerivatives 4.0 International
rights URI: http://creativecommons.org/licenses/by-nc-nd/4.0/
scholar level: Graduate
type: Text
identifier URI: http://hdl.handle.net/2429/65337