Document Type

Dissertation

Date of Degree

Spring 2015

Degree Name

PhD (Doctor of Philosophy)

Degree In

Electrical and Computer Engineering

First Advisor

Thomas Schnell

Abstract

Light field photography offers a new approach to digitally captured images. These commercially available cameras are able to capture the 4D light field in a single image. This allows for a variety of image processing capabilities that traditional cameras do not offer. For example, the image can be digitally refocused after it is captured and its depth can be estimated. In terms of application, these capabilities could be beneficial on airborne platforms. However, a limitation of currently available light field cameras is that they are not fully functional at medium or long ranges. If these cameras were to capture light fields at longer ranges, they would have a practical application when mounted on low-flying aircrafts. This dissertation takes current light field photography techniques and modifies them so they work better to capture medium-range images. The majority of cameras that capture the 4D light field use a microlens array to modulate the incoming light before it hits the image sensor. Previous work using printed modulation masks garnered the same effect obtained by microlens arrays. This dissertation details the development of a modulation mask that has medium-range applications. A new way of extracting the 4D light field from raw images that uses a digital Fourier transform is presented. This method works for images captured with microlens arrays and printed mask cameras. Two prototype cameras were built and tested to demonstrate some of these concepts. The concepts demonstrated by these cameras could be used in the future designs of light field cameras.

Public Abstract

Light field photography offers a new way of looking at digitally captured images. These commercially available cameras allow for image processing capabilities that traditional camera do not offer. For example, the image can be digitally refocused after it is captured, and its depth can be estimated. In terms of application, these capabilities could be beneficial on airborne platforms. However, a limitation of currently available light field cameras is that they are not functional at medium or long ranges. This dissertation takes current light field photography techniques and modifies them so that the cameras are better able to capture medium-range images. If these cameras were to capture light fields at longer ranges, they would have a practical application when mounted on low-flying aircraft. Two prototype cameras were built and tested to demonstrate some of these concepts. The concepts demonstrated by these cameras could be used in the future designs of light field cameras.

Keywords

publicabstract, Airborne, Light Field, Photography

Pages

xii, 144 pages

Bibliography

Includes bibliographical references (pages 131-133).

Comments

This thesis has been optimized for improved web viewing. If you require the original version, contact the University Archives at the University of Iowa: http://www.lib.uiowa.edu/sc/contact/.

Copyright

Copyright 2015 Michael Dominick Yocius

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