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Photo forensics from partial constraints / by Eric Lee.

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Author	Kee, Eric.
Title	Photo forensics from partial constraints / by Eric Lee.
Date	2013
Abstract	A variety of forensic methods have been developed to identify falsified photos, each unified by the ability to estimate and detect properties of a photo that are perturbed by forgery. There exist, however, many photos in which the required properties cannot be estimated. We present an approach to detect forgery in these photos. We use this approach to detect physically inconsistent shadows and shading in photos for which it is not possible to estimate the associated lighting properties. Specifically, we develop a method to detect inconsistent shadows cast by point and area light sources when a strict shadow-to-object correspondence cannot be estimated. We further develop a method to detect inconsistencies between shadows and the shading on objects when object geometry is only partially known, and when objects are photographed under unknown perspective. We conclude by describing prior methods that can be generalized to analyze photos in which estimation is not possible.
Description	v, 118 leaves : ill. (some col.) 28 cm.
Format	application/pdf
Advisor	Hany Farid, Devin Balkcom, Michael Black, Lorenzo Torresani
College	Dartmouth College. Department of Computer Science.
Issuing Body	Dartmouth Dissertations are made available through the Dartmouth Digital Library.
Degree	Thesis (Ph.D.)--Dartmouth College.
Copyright	All rights reserved. No part of this book may be reproduced in any form by any electronic or mechanical means without permission in writing from the author.
DOI	http://dx.doi.org/10.1349/ddlp.977

Title	Page 1
Full Text	Photo Forensics from Partial Constraints A Thesis Submitted to the Faculty in partial fulfillment of the requirements for the degree of Doctor of Philosophy in Computer Science by Eric Kee DARTMOUTH COLLEGE Hanover, New Hampshire April, 2013 Examining Committee: (chair) Hany Farid, Ph.D. Devin Balkcom, Ph.D. Michael Black, Ph.D. Lorenzo Torresani, Ph.D. F. Jon Kull, Ph.D. Dean of Graduate Studies

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Photo forensics from partial constraints / by Eric Lee.

Photo forensics from partial constraints / by Eric Lee.