Detecting photo manipulation on signs and billboards

The manipulation of text on a sign or billboard is relatively easy to do in a way that is perceptually convincing. When text is on a planar surface and imaged under perspective projection, the text undergoes a specific distortion. When text is manipulated, it is unlikely to precisely satisfy this ge...

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Bibliographic Details
Main Authors: Conotter, V, Boato, G, Farid, H
Format: Conference Proceeding
Language:English
Subjects:
Accuracy
Computer science
Conferences
Digital Forensics
Digital Tampering
Estimation
Forensics
Image reconstruction
Transforms
Online Access:Request full text
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Description
Summary:The manipulation of text on a sign or billboard is relatively easy to do in a way that is perceptually convincing. When text is on a planar surface and imaged under perspective projection, the text undergoes a specific distortion. When text is manipulated, it is unlikely to precisely satisfy this geometric mapping. We describe a technique for detecting if text in an image obeys the expected perspective projection, deviations from which are used as evidence of tampering.
ISSN:1522-4880
2381-8549
DOI:10.1109/ICIP.2010.5652906