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Unexpected Artifacts in a Digital Photograph

Unexpected Artifacts in a Digital Photograph

Matthew J. Sorell
Copyright: © 2009 |Volume: 1 |Issue: 1 |Pages: 14
ISSN: 1941-6210|EISSN: 1941-6229|ISSN: 1941-6210|EISBN13: 9781615202218|EISSN: 1941-6229|DOI: 10.4018/jdcf.2009010103
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MLA

Sorell, Matthew J. "Unexpected Artifacts in a Digital Photograph." IJDCF vol.1, no.1 2009: pp.45-58. http://doi.org/10.4018/jdcf.2009010103

APA

Sorell, M. J. (2009). Unexpected Artifacts in a Digital Photograph. International Journal of Digital Crime and Forensics (IJDCF), 1(1), 45-58. http://doi.org/10.4018/jdcf.2009010103

Chicago

Sorell, Matthew J. "Unexpected Artifacts in a Digital Photograph," International Journal of Digital Crime and Forensics (IJDCF) 1, no.1: 45-58. http://doi.org/10.4018/jdcf.2009010103

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Abstract

This article investigates an unexpected phenomenon observed in a recent digital photograph, in which the logo of a non-sponsoring sports company appears on the jersey of a famous football player in just one of a sequence of images. After eliminating deliberate image tampering as a cause, a hypothetical sequence of circumstances is proposed, concerning the lighting, dominant colours, infrared sensitivity, optical preprocessing, image enhancement and JPEG compression. The hypotheses are tested using a digital SLR camera. The investigation is of interest in a forensic context, firstly as a possible explanation in case such a photograph is observed, and secondly to be able to confirm or refute claims of such artifacts put forward claiming that a hypothetical image is not really what it claims to be.

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