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Proceedings Paper

Case studies and further improvements on source camera identification
Author(s): Kenji Kurosawa; Kenro Kuroki; Ken’ichi Tsuchiya; Naoaki Igarashi; Norimitsu Akiba
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Paper Abstract

Actual case examples and further improvements on source camera identification are shown. There are three specific topics in this paper: (a) In order to improve performance of source camera identification, the hybrid identification scheme using both dark current non-uniformity (DCNU) and photo-response non-uniformity (PRNU) is proposed. The experimental results indicated that identification performance would be improved by properly taking advantage of their features; (b) Source camera identification using non-uniform nature of the CCD charge transfer circuit is proposed. The experimental results with twenty CCD modules of the same model showed that individual camera identification for dark images was possible by the proposed method. Furthermore, it was shown that the proposed method had higher discrimination capability than the method using pixel non-uniformity when the number of recorded image was small; (c) The authors have been performed source camera identification in the five actual criminal cases, such as homicide case, and so on. The analytical procedure was a sequential examination of hot pixel coordinates validation followed by the similarity evaluation of sensor noise pattern. The authors could clearly prove that the questioned criminal scenes had been recorded by the questioned cameras in four cases of the five.

Paper Details

Date Published: 22 March 2013
PDF: 14 pages
Proc. SPIE 8665, Media Watermarking, Security, and Forensics 2013, 86650C (22 March 2013); doi: 10.1117/12.2003311
Show Author Affiliations
Kenji Kurosawa, National Research Institute of Police Science (Japan)
Kenro Kuroki, National Research Institute of Police Science (Japan)
Ken’ichi Tsuchiya, National Research Institute of Police Science (Japan)
Naoaki Igarashi, National Research Institute of Police Science (Japan)
Norimitsu Akiba, National Research Institute of Police Science (Japan)


Published in SPIE Proceedings Vol. 8665:
Media Watermarking, Security, and Forensics 2013
Adnan M. Alattar; Nasir D. Memon; Chad D. Heitzenrater, Editor(s)

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