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Optics Express

Optics Express

  • Editor: Michael Duncan
  • Vol. 14, Iss. 24 — Nov. 27, 2006
  • pp: 11551–11565

Automatic source camera identification using the intrinsic lens radial distortion

Kai San Choi, Edmund Y. Lam, and Kenneth K. Y. Wong  »View Author Affiliations


Optics Express, Vol. 14, Issue 24, pp. 11551-11565 (2006)
http://dx.doi.org/10.1364/OE.14.011551


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Abstract

Source camera identification refers to the task of matching digital images with the cameras that are responsible for producing these images. This is an important task in image forensics, which in turn is a critical procedure in law enforcement. Unfortunately, few digital cameras are equipped with the capability of producing watermarks for this purpose. In this paper, we demonstrate that it is possible to achieve a high rate of accuracy in the identification by noting the intrinsic lens radial distortion of each camera. To reduce manufacturing cost, the majority of digital cameras are equipped with lenses having rather spherical surfaces, whose inherent radial distortions serve as unique fingerprints in the images. We extract, for each image, parameters from aberration measurements, which are then used to train and test a support vector machine classifier. We conduct extensive experiments to evaluate the success rate of a source camera identification with five cameras. The results show that this is a viable approach with high accuracy. Additionally, we also present results on how the error rates may change with images captured using various optical zoom levels, as zooming is commonly available in digital cameras.

© 2006 Optical Society of America

OCIS Codes
(080.2720) Geometric optics : Mathematical methods (general)
(100.2000) Image processing : Digital image processing
(100.5010) Image processing : Pattern recognition

History
Original Manuscript: September 13, 2006
Revised Manuscript: November 8, 2006
Manuscript Accepted: November 9, 2006
Published: November 27, 2006

Citation
Kai San Choi, Edmund Y. Lam, and Kenneth K. Y. Wong, "Automatic source camera identification using the intrinsic lens radial distortion," Opt. Express 14, 11551-11565 (2006)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-14-24-11551


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