22 March 2013 Forensic analysis of interdependencies between vignetting and radial lens distortion
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Optical aberrations are an inherent part of all images captured with a digital camera and might form another valuable characteristic to build reliable image forensic methods. Within this paper we focus on vignetting and radial lens distortion and investigate interdependencies between both optical aberrations. Using checkerboards and a homogeneously illuminated white wall as ideal test patterns, we investigate the influence of lens settings and camera orientation. More precisely, we use images of the `Dresden Image Database' and a specifically created data set to investigate relations between the appearance of optical aberrations and lens settings, focal length, focus, and aperture. Our experiments use images of natural scenes to point to general difficulties that have to be considered when vignetting and radial lens distortion are analyzed in realistic scenarios.
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André Fischer, Thomas Gloe, "Forensic analysis of interdependencies between vignetting and radial lens distortion", Proc. SPIE 8665, Media Watermarking, Security, and Forensics 2013, 86650D (22 March 2013); doi: 10.1117/12.2004348; https://doi.org/10.1117/12.2004348


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