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Proceedings Paper

Impact of out-of-focus blur on iris recognition
Author(s): Nadezhda Sazonova; Stephanie Schuckers; Peter Johnson; Paulo Lopez-Meyer; Edward Sazonov; Lawrence Hornak
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Paper Abstract

Iris recognition has expanded from controlled settings to uncontrolled settings (on the move, from a distance) where blur is more likely to be present in the images. More research is needed to quantify the impact of blur on iris recognition. In this paper we study the effect of out-of-focus blur on iris recognition performance from images captured with out-of-focus blur produced at acquisition. A key aspect to this study is that we are able to create a range of blur based on changing focus of the camera during acquisition. We quantify the produced out-of-focus blur based on the Laplacian of Gaussian operator and compare it to the gold standard of the modulation transfer function (MTF) of a calibrated black/white chart. The sharpness measure uses an unsegmented iris images from a video sequence with changing focus and offers a good approximation of the standard MTF. We examined the effect of the 9 blur levels on iris recognition performance. Our results have shown that for moderately blurry images (sharpness at least 50%) the drop in performance does not exceed 5% from the baseline (100% sharpness).

Paper Details

Date Published: 17 May 2011
PDF: 8 pages
Proc. SPIE 8029, Sensing Technologies for Global Health, Military Medicine, Disaster Response, and Environmental Monitoring; and Biometric Technology for Human Identification VIII, 80291S (17 May 2011); doi: 10.1117/12.887052
Show Author Affiliations
Nadezhda Sazonova, The Univ. of Alabama at Tuscaloosa (United States)
Stephanie Schuckers, Clarkson Univ. (United States)
Peter Johnson, Clarkson Univ. (United States)
Paulo Lopez-Meyer, The Univ. of Alabama at Tuscaloosa (United States)
Edward Sazonov, The Univ. of Alabama at Tuscaloosa (United States)
Lawrence Hornak, West Virginia Univ. (United States)


Published in SPIE Proceedings Vol. 8029:
Sensing Technologies for Global Health, Military Medicine, Disaster Response, and Environmental Monitoring; and Biometric Technology for Human Identification VIII
B. V. K. Vijaya Kumar; Sárka O. Southern; Kevin N. Montgomery; Salil Prabhakar; Arun A. Ross; Carl W. Taylor; Bernhard H. Weigl, Editor(s)

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