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This paper focus on noncooperative iris recognition, i.e., the capture of iris images at large distances, under less controlled lighting conditions, and without active participation of the subjects. This increases the probability of capturing very heterogeneous images (regarding focus, contrast, or brightness) and with several noise factors (iris obstructions and reflections). Current iris recognition systems are unable to deal with noisy data and substantially increase their error rates, especially the false rejections, in these conditions. We propose an iris classification method that divides the segmented and normalized iris image into six regions, makes an independent feature extraction and comparison for each region, and combines each of the dissimilarity values through a classification rule. Experiments show a substantial decrease, higher than 40 percent, of the false rejection rates in the recognition of noisy iris images.
Iris classification, noncooperative iris recognition, biometrics.

L. A. Alexandre and H. Proen?, "Toward Noncooperative Iris Recognition: A Classification Approach Using Multiple Signatures," in IEEE Transactions on Pattern Analysis & Machine Intelligence, vol. 29, no. , pp. 607-612, 2007.
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