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Iris Recognition Inherent Binomial Degrees of Freedom

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Document pages: 4 pages

Abstract: The distinctiveness of the human iris has been measured by first extracting aset of features from the iris, an encoding, and then comparing these encodedfeature sets to determine how distinct they are from one another. For example,John Daugman measures the distinctiveness of the human iris at 244 degrees offreedom, that is, Daugman s encoding maps irises into the equivalent of 2 ^ 244distinct possibilities [2]. This paper shows by direct pixel-by-pixelcomparison of high-quality iris images that the inherent number of degrees offreedom embodied in the human iris, independent of any encoding, is at least536. When the resolution of these images is gradually reduced, the number ofdegrees of freedom decreases smoothly to 123 for the lowest resolution imagestested.

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