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Template Aging Phenomenon in Iris Recognition

Figure 1

Figure 1
Images of the Same Eye from 2008 (top) and 2011 (bottom). Images were acquired using an LG 4000 iris sensor.

Figure 2

Figure 2
Selection of a best-performing matcher to use in template-aging experiments.

Figure 3

Figure 3
Comparison of Short- and Long-Term FNMR for 2008–2009.

Figure 4

Figure 4
Comparison of Short- and Long-Term FNMR for 2008–2010.

Figure 5

Figure 5
Comparison of Short- and Long-Term FNMR for 2008–2011.

Figure 6

Figure 6
Diagram of the Structure of the Eye. (Courtesy of National Eye Institute, National Institutes of Health; Ref#: NEA05).

Figure 7

Figure 7
Sequence of Iris Images Ordered By Pupil Dilation Ratio. This video is formed from a sequence of iris images taken at different times and sequenced in order of increasing pupil dilation ratio. It is clear that there are changes in iris texture based on pupil dilation, and that larger differences in texture occur for larger differences in dilation (please see multimedia package to view video).

Figure 8

Figure 8
Difference in Pupil Dilation for 2008–2008, 2008–2009, 2008–2010 and 2008–2011. The 2008–2008 value is the mean difference in dilation ratio between two images of the same eye acquired in 2008, in units of the VeriEye SDKŠs PupilIrisRatio value, which has a range of 0 to 255; similarly with 2008–2009, 2008–2010 and 2008–2011.

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