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Table 5 Image quality and Hamming distances.

From: Iris Recognition: The Consequences of Image Compression

Image Q uality HD (versus Original) Bits compared Decidability, ()
Original 0.9395 0.0 All unoccluded bits 5.06
25 : 1 0.8743 0.023354 728 4.65
50 : 1 0.6713 0.025097 1036 4.47
75 : 1 0.6220 0.044146 1042 4.13
100 : 1 0.5687 0.092567 713 3.83