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کامپیوتر و شبکه::
مقدار فاصلهی همینگ
In order to account for rotational inconsistencies, when the Hamming distance of two templates is calculated, one template is shifted left and right bit-wise and a number of Hamming distance values are calculated from successive shifts.
From the calculated Hamming distance values, only the lowest is taken, since this corresponds to the best match between two templates.
In other words 192,699 Hamming distance values are calculated.
With 10 shifts left and right, that is 20 shifts in total, the 'CASIA-a' data set performs 3,853,980 unique comparisons when calculating all possible inter-class values, but only 192,699 Hamming distance values are used.
Uniqueness was determined by comparing templates generated from different eyes to each other, and examining the distribution of Hamming distance values produced.
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