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کامپیوتر و شبکه::
توزیع درون ردهای
Decidability d' is a distance measured in standard deviations and is a function of the magnitude of difference between the mean of the intra-class distribution /J.s, and the mean of the inter-class distribution fis, and also the standard deviation of the intraclass and inter-class distributions, o\ and CF2D respectively.
The false accept rate is defined by the normalised area between 0 and the separation point, K, in the inter-class distribution Pdiff- The false reject rate is defined as the normalised area between the separation point, K, and 1 in the intra-class distribution Psarne.
Also, the lower optimum decidability value for the 'LEI-a' data set can be attributed to undetected eyelashes within the iris region, which result in an increased standard deviation of the intra-class distribution and thus lower decidability value.
The optimum number of template shifts to account for rotational inconsistencies can be determined by examining the mean and standard deviation of the intra-class distribution.
As the number of shifts increases, the mean of the intra-class distribution will converge to a constant value, since all rotational inconsistencies would have been accounted for.
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