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کامپیوتر و شبکه::
ناهمسانیهای چرخشی
Even though the homogenous rubber sheet model accounts for pupil dilation, imaging distance and non-concentric pupil displacement, it does not compensate for rotational inconsistencies.
As in Daugman's rubber sheet model, removing rotational inconsistencies is performed at the matching stage and will be discussed in the next chapter.
Note that rotational inconsistencies have not been accounted for by the normalisation process, and the two normalised patterns are slightly misaligned in the horizontal (angular) direction.
Rotational inconsistencies will be accounted for in the matching stage.
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.
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