Modify some lines related to the evaluation of the ellipse #22
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After trying this detector on some dataset, I found that there are many pupil images which have a very clear pupil, but no pupil could be detected to exist.
So I found out the evaluation formulas which lead to the elimination of the possible pupil candidates. And I think that some operations in these formulas are intended to be double, so I modified some variables to double data type to make it a double operation.