fix missing 0.5 factor in anisotropic segmentation tutorial#18225
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I found a typo in the tutorial "Anisotropic image segmentation by a gradient structure tensor" from the Image Processing module.
A factor 1/2 is missing in the computation of the eigenvalues of the structure tensor. The correct formula is the eq. 4 of this paper:
http://citeseerx.ist.psu.edu/viewdoc/download?doi=10.1.1.104.8552&rep=rep1&type=pdf
This pull request changes the text of the tutorial and the code of the python/cpp samples by inserting the 0.5 x factor.