Merge pull request #17417 from vpisarev:fix_fitellipse
* improved fitEllipse and fitEllipseDirect accuracy in singular or close-to-singular cases (see issue #9923) * scale points using double precision * added normalization to fitEllipseAMS as well; fixed Java test case by raising the tolerance (it's unclear what is the correct result in this case). * improved point perturbation a bit. make the code a little bit more clear * trying to fix Java fitEllipseTest by slightly raising the tolerance threshold * synchronized C++ version of Java's fitEllipse test * removed trailing whitespaces
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