the latter assumes centered FOV, which is not the case

* fixed bug when norm less than eps where float array elements were left uninitialized

* cast double to float in fixing ppf norm=0 segmantation fault

* set array values 3,4,5 for normals = 0 in case of norm<eps to fix ppf segmentation fault bug

Apriltag (#1570)

* doCornerRefinement to CornerRefinementMethod :: detected contours points are used to detect the corners

* some little corrections

* samples edited

* documented :)

* tabs corrected

* Docu corrections

* refinement for all candidates

* refinement for all candidates :: copy paste error corrected

* comment

* apriltag

* whitespace corrected

* corr ini

* correction :: warnings, c4244, preprocDirect, ...

* try to ignore 4244, fix 2131, add test, and ...

* try to ignore 4244

* test duplicate deleted

* corrected test, warnings

* test :: correction

* warnings

* warnings and test

* warnings

* perspective test, warning corrections

* warning a_q_t

* warning

* warning

* 3 clause BSD license

* stacksz and typo

* eliminate build warnings

- cv::fastAtan2()
- cvFloor()

* small code refactoring

* fix isfinite()

* get rid of manual calloc/free calls

* update file headers

* Enabled FastHoughTransform export to python.

* Enabled HoughPoint2Line export

* Update fast_hough_transform.hpp

deleted TODO

* Fixed indentation after enabling exporting.