* Checker for empty region

* Update trackerKCF.cpp

* Update trackerKCF.cpp

* Update trackerKCF.cpp

* fix whitespace

Update peilin.cpp

The Fast Bilateral Filter (#1819)

PR is created by: berak <px1704@web.de>
based on work https://github.com/opencv/opencv_contrib/pull/1317

* fbs_filter v1.0 has been contributed

* use boost unordered_map

* add brief description for fbs_filter

* fix format

* fix channels bug

* modify doc for fbs_filter

* check c++ 11

* asDiagonal -> diagonal

* rosolve warning

* fix eigen3 dependency

* Eigen/Core

* test HEAV_EIGEN

* setZero bug

* unordered_map test

* fix macro bug

* fix boost not found

* fix eigen macro bug

* fix eigen macro bug

* fix eigen macro bug

* fix eigen macro bug

*  add test file

*  fix test macro

*  fix test macro

*   add test

*   add test

* add sample colorize

* fix macro

*  fix colorize.cpp

*  fix colorize.cpp

*  fix colorize.cpp

*  fix colorize.cpp

* add fbs filter demo

* add fbs filter demo

* add fbs filter demo

* use fgsfilter for guess

* add parameter num_iter and max_tol

* add a option for colorize sample

* add  bibtex

* add  bibtex

* fix a colorize demo bug

* size optimize

* taking over the fast bilateral solver

* taking over the fast bilateral solver

* try to fix test_fbs_filter

* missed a bib bracket

  * fix test failure of cudaimgproc convert color bgr2lab series

original commit: https://github.com/opencv/opencv/commit/944710de4e9f8149a4ddb6cee908f9004d7f8702

[moved from opencv] CUDA/BgSegm: fix the threshold of MOG2.Update test when detectShadow=true (opencv/opencv#12762)

original commit: https://github.com/opencv/opencv/commit/c4d434fd6f42edd955429990354191200897204d