As the type of `targetPatch` and `searchPatch` is CV_8UC3, subtracting 128 from them will saturate all values smaller than 128 to zero.

Implementation of CSR-DCF tracker (#1552)

* Initial commit for CSR-DCF tracker implementation

* Fixes for automatic build

* General code fixes

* Removed unused parameters. Added CSRT to automatic tests.

* Fixed VS build warnings. Fixed a bug with gray sequences.

* Fixed VS build errors for samples file.

so we can use the alpha channel for e.g. masking

useful when uchar precision is not enough

* support custom dictionaries via python bindngs

* make markerSize and maxCorrectionBits writeable

Segmentation hfs (#1417)

* add hfs module

* fix some warning

* fix a CMakeLists.txt bug

* fix some warnings

* try to fix some warning

* fix static check warning

* final fix

also set the intrinsic in the AR demo