Removed workaround for Intel platform.
added 3 vs 4 channels performance tests
Merge pull request #2483 from ilya-lavrenov:tapi_3_vs_4
Merge pull request #2481 from akarsakov:fix_hog_intel
Merge pull request #2428 from alalek:ocl_copyMakeBorder_3channels
Merge pull request #2479 from alalek:ocl_compare_scalar
TAPI: added perf test for stitching
TAPI: stitching, replaced Mat->UMat/_Array
features2d: workaround for 'utrainDescCollection' issue (PR #2142)
TAPI: stitching: improve warpers
TAPI: stitching: workaround for problem getUMat() call
TAPI: stitching: optimize exposure
TAPI: stitching: optimize compare operation
stitching: use BORDER_CONSTANT in warp
stitching: extend logging
TAPI: stiching: add custom OpenCL kernels for MultiBandBlender
external changes
stitching: allow to use dynamic DescriptorMatcher
TAPI: stitching: blender: fix OpenCL path & adjust test condition
ocl: workaround for synchronization issue in ::map()