Unroll pyrUp kernel
Removed useless multiplication by 4
some optimizaions of cv::pow
optimized cv::calcHist
eliminated convertTo
optimized histogram merging
cv::equalizeHist
Added support for 3-channels
fixed cv::warpPerspective
Don't build CUDA modules stubs by default (use `-DBUILD_CUDA_STUBS=ON` if need them)
invoking OCL before IPP
Remove pre_invalid parameter
Merge pull request #2855 from ilya-lavrenov:tapi_warpp_fix
Merge pull request #2865 from ilya-lavrenov:morph
Join kernel code for int and float destination types
fixed usage of reshape
optimized cv::boxFilter
Small refactoring
Fix pointer conversion
Merge pull request #2849 from ElenaGvozdeva:ocl_matchTemplate_3cn