fixed tests for ocl::warpAffine and ocl::warpPerspective
fix bug #1480
fixed ocl::flip
ocl example typo
Merge pull request #1698 from ilya-lavrenov:ocl_warp
Merge pull request #1701 from alalek:ocl_fix_canny
Merge pull request #1703 from bitwangyaoyao:2.4_fix1480
Merge pull request #1705 from ilya-lavrenov:ocl_flip
Merge pull request #1706 from ilya-lavrenov:example_fix
ocl: update filter tests
ocl: rewrite boxFilter
ocl: rewrite filter2D
ocl: fix morph filters
ocl: filters: update documentation
fixed OpenCL morph operations for case when kernel does not have zero element