- use "random" area on input image
- avoid duplicate cases

* Added performance tests for hal::norm functions

* Added sum of absolute differences intrinsic

* norm implementation updated to use wide universal intrinsics

* improve and fix v_reduce_sad on VSX

GAPI (fluid): Median blur optimization (#13329)

* GAPI (fluid): Median blur optimization: reference 3x3

* GAPI (fluid): Median blur optimization: CPU dispatcher

* GAPI (fluid): Median blur optimization: manual CV_SIMD

G-API rename GPU backend to OCL backend (#13240)

* renaming draft

* inline namespace instead non-safe define

* more back compatibility

* Updates after review from Dmitry

GAPI (fluid): Erode/Dilate optimization, part 2 (#13319)

* GAPI (fluid): Erode/Dilate optimization: hard-code 3x3 case

* GAPI (fluid): Erode/Dilate optimization: CPU dispatcher

* GAPI (fluid): Erode/Dilate optimization: speed-up 10-15x times with CV_SIMD

* GAPI (fluid): Erode/Dilate optimization: 20-30% speed-up

GAPI (fluid): Erode/Dilate optimization (#13315)

* GAPI (fluid): Erode/Dilate optimization: hard-code 3x3 case

* GAPI (fluid): Erode/Dilate optimization: CPU dispatcher

* GAPI (fluid): Erode/Dilate optimization: speed-up 10-15x times with CV_SIMD

GAPI (fluid): Filter 2D optimization (#13290)

* GAPI (fluid): Filter 2D optimization: speedup 13x if float, 2x if integral

* GAPI (fluid): Filter 2D speedup 8x if output is short/ushort

* GAPI (fluid): Filter 2D speedup 7x if output is uchar

* GAPI (fluid): Filter 2D optimization: fixed compiler warnings

* GAPI (fluid): fix compiler warnings on Mac

* GAPI (fluid): fix compiler warnings on Mac

* GAPI (fluid): fix compiler errors on VS2015

* GAPI (fluid): fix compiler errors on VS2015

* GAPI (fluid): fix compiler errors on VS2015