OpenCV 4.1.2

OpenCV 4.1.2 have been released!

Release highlights

Google Summer of Code (GSoC) projects integrated:
- Threading and SIMD optimizations in OpenCV.js
- Learning-based super-resolution module
Improvements in dnn module:
- Added higher level API with automatic pre- and post-processing (part of GSoC project)
- Supported InferenceEngine backend from OpenVINO 2019R3
Added SIMD support for MIPS platform via universal intrinsics mechanism
More optimizations across the library: dotProd, FAST, HOG, Pyramid-LK, norm, warpPerspective, etc.
Aruco: improved detection accuracy for white markers and added standalone pattern generator tool
Improved accuracy of QR-code detection algorithm

More details can be found in the Changelog.

Most of bugfixes and improvements have made their way to both 3.4 and master branches.

Contributors

Big thanks to everybody who contributed (here is the incomplete list of patch authors; please report if you contributed but do not see your name here):

opencv

Alexander Alekhin, Dmitry Kurtaev, Maksim Shabunin, Vitaly Tuzov, Paul E. Murphy, Andrey Golubev, Lubov Batanina, Suleyman TURKMEN, AsyaPronina, luz.paz, Anton Potapov, Chip Kerchner, ChipKerchner, Sebastián Gurin, smirnov-alexey, Braedy Kuzma, Dmitry Budnikov, Hugo Lindström, John Smith, Marcin Tolysz, Talamanov, Anatoliy, TheGoddessInari, Tomoaki Teshima, Victor Romero, Zyrin, atinfinity, dab0bby, ilbalance, APrigarina, Alexey Smirnov, Andrew Ryrie, Brandon, Daniel Kapusi, David Carlier, Diego, Dmitry Matveev, Douwe Gelling, Elms, Everton Constantino, Evgeny Latkin, Giles Payne, Ilya Lavrenov, Jaime, Jake Howard, Kazuma Furuhashi, LaurentBerger, Mark Harfouche, Martti Laine, Matt Bennett, Matthias Gehre, OrestChura, Philippe FOUBERT, Pinaev Danil, Prakhar Varshney, Rosen Penev, Sayed Adel, Sean McBride, Sebastián Gurín, Thang Tran, Vishal Chiluka, Wenzhao Xiang, Wise86, andrey-golubev, ann, berak, collin, craterkamath, dcouwenh, fishjam, huihut, mipsopen-fwu, takacsd, xitong, yaohai [姚海]

opencv_contrib

Alexander Alekhin, Maksim Shabunin, Marcin Tolysz, Tomoaki Teshima, Daniel Canelhas, Fanny Monori, Geert Willems, Graham Reeves, Josh Chien, Moeed, Nicolas Abril, Nuzhny007, Paul Debus, Rajkiran Natarajan, SSE4, Suleyman TURKMEN, Tobias Senst, Vishal Bhaskar Chiluka, Xavier Weber, adilfaqah, berak, clunietp, kqwyf, lizeth huertas