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Add robust local optical flow (RLOF) implementations (#1940) * Add robust local optical flow (RLOF) implementations which is an improved pyramidal iterative Lucas-Kanade approach. This implementations contains interfaces for sparse optical flow for feature tracking and dense optical flow based on sparse-to-dense interpolation schemes. Add performance and accuracy tests have been implementation as well as documentation with the related publications * - exchange tabs with spaces - fix optflow.bib indentation - remove optflow_o.hpp - change RLOFOpticalFlowParameter interfaces to Ptr<RLOFOpticalFlowParameter> to remove error on building. Fix warnings * introducing precompiler flag RLOD_SSE * remove header that could not be found * remove whitespaces fix perf and accuracy tests * remove x86intrin.h header * fix ios and arm by removing last sse commands * fix warnings for windows compilation * fix documentation RLOFOpticalFlowParameter * integrate cast to remove last warnings * * add create method and function inferfaces to RLOFOpticalFlowParamter to enable python wrapper interfaces * white space fixes / coding style * fix perf test * other changes: precomp.hpp / static * use Matx44f and Vec4f instead of Mat * normSigmas into constants * replace ceil() calls * maximum level is set to 5 so that it is similar value used in the papers * implement paralellized horizontal cross segmentation as used in Geistert2016 * drop dead code * Avoid using "data" and "step" calculations. Use .ptr<mat_type>(row, col) instead. * Avoid using "data" and "step" calculations. Use .ptr<mat_type>(row, col) instead. * bugfix on BEPLK with ica and adapt the accuracy tests * more 'static' functions * bugfix after changing ptr + step to .ptr(y,x) calls by adjusting ROI of prevImage, currImage and derivI as well as changing the offset of the points in the invoker classes. * add some static_cast to avoid warning * remove 50 grid size sample from perf test. This grid size is to sparse for the epic interpolation * remove notSameColor function since it is not used anymore