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OpenCV optical flow implementations evaluation on KITTI 2015 benchmark

I am trying to evaluate cuda based dual tv-l1 dense optical flow algorithm on kitti 2015 training set and observed that the quality is much less than the actual dual tv-l1 implementation (

I am trying to tune the parameters according to the actual dual tv-l1 implementation but not getting any quality gains. What are the good parameter values for dual tv-l1 OpenCv implemenation?

I am also seeing the quality of cuda pyramidal LK is is better compared to the cuda farneback and which are inturn better than cuda dual tv-l1 of OpenCV. Any clues about the parameters.