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How to opencv implemented KLT on GPU ?


I wrote a program for track vehicles features. I used "SparsePyrLKOpticalFlow" for track features using KLT algorithm on GPU. Now I am writing a paper about it, but I do not know how "SparsePyrLKOpticalFlow" works on GPU. I need a block diagram or flowchart that how work "SparsePyrLKOpticalFlow" on GPU.

thank you