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remap: how to find the (x,y) in dst given (u,v) in src?

remap function can give you the point (u,v) in the src image when you have point (x,y) in dst image through the map1 and map2 mapping function. I do not know if I have the input (u,v) in the src image, how can I get the corresponding point (x,y) in the dst image??