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answered 2018-10-23 20:40:20 -0600
Github's search is pretty terrible. It's in imgproc/smooth.cpp, line 4085.
https://github.com/opencv/opencv/blob/9c23f2f1a682faa9f0b2c2223a857c7d93ba65a6/modules/imgproc/src/smooth.cpp#L4085
