I'm shocked. I don't even know this is a thing.

By that I mean, I know what bilinear/bicubic/lanczos resizing algorithms are, and I know they should at least have acceptable results (compared to NN).

But I don't know famous libraries (especially OpenCV which is a computer vision library!) could have such poor results.

Also a side note, IIRC bilinear and bicubic have constants in the equation. So technically when you're comparing different implementations you need to make sure this input (parameters) is the same. But this shouldn't excuse the extreme poor results in some.