I don't think that's the effect you were looking for. I have taken a look at
your code, and if I understand correctly, you are making interpolation pixel
per pixel, but with cubic interpolation you need 4 pixels, so if you are
repeating it on the next pixel, you are overlapping the previous
interplation. I've never tried it, but I think you should skip to the next
block of 4*4 pixels (or maybe 3*3, considering continuity/differentiability
of the block's edges).

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