[Octave-bug-tracker] [bug #30587] buggy implementation of bicubic interpolation in interp2/bicubic

[Marco Caliari]

Follow-up Comment #1, bug #30587 (project octave):

Dear Thorsten,

the bicubic.m interpolation is "better". It corresponds to 

R. Keys, (1981). "Cubic convolution interpolation for digital image
processing". IEEE Transactions on Signal Processing, Acoustics, Speech, and
Signal Processing 29

In principle, I can fix the implementation inside interp2.m in order to match
the implementation in bicubic.m (I can do for sure if x and y are both
uniformly spaced vectors). First, there is something else to fix: if xi and yi
are vectors of the same length and orientation (scattered data), then the
algorithm inside interp2.m should be used. I don't understand your input: why
should you give the points xi and yi as matrices not coming from a meshgrid?

Marco

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