[Octave-bug-tracker] [bug #61845] [octave forge] (image) speed of imrotate with bicubic interpolation increased

[Hartmut]

Follow-up Comment #5, bug #61845 (project octave):

I have tested the suggested patch in comment #4 a bit. Results:

* I also see a (small, less then 10%) speed increase for very big images.
Similar to the test code in comment #4, just less of speed increase on my
linux laptop.

* I do like the idea of only casting to "single" for the less accurate integer
types like uint8. This mainly saves memory. I would even argue to use this
patch and to push it to the repo.

* But in the original matter, the decreased speed when rotating images with
bicubic interpolation, the botton line does unfortunally not change. With this
patch applied, I still see a execution time that is roughly doubled when going
from image-2.12 to the current bicubic_conv to be included in image-2.14.

@Christof: Do you have a good idea, how to speed up your new convolution
method in the bicubic interpolation of imremap.m? Or is this doubleing in
execution time the price we have to pay for the now better Matlab
compatibility?

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