[ITK-users] ITK Python: numpy to itk image (and viceversa)

[D'Isidoro Fabio]

Hallo,

I use ITK with Python Wrap. I need to interface my Python code with a Cython-wrapped C++ code that takes only numpy array as input and returns numpy array as output.

Hence, I need to convert the Python itk images into numpy array to be given as input to the wrapped C++ code, and then convert the numpy array in output from the wrapped C++ code back into python itk images.

Question 1) How can I do that in an efficient way? I found some posts on itk.PyBuffer but I could not find anywhere any reference on how to install it on my itk wrap build.

Question 2) The purpose of writing a part of my algorithm in C++ is to speed up the code. If the conversion between python itk images and numpy arrays is slow, I would lose all the speed gain obtained with the C++ implementation. Are there better ways to deal with that?

Thank you,

Fabio.

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