[ITK-users] VNL matrix with the Python wrapper

[Dženan Zukić]

Hi Guillaume,

we have switched to discourse <https://discourse.itk.org/> forum for
discussion. Can you repost your question there?

Thanks,
Dženan

On Sun, Feb 25, 2018 at 10:26 AM, Guillaume Lemaître <g.lemaitre58 at gmail.com
> wrote:

> Hi All,
>
> I am using the python wrapper of itk to manipulate. I checked the quick
> start guide (http://itkpythonpackage.readthedocs.io/en/latest/
> Quick_start_guide.html#usage) to go from numpy to vnl matrices and
> vice-versa. However, I got into trouble when trying to use those utils with
> itk images. As a short example:
>
> ```python
> >>> import numpy as np
>
> >>> img = np.random.random((100, 100, 100))
> >>> img_itk = itk.GetImageFromArray(img)
>
> >>> vnl_matrix = img_itk.GetDirection().GetVnlMatrix()
> >>> type(vnl_matrix)
> vnl_matrix_fixedPython.vnl_matrix_fixedD_3_3
>
> >>> itk.GetArrayFromVnlMatrix(vnl_matrix)
>
> TypeError: in method 'itkPyVnlD__GetArrayViewFromVnlMatrix', argument 1
> of type 'vnl_matrixD *'
> ```
>
> So what would the proper way of converting this matrix into a numpy array
> or view.
>
> Cheers,
> --
> Guillaume Lemaitre
> INRIA Saclay - Parietal team
> Center for Data Science Paris-Saclay
> https://glemaitre.github.io/
>
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