[ITK] [ITK-users] Python wrapping issue

[Matt McCormick]

Hi Paolo,

Lassi has some good suggestions. Some additional information:

If you use ITK Git master [1], the Python wrapping builds in half the
time as ITK 4.8.

To create a histogram matching filter, the preferred syntax is:

  import itk
  Dimension = 3
  PixelType = itk.F
  ImageType = itk.Image[PixelType, Dimension]
  histogramMatching = itk.HistogramMatchingImageFilter[ImageType,
ImageType].New()

Hope this helps,
Matt

[1] http://www.itk.org/Wiki/ITK/Git

On Wed, Oct 14, 2015 at 5:27 AM, Paavolainen, Lassi
<lassi.paavolainen at jyu.fi> wrote:
> Hi Paolo,
>
> Why you want to import itkImagePython instead of just itk?
>
> import itk
> img = itk.Image.F3.New()
>
> should work as previously. Notice that
> itk.HistogramMatchingImageFilter()
> would not work in any case since you need to define the types as well.
>
> The modular design of ITK 4 should not have effected the interface of ITK
> Python wrappings in anyway. If I'm wrong then maybe someone can correct me.
>
> So I would first check that you are able to import itk and load some filter.
> If not, then check that all shared libs are in search path.
>
> Cheers,
> Lassi
>
> ________________________________
> From: Insight-users [insight-users-bounces at itk.org] on behalf of Paolo
> Zaffino [p.zaffino at yahoo.it]
> Sent: Wednesday, October 14, 2015 11:51
> To: insight-users at itk.org
> Subject: [ITK-users] Python wrapping issue
>
> Dear ITK community,
> I compiled ITK 4.8 into an Ubuntu 14.04 machine enabling also the python
> wrapping.
> Compiling the code took really a while and I had to restart the make phase
> more than one time since it crashed without any apparently reason.
> Finally when the make step was over I executed the make install command.
>
> If I open ipython and I type "import itkImagePython" it returns
>
> ---------------------------------------------------------------------------
> ImportError                               Traceback (most recent call last)
> <ipython-input-1-dfd82b0a3e37> in <module>()
> ----> 1 import itkImagePython
>
> /usr/local/lib/ITK-4.8/Python/itkImagePython.py in <module>()
>      30                 fp.close()
>      31             return _mod
> ---> 32     _itkImagePython = swig_import_helper()
>      33     del swig_import_helper
>      34 else:
>
> /usr/local/lib/ITK-4.8/Python/itkImagePython.py in swig_import_helper()
>      22             fp, pathname, description =
> imp.find_module('_itkImagePython', [dirname(__file__)])
>      23         except ImportError:
> ---> 24             import _itkImagePython
>      25             return _itkImagePython
>      26         if fp is not None:
>
> ImportError: No module named _itkImagePython
>
> but if I run "import ITKRegionGrowingPython" it works.
> In addition, after importing ITKRegionGrowingPython also itkImagePython
> works!
>
> I think the path is correctly set, since I see
> /usr/local/lib/ITK-4.8/Python.
> I also noted that in the "compiledFolder/lib" I see:
>
> ITKRegionGrowingPython.py and _ITKRegionGrowingPython.so
> itkImagePython.py but NOT _itkImagePython.so
>
>
> Do you have any idea?
>
> Furthermore, is it the syntax itk.something still valid or it has been
> replaced by separate submodules?
> Because if I run
> hm=itk.HistogramMatchingImageFilter()
> I get
> UnboundLocalError: local variable 'module' referenced before assignment
>
> Thank you very much.
> Regards.
>
> Paolo
>
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