SimpleITK.ImageFileWriter in Python has no method "SetImageIO" but C++ docs say it has

Question

I'm using SimpleITK for Python and have created an empty image using NumPy as follows:

import SimpleITK as sitk
import numpy as np

pixels = np.zeros((64, 64))
image = sitk.GetImageFromArray(pixels)

Then, when I try to write the image to file in NIFTI format it complains that it cannot find the method "SetImageIO" on the ImageFileWriter object.

write = sitk.ImageFileWriter()
write.SetFileName('hello.nii.gz')
write.SetImageIO('NiftiImageIO')
write.Execute(image)

Error:

AttributeError: 'ImageFileWriter' object has no attribute 'SetImageIO'

Does anybody know why this is? The C++ docs clearly mention a method "SetImageIO" for ImageFileWriter.

Thanks, Ralph

What version of SimpleITK do you have installed? This was a new feature with 1.2. — blowekamp, Apr 24 '19 at 10:46
Good reminder, thnx. I have version 1.1.0. That probably explains the issue :) — Ralph, Apr 24 '19 at 10:47
I copied my request for more information to an answer, so that we can have an proper answer for the question. — blowekamp, Apr 24 '19 at 14:30

score 3 · Answer 1 · answered Apr 24 '19 at 14:29

3

What version of SimpleITK do you have installed?

This is a new feature with 1.2, so if you have an older version the method will not be available.

answered Apr 24 '19 at 14:29

blowekamp

1,401
7
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I was using version 1.1.0 so that was indeed the issue. – Ralph Apr 25 '19 at 12:57

score 2 · Accepted Answer · answered May 25 '19 at 23:26

The SimpleITK documentation is sorely lacking, and not all C++ library functions are available in the python package, which complicates a few more things.

However,

sitk.WriteImage(image, "hello.nii.gz")

Will automatically infer the filetype from the string.

SimpleITK.ImageFileWriter in Python has no method "SetImageIO" but C++ docs say it has

2 Answers2