[ITK Community] [Insight-developers] LabelOverlapImageFilter Assert issue

[Bradley Lowekamp]

Nick,

I am trying to add LabelOverlapImageFilter to SimpleITK. It's failing one of my test in SimpleITK. At this is the section:

  itk::simple::Image smallImage( 1,1,1,itk::simple::sitkUInt8 );
  itk::simple::Image largeImage( 10,10,10,itk::simple::sitkUInt8 );
  itk::simple::Image smallShortImage( 1,1,1,itk::simple::sitkUInt16 );
  try
    {
    // Try executing with different size images.
    // This will either work or throw an exception, either is OK. So
    // this is here just to make sure that the behavior does not cause
    // undefined behavior such as segfault, or other errouneos behavior.
    filter.Execute ( largeImage, smallImage );
    } catch (... )
    { }

http://open.cdash.org/testDetails.php?test=240179118&build=3246420

This is causing a miss-matched region assert to fail in the iterator:
https://github.com/InsightSoftwareConsortium/ITK/blob/master/Modules/Core/Common/include/itkImageConstIterator.h#L208

During the construction of the iterator here:
https://github.com/InsightSoftwareConsortium/ITK/blob/master/Modules/Filtering/ImageStatistics/include/itkLabelOverlapMeasuresImageFilter.hxx#L142

There is also a non-standard GenerateInputRequestedRegion:
https://github.com/InsightSoftwareConsortium/ITK/blob/master/Modules/Filtering/ImageStatistics/include/itkLabelOverlapMeasuresImageFilter.hxx#L39

The normal implementation of this method requests all inputs to have the same ImageRegion. This normally then triggers exceptions with the requested region not able to be generated from the pipeline.

I don't immediately see the reason why the GenerateInputRequestedRegion was overridden, the default should work ok. Do you know why?

Thanks,
Brad
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