[Insight-developers] MattesMutualInformation failures in ITK4

[Williams, Norman K]

We have an application for Image Registration, BRAINSFit (http://www.nitrc.org/projects/multimodereg/) that is used at Iowa for our standard workup, and is also distributed with Slicer.



As part of the Slicer effort and our ongoing work on ITK4 we have begun testing BRAINSFit built with ITKV4.  Hans Johnson asked me to look into the testing failures with ITKV4.



What I've discovered is that most of the failures come down to this an exception with the error message  "Joint PDF summed to zero" -- entire message reproduced below.



Now, I'm a software process guy more than an image processing guy, and I don't pretend to understand very much about Image Registration algorithms or the Mattes method in particular, so I'm asking for a little help on this one. It doesn't seem right that code that produces useful results in ITK3 should fail catastrophically in ITK4.



Any ideas?



itk::ExceptionObject (0x102811a70)
Location: "void itk::MattesMutualInformationImageToImageMetric<TFixedImage, TMovingImage>::GetValueAndDerivative(const typename itk::ImageToImageMetric<TFixedImage, TMovingImage\
>::ParametersType&, typename itk::ImageToImageMetric<TFixedImage, TMovingImage>::MeasureType&, typename itk::ImageToImageMetric<TFixedImage, TMovingImage>::DerivativeType&) cons\
t [with TFixedImage = itk::Image<float, 3u>, TMovingImage = itk::Image<float, 3u>]"
File: /scratch/kent/itktest/ITK/Code/Algorithms/itkMattesMutualInformationImageToImageMetric.txx
Line: 1030
Description: itk::ERROR: MattesMutualInformationImageToImageMetric(0x101ccb990): Joint PDF summed to zero


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