[Insight-developers] mutual information image to image metric > > Re: [Insight-developers] mutual information image to image metric

[Luis Ibanez]

Hi,

This should be fixed now:

The ImageRegistrationMethod is now by default 
passing the BufferedRegion of the FixedImage
as the "FixedImageRegion" to be used by the
metric.

Before, the registration method was relying on
the user to provide region of the fixed image
over which the metric will be computed.

When this region is not defined, the Initialize()
method of the ImageToImageMetric throws an
exception. (which is what was showing up in 
Josh's report).

Users can still set the FixedImageRegion but
now that should be done at the level of the
ImageRegistrationMethod instead of the Metric.



Luis



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Joshua Cates wrote
> Registration folks,
> 
> I'm getting a new run-time exception in previously working code while
> using MutualInformationImageToImageMetric in 
> ImageRegistrationMethod with
> GradientDescentOptimizer:
> 
> itk::ExceptionObject (0x81645a0)
> Location: "Unknown"
> File:
> /home/sci/cates/itk/Insight/Code/Algorithms/itkImageToImageMetric.txx
> Line: 91
> Description: itk::ERROR: 
> MutualInformationImageToImageMetric(0x81644c8):
> FixedImageRegion is empty
> 
> 
> Can't this ivar (metric::FixedImageRegion) be set by
> ImageRegistrationMethod like it is in
> MultiResolutionImageRegistrationMethod, or must the user now set it
> explicitly?
> 
> Thanks,
> 
> Josh.
> 
> 
> 
> 
> 
>