[Insight-users] questions about the mutualinformationHistogramImageToImageMetric

[Luis Ibanez]

Hi Lanlanny,


Please look at the example program:

      Insight/Examples/Registration/
                          ImageRegistration14.cxx


It registers two images of different modality using the

   itkNormalizedMutualInformationHistogramImageToImageMetric



The Metric *does* consider only the overlap region between the
Fixed image and the transformed Moving image.  

You can easily verify this by looking a the file

                            Insight/Code/Algorithms/
itkNormalizedMutualInformationHistogramImageToImageMetric.txx

in particular to lines 69 to 102.

This use of the overlap region is, by the way, something that *all* the
ITK Image Metrics do.

Notice that in addition to that you can use the optional FixedImageMask
and MovingImageMask in order to further restrict the region that
contributes to the computation of the metric.




For examples on the use of the RegularGradientDescentOptimizer
please look at the following files:


   Insight/Examples/Registration/
                     ImageRegistration1.cxx
                     ImageRegistration12.cxx
                     ImageRegistration13.cxx
                     ImageRegistration2.cxx
                     ImageRegistration3.cxx
                     ImageRegistration3.py
                     ImageRegistration3.tcl
                     ImageRegistration4.cxx
                     ImageRegistration4.py
                     ImageRegistration4.tcl
                     ImageRegistration5.cxx
                     ImageRegistration5.py
                     ImageRegistration5.tcl
                     ImageRegistration6.cxx
                     ImageRegistration7.cxx
                     ImageRegistration9.cxx
                     MultiResImageRegistration1.cxx
                     MultiResImageRegistration2.cxx



and, of course, we *strongly* encourage you to read the Chapter on
Image Registration from the ITK Software Guide


          http://www.itk.org/ItkSoftwareGuide.pdf




Please let us know if you have any further questions,



     Thanks


         Luis


===================
Ñî´ºÀ¼ wrote:

>when I use the histogramImageToImageMetric, for example, the
>itkMutualInformationHistogramImageToImageMetric , 
>how should the parameters be assigned? particularly, the
>metric->SetDerivativeStepLengthScales();and I want to konw 
>whether the file *.txx considers that the overlap region is also changed with the
>changing transform parameters?
>another question: how to assign the parameters of the optimizer such as
>regularGradientDescentOptimizer and so on?
>Thanks a lot!
>
>
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