[ITK-users] SpatialOrientationAdapter

[Budin, Francois]

Thank you Bill. Let me know if you find anything.

Francois
On May 22, 2015, at 4:43 PM, Bill Lorensen <bill.lorensen at gmail.com<mailto:bill.lorensen at gmail.com>> wrote:


It is possible that the adaptor uses a different notation. I'll have to check.

On May 22, 2015 3:59 PM, "Francois Budin" <fbudin at email.unc.edu<mailto:fbudin at email.unc.edu>> wrote:
Hello Everybody,

I was trying to use itk::SpatialOrientationAdapter. As a simple example, I wrote the following code:

#include <iostream>
#include <itkSpatialOrientationAdapter.h>
#include <itkMatrix.h>
#include <itkImage.h>

int main( int argc, char* argv[] )
{
  typedef itk::Image< float , 3 > ImageType ;
  typedef ImageType::DirectionType DirectionType ;
  DirectionType direction ;
  direction.SetIdentity() ;
  typedef itk::SpatialOrientation::ValidCoordinateOrientationFlags CoordinateOrientationCode ;
  CoordinateOrientationCode orientation ;
  orientation = itk::SpatialOrientationAdapter().FromDirectionCosines( direction ) ;
  if( orientation == itk::SpatialOrientation::ITK_COORDINATE_ORIENTATION_LPS )
  {
     std::cout <<  "LPS" << std::endl ;
  }
  else if( orientation == itk::SpatialOrientation::ITK_COORDINATE_ORIENTATION_RAI )
  {
     std::cout <<  "RAI" << std::endl ;
  }
  else
  {
     std::cout <<  "Unknown" << std::endl ;
  }
  return 0 ;
}

I wanted to make sure that since ITK is using LPS as its default orientation, if I were to give the identity matrix as an orientation matrix to itk::SpatialOrientationAdapter().FromDirectionCosines, I would obtain LPS as a result. However, I obtain RAI which is exactly the opposite of what I was expecting. Could somebody help me to understand what is happening and why I don't get LPS as a result?
Thank you,

Francois
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