X-Git-Url: https://git.creatis.insa-lyon.fr/pubgit/?a=blobdiff_plain;f=itk%2FclitkResampleImageWithOptionsFilter.txx;h=ddaa8a077b41f2ffcf2456836c2eeb7a4f0119fc;hb=299afce0c4c4cc3524dccecf4ecffd46d7a66328;hp=0807fc0f09418f68423f669570b8fda2b1541865;hpb=9a4f7a1a65fcaa160878e50a12a61bdacf78607a;p=clitk.git

diff --git a/itk/clitkResampleImageWithOptionsFilter.txx b/itk/clitkResampleImageWithOptionsFilter.txx
index 0807fc0..ddaa8a0 100644
--- a/itk/clitkResampleImageWithOptionsFilter.txx
+++ b/itk/clitkResampleImageWithOptionsFilter.txx
@@ -3,7 +3,7 @@
 
   Authors belong to:
   - University of LYON              http://www.universite-lyon.fr/
-  - Léon Bérard cancer center       http://oncora1.lyon.fnclcc.fr
+  - Léon Bérard cancer center       http://www.centreleonberard.fr
   - CREATIS CNRS laboratory         http://www.creatis.insa-lyon.fr
 
   This software is distributed WITHOUT ANY WARRANTY; without even
@@ -14,7 +14,7 @@
 
   - BSD        See included LICENSE.txt file
   - CeCILL-B   http://www.cecill.info/licences/Licence_CeCILL-B_V1-en.html
-  ======================================================================-====*/
+  ===========================================================================**/
 
 // clitk
 #include "clitkDD.h"
@@ -122,13 +122,20 @@ GenerateOutputInformation()
   if (m_OutputIsoSpacing != -1) { // apply isoSpacing
     for(unsigned int i=0; i<dim; i++) {
       m_OutputSpacing[i] = m_OutputIsoSpacing;
-      // I use ceil to be sure not to miss a slice
-      m_OutputSize[i] = (int)ceil(inputSize[i]*inputSpacing[i]/m_OutputSpacing[i]);
+      // floor() is used to intentionally reduce the number of slices 
+      // because, from a clinical point of view, it's better to 
+      // remove data than to add data that privously didn't exist.
+      if(inputSpacing[i]*m_OutputSpacing[i]<0)
+        itkExceptionMacro( << "Input and output spacings don't have the same signs, can't cope with that" );
+      m_OutputSize[i] = (int)floor(inputSize[i]*inputSpacing[i]/m_OutputSpacing[i]);
     }
   } else {
     if (m_OutputSpacing[0] != -1) { // apply spacing, compute size
       for(unsigned int i=0; i<dim; i++) {
-        m_OutputSize[i] = (int)ceil(inputSize[i]*inputSpacing[i]/m_OutputSpacing[i]);
+        if(inputSpacing[i]*m_OutputSpacing[i]<0)
+          itkExceptionMacro( << "Input and output spacings don't have the same signs, can't cope with that" );
+	// see comment above for the use of floor()
+	m_OutputSize[i] = (int)floor(inputSize[i]*inputSpacing[i]/m_OutputSpacing[i]);
       }
     } else {
       if (m_OutputSize[0] != 0) { // apply size, compute spacing
@@ -148,7 +155,7 @@ GenerateOutputInformation()
     m_OutputSize[l] = inputSize[l];
     m_OutputSpacing[l] = inputSpacing[l];
   }
-    
+
   // Set Size/Spacing
   OutputImagePointer outputImage = this->GetOutput(0);
   // OutputImageRegionType region;
@@ -157,7 +164,6 @@ GenerateOutputInformation()
   outputImage->CopyInformation(input);
   outputImage->SetLargestPossibleRegion(m_OutputRegion);
   outputImage->SetSpacing(m_OutputSpacing);
-  outputImage->FillBuffer(GetDefaultPixelValue());
 
   // Init Gaussian sigma
   if (m_GaussianSigma[0] != -1) { // Gaussian filter set by user
@@ -216,12 +222,19 @@ GenerateData()
     std::cout << "LastDimIsTime  = " << m_LastDimensionIsTime << std::endl;
   }
 
+  // Compute origin based on image corner
+  typename FilterType::OriginPointType origin = input->GetOrigin();
+  for(unsigned int i=0; i<OutputImageType::ImageDimension; i++) {
+    origin[i] -= 0.5 * input->GetSpacing()[i];
+    origin[i] += 0.5 * m_OutputSpacing[i];
+  }
+
   // Instance of the transform object to be passed to the resample
   // filter. By default, identity transform is applied
   filter->SetTransform(m_Transform);
   filter->SetSize(m_OutputSize);
   filter->SetOutputSpacing(m_OutputSpacing);
-  filter->SetOutputOrigin(input->GetOrigin());
+  filter->SetOutputOrigin(origin);
   filter->SetDefaultPixelValue(m_DefaultPixelValue);
   filter->SetNumberOfThreads(this->GetNumberOfThreads()); 
   filter->SetOutputDirection(input->GetDirection()); // <-- NEEDED if we want to keep orientation (in case of PermutAxes for example)