X-Git-Url: https://git.creatis.insa-lyon.fr/pubgit/?a=blobdiff_plain;f=itk%2FclitkResampleImageWithOptionsFilter.txx;h=1bf5448782819792a906d03aafa0268e3e055a54;hb=1361e8457bdc0d189ab0d44530a20cc2d5e04393;hp=0807fc0f09418f68423f669570b8fda2b1541865;hpb=9a4f7a1a65fcaa160878e50a12a61bdacf78607a;p=clitk.git

diff --git a/itk/clitkResampleImageWithOptionsFilter.txx b/itk/clitkResampleImageWithOptionsFilter.txx
index 0807fc0..1bf5448 100644
--- a/itk/clitkResampleImageWithOptionsFilter.txx
+++ b/itk/clitkResampleImageWithOptionsFilter.txx
@@ -122,13 +122,16 @@ 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.
+      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]);
+	// 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
@@ -157,7 +160,6 @@ 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