BUG: Address bug with small size in output of SliceImageFilter

The size of the output with a non-one step was being floored, instead include an extra index if available. For example for a size of 5 and a step of two the filter will now produce a size of 3. Closes #1177.
InsightSoftwareConsortium · Aug 23, 2019 · 7aac4a6 · 7aac4a6
1 parent 432dd1b
commit 7aac4a6
Showing 1 changed file with 2 additions and 1 deletion.
diff --git a/Modules/Filtering/ImageGrid/include/itkSliceImageFilter.hxx b/Modules/Filtering/ImageGrid/include/itkSliceImageFilter.hxx
@@ -284,7 +284,8 @@ SliceImageFilter< TInputImage, TOutputImage >
     if ( (m_Step[i] > 0 && stop > start) ||
          ( m_Step[i] < 0 && stop < start ) )
       {
-      outputSize[i] = (stop-start)/m_Step[i];
+      outputSize[i] = (stop-start-Math::sgn(m_Step[i]))/m_Step[i];
+      outputSize[i] += 1u;
       }
     else
       {