### Eclipse Workspace Patch 1.0
#P ITK_3_4_0
Index: Code/BasicFilters/itkShrinkImageFilter.txx
===================================================================
RCS file: /cvsroot/Insight/Insight/Code/BasicFilters/itkShrinkImageFilter.txx,v
retrieving revision 1.53
diff -u -r1.53 itkShrinkImageFilter.txx
--- Code/BasicFilters/itkShrinkImageFilter.txx	19 Mar 2006 04:36:56 -0000	1.53
+++ Code/BasicFilters/itkShrinkImageFilter.txx	16 May 2008 15:17:27 -0000
@@ -3,7 +3,7 @@
   Program:   Insight Segmentation & Registration Toolkit
   Module:    $RCSfile: itkShrinkImageFilter.txx,v $
   Language:  C++
-  Date:      $Date: 2006-03-19 04:36:56 $
+  Date:      $Date: 2006/03/19 04:36:56 $
   Version:   $Revision: 1.53 $
 
   Copyright (c) Insight Software Consortium. All rights reserved.
@@ -204,11 +204,20 @@
   typename TInputImage::IndexType inputRequestedRegionStartIndex;
   
   for (i = 0; i < TInputImage::ImageDimension; i++)
-    {
-    inputRequestedRegionSize[i]
-      = outputRequestedRegionSize[i] * m_ShrinkFactors[i];
+    {    
     inputRequestedRegionStartIndex[i]
-      = outputRequestedRegionStartIndex[i] * (long)m_ShrinkFactors[i];
+      = outputRequestedRegionStartIndex[i] * (size_t)m_ShrinkFactors[i];
+    
+    // To optimize computation time and specially memory footprint
+    if (outputRequestedRegionSize[i] == 1) 
+      {
+      inputRequestedRegionSize[i] = 1;        
+      }
+    else 
+      {
+      inputRequestedRegionSize[i]
+         = outputRequestedRegionSize[i] * (size_t)m_ShrinkFactors[i];
+      }
     }
   
   typename TInputImage::RegionType inputRequestedRegion;
@@ -228,8 +237,12 @@
   // call the superclass' implementation of this method
   Superclass::EnlargeOutputRequestedRegion(output);
   
-  // generate everything in the region of interest
-  output->SetRequestedRegionToLargestPossibleRegion();
+  // Why setting requested region to largest possible region??
+  // Input requested region is calculated in GenerateInputRequestedRegion ()
+  // according to output requested region. Setting the output to the 
+  // largest possible region will set the input requested region to the
+  // input largest possible region and it is not what we want!?
+  // output->SetRequestedRegionToLargestPossibleRegion();
 }