From 9cecbdfc5697a0f338b30b6ad1e5ff1bdd283254 Mon Sep 17 00:00:00 2001
From: Niels Dekker <N.Dekker@lumc.nl>
Date: Mon, 23 Mar 2026 22:17:46 +0100
Subject: [PATCH 1/2] PERF: Call `m_LabelStatusImage->FillBuffer(1)` in
 MRFImageFilter

Replaced a buffered region iteration with the equivalent (but more efficient)
`FillBuffer` call, in `MRFImageFilter::Allocate()`.

Follow-up to pull request https://github.com/InsightSoftwareConsortium/ITK/pull/5970
"Replace buffered region iteration with FillBuffer in FastMarching filters"
---
 .../include/itkMRFImageFilter.hxx                         | 8 +-------
 1 file changed, 1 insertion(+), 7 deletions(-)

diff --git a/Modules/Segmentation/MarkovRandomFieldsClassifiers/include/itkMRFImageFilter.hxx b/Modules/Segmentation/MarkovRandomFieldsClassifiers/include/itkMRFImageFilter.hxx
index ebf93263c46..d83642e1a2d 100644
--- a/Modules/Segmentation/MarkovRandomFieldsClassifiers/include/itkMRFImageFilter.hxx
+++ b/Modules/Segmentation/MarkovRandomFieldsClassifiers/include/itkMRFImageFilter.hxx
@@ -346,14 +346,8 @@ MRFImageFilter<TInputImage, TClassifiedImage>::Allocate()
   m_LabelStatusImage->SetBufferedRegion(region);
   m_LabelStatusImage->Allocate();
 
-  LabelStatusImageIterator rIter(m_LabelStatusImage, m_LabelStatusImage->GetBufferedRegion());
-
   // Initialize the label status image to 1
-  while (!rIter.IsAtEnd())
-  {
-    rIter.Set(1);
-    ++rIter;
-  }
+  m_LabelStatusImage->FillBuffer(1);
 }
 
 template <typename TInputImage, typename TClassifiedImage>

From e0ccde0da3b87d999aec0964eb9da50443fb97d0 Mon Sep 17 00:00:00 2001
From: Niels Dekker <N.Dekker@lumc.nl>
Date: Mon, 23 Mar 2026 22:28:09 +0100
Subject: [PATCH 2/2] STYLE: Remove `labelledImageIt` from
 `RGBGibbsPriorFilter::GibbsEnergy`

This particular member function never used its local `labelledImageIt` variable.
---
 .../include/itkRGBGibbsPriorFilter.hxx                          | 2 --
 1 file changed, 2 deletions(-)

diff --git a/Modules/Segmentation/MarkovRandomFieldsClassifiers/include/itkRGBGibbsPriorFilter.hxx b/Modules/Segmentation/MarkovRandomFieldsClassifiers/include/itkRGBGibbsPriorFilter.hxx
index 567ba0eaca7..5506832f592 100644
--- a/Modules/Segmentation/MarkovRandomFieldsClassifiers/include/itkRGBGibbsPriorFilter.hxx
+++ b/Modules/Segmentation/MarkovRandomFieldsClassifiers/include/itkRGBGibbsPriorFilter.hxx
@@ -288,8 +288,6 @@ template <typename TInputImage, typename TClassifiedImage>
 double
 RGBGibbsPriorFilter<TInputImage, TClassifiedImage>::GibbsEnergy(unsigned int i, unsigned int k, unsigned int k1)
 {
-  LabelledImageRegionIterator labelledImageIt(m_LabelledImage, m_LabelledImage->GetBufferedRegion());
-
   LabelType    f[8];
   unsigned int neighborcount = 0;
   int          simnum = 0;