diff --git a/modules/AbsoluteFrameDifference.cpp b/modules/AbsoluteFrameDifference.cpp
new file mode 100644
index 0000000..44b4eeb
--- /dev/null
+++ b/modules/AbsoluteFrameDifference.cpp
@@ -0,0 +1,77 @@
+/*    This file is a part of plaYUVer project
+ *    Copyright (C) 2014  by Luis Lucas      (luisfrlucas@gmail.com)
+ *                           Joao Carreira   (jfmcarreira@gmail.com)
+ *
+ *    This program is free software; you can redistribute it and/or modify
+ *    it under the terms of the GNU General Public License as published by
+ *    the Free Software Foundation; either version 2 of the License, or
+ *    (at your option) any later version.
+ *
+ *    This program is distributed in the hope that it will be useful,
+ *    but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *    GNU General Public License for more details.
+ *
+ *   You should have received a copy of the GNU General Public License along
+ *   with this program; if not, write to the Free Software Foundation, Inc.,
+ *   51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+
+/**
+ * \file     AbsoluteFrameDifference.cpp
+ * \brief    Absolute Frame Difference module
+ */
+
+#include "AbsoluteFrameDifference.h"
+
+namespace plaYUVer
+{
+
+static PlaYUVerModuleDefinition AbsoluteFrameDifferenceDef =
+{
+    FRAME_PROCESSING_MODULE,
+    "Measurements",
+    "AbsoluteFrameDifference",
+    "Measure the absolute difference between two images (Y plane), e. g., abs( Y1 - Y2 )",
+    MODULE_REQUIRES_TWO_FRAMES,
+    MODULE_REQUIRES_NEW_WINDOW,
+    APPLY_WHILE_PLAYING,
+};
+
+AbsoluteFrameDifference::AbsoluteFrameDifference()
+{
+  m_pcFrameDifference = NULL;
+  setModuleDefinition( AbsoluteFrameDifferenceDef );
+}
+
+Void AbsoluteFrameDifference::create( PlaYUVerFrame* Input )
+{
+  m_pcFrameDifference = new PlaYUVerFrame( Input->getWidth(), Input->getHeight(), PlaYUVerFrame::GRAY );
+}
+
+PlaYUVerFrame* AbsoluteFrameDifference::process( PlaYUVerFrame* Input1, PlaYUVerFrame* Input2 )
+{
+  Pel* pInput1PelYUV = Input1->getPelBufferYUV()[0][0];
+  Pel* pInput2PelYUV = Input2->getPelBufferYUV()[0][0];
+  Pel* pOutputPelYUV = m_pcFrameDifference->getPelBufferYUV()[0][0];
+  Int aux_pel_1, aux_pel_2;
+
+  for( UInt y = 0; y < m_pcFrameDifference->getHeight(); y++ )
+    for( UInt x = 0; x < m_pcFrameDifference->getWidth(); x++ )
+    {
+      aux_pel_1 = *pInput1PelYUV++;
+      aux_pel_2 = *pInput2PelYUV++;
+      *pOutputPelYUV++ = abs( aux_pel_1 - aux_pel_2 );
+    }
+  return m_pcFrameDifference;
+}
+
+Void AbsoluteFrameDifference::destroy()
+{
+  if( m_pcFrameDifference )
+    delete m_pcFrameDifference;
+  m_pcFrameDifference = NULL;
+}
+
+}  // NAMESPACE
+
diff --git a/modules/AbsoluteFrameDifference.h b/modules/AbsoluteFrameDifference.h
new file mode 100644
index 0000000..4360790
--- /dev/null
+++ b/modules/AbsoluteFrameDifference.h
@@ -0,0 +1,54 @@
+/*    This file is a part of plaYUVer project
+ *    Copyright (C) 2014  by Luis Lucas      (luisfrlucas@gmail.com)
+ *                           Joao Carreira   (jfmcarreira@gmail.com)
+ *
+ *    This program is free software; you can redistribute it and/or modify
+ *    it under the terms of the GNU General Public License as published by
+ *    the Free Software Foundation; either version 2 of the License, or
+ *    (at your option) any later version.
+ *
+ *    This program is distributed in the hope that it will be useful,
+ *    but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *    GNU General Public License for more details.
+ *
+ *   You should have received a copy of the GNU General Public License along
+ *   with this program; if not, write to the Free Software Foundation, Inc.,
+ *   51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+
+/**
+ * \file     AbsoluteFrameDifference.h
+ * \brief    Absolute Frame Difference module
+ */
+
+#ifndef __ABSOLUTEFRAMEDIFFERENCE_H__
+#define __ABSOLUTEFRAMEDIFFERENCE_H__
+
+#include "PlaYUVerModuleIf.h"
+
+#include <cassert>
+
+namespace plaYUVer
+{
+
+class AbsoluteFrameDifference: public PlaYUVerModuleIf
+{
+private:
+  PlaYUVerFrame* m_pcFrameDifference;
+
+public:
+  AbsoluteFrameDifference();
+  virtual ~AbsoluteFrameDifference()
+  {
+  }
+  Void create( PlaYUVerFrame* Input );
+  PlaYUVerFrame* process( PlaYUVerFrame* Input1, PlaYUVerFrame* Input2 );
+  Void destroy();
+
+};
+
+}  // NAMESPACE
+
+#endif // __FRAMEDIFFERENCE_H__
+
diff --git a/modules/CMakeLists.txt b/modules/CMakeLists.txt
index 4f8b6fb..6e37592 100644
--- a/modules/CMakeLists.txt
+++ b/modules/CMakeLists.txt
@@ -39,6 +39,7 @@ ADD_MODULE( FilterComponentLuma "FilterComponent" )
 ADD_MODULE( FilterComponentChromaU "FilterComponent" )
 ADD_MODULE( FilterComponentChromaV "FilterComponent" )
 ADD_MODULE( FrameDifference "FrameDifference" )
+ADD_MODULE( AbsoluteFrameDifference "AbsoluteFrameDifference" )
 ADD_MODULE( MeasurePSNR "MeasurePSNR" )
 IF( USE_OPENCV )
   ADD_MODULE( DisparityStereoVar "DisparityStereoVar" )
diff --git a/modules/FrameDifference.cpp b/modules/FrameDifference.cpp
index cd0abd2..e7aabf4 100644
--- a/modules/FrameDifference.cpp
+++ b/modules/FrameDifference.cpp
@@ -23,6 +23,7 @@
  */
 
 #include "FrameDifference.h"
+#include <algorithm>
 
 namespace plaYUVer
 {
@@ -32,7 +33,7 @@ static PlaYUVerModuleDefinition FrameDifferenceDef =
     FRAME_PROCESSING_MODULE,
     "Measurements",
     "AbsoluteFrameDifference",
-    "Measure the difference between two images (Y plane), e. g., abs( Y1 - Y2 )",
+    "Measure the difference between two images (Y plane),  Y1 - Y2, with max absolute diff of 128",
     MODULE_REQUIRES_TWO_FRAMES,
     MODULE_REQUIRES_NEW_WINDOW,
     APPLY_WHILE_PLAYING,
@@ -55,13 +56,17 @@ PlaYUVerFrame* FrameDifference::process( PlaYUVerFrame* Input1, PlaYUVerFrame* I
   Pel* pInput2PelYUV = Input2->getPelBufferYUV()[0][0];
   Pel* pOutputPelYUV = m_pcFrameDifference->getPelBufferYUV()[0][0];
   Int aux_pel_1, aux_pel_2;
+  Int diff = 0;
 
   for( UInt y = 0; y < m_pcFrameDifference->getHeight(); y++ )
     for( UInt x = 0; x < m_pcFrameDifference->getWidth(); x++ )
     {
       aux_pel_1 = *pInput1PelYUV++;
       aux_pel_2 = *pInput2PelYUV++;
-      *pOutputPelYUV++ = abs( aux_pel_1 - aux_pel_2 );
+      diff = aux_pel_1 - aux_pel_2;
+      diff = std::min( diff, 127 );
+      diff = std::max( diff, -128 );
+      *pOutputPelYUV++ = diff;
     }
   return m_pcFrameDifference;
 }