diff --git a/cmake/ModuleDefault.cmake b/cmake/ModuleDefault.cmake
index cefe152..c8cba74 100644
--- a/cmake/ModuleDefault.cmake
+++ b/cmake/ModuleDefault.cmake
@@ -4,7 +4,7 @@
 
 ADD_MODULE( FilterFrame "FilterFrame.cpp" )
 ADD_MODULE( FrameDifference "FrameDifference.cpp" )
-#ADD_MODULE( MeasurePSNR "MeasurePSNR.cpp" )
+ADD_MODULE( MeasurePSNR "MeasurePSNR.cpp" )
 
 IF( USE_OPENCV )
   ADD_MODULE( DisparityStereoVar "DisparityStereoVar.cpp" )
diff --git a/source/app/ModulesHandle.cpp b/source/app/ModulesHandle.cpp
index 47c1ddd..6e968f9 100644
--- a/source/app/ModulesHandle.cpp
+++ b/source/app/ModulesHandle.cpp
@@ -106,7 +106,7 @@ SubWindowHandle* ModulesHandle::enableModuleIf( PlaYUVerModuleIf *pcCurrModuleIf
   QString windowName;
 
   UInt numberOfFrames = pcCurrModuleIf->m_cModuleDef.m_uiNumberOfFrames;
-  if( numberOfFrames > MODULE_REQUIRES_ONE_FRAME )
+  if( numberOfFrames > MODULE_REQUIRES_ONE_FRAME )  // Show dialog to select sub windows
   {
     DialogSubWindowSelector dialogWindowsSelection( m_pcParent, m_pcMdiArea, numberOfFrames );
     if( dialogWindowsSelection.exec() == QDialog::Accepted )
@@ -141,18 +141,30 @@ SubWindowHandle* ModulesHandle::enableModuleIf( PlaYUVerModuleIf *pcCurrModuleIf
   windowName.append( ">" );
 
   pcCurrModuleIf->m_pcDisplaySubWindow = NULL;
-  if( ( pcCurrModuleIf->m_cModuleDef.m_uiModuleRequirements & MODULE_REQUIRES_NEW_WINDOW ) || bShowModulesNewWindow )
+  if( pcCurrModuleIf->m_cModuleDef.m_iModuleType == FRAME_PROCESSING_MODULE )
   {
-    interfaceChild = new SubWindowHandle( m_pcParent, true );
-    interfaceChild->setWindowName( windowName );
-    connect( interfaceChild->getViewArea(), SIGNAL( positionChanged(const QPoint &, PlaYUVerFrame *) ), m_pcParent,
-        SLOT( updatePixelValueStatusBar(const QPoint &, PlaYUVerFrame *) ) );
-    pcCurrModuleIf->m_pcDisplaySubWindow = interfaceChild;
-    pcCurrModuleIf->m_pcDisplaySubWindow->setModule( pcCurrModuleIf );
+    if( ( pcCurrModuleIf->m_cModuleDef.m_uiModuleRequirements & MODULE_REQUIRES_NEW_WINDOW ) || bShowModulesNewWindow )
+    {
+      interfaceChild = new SubWindowHandle( m_pcParent, true );
+      interfaceChild->setWindowName( windowName );
+      connect( interfaceChild->getViewArea(), SIGNAL( positionChanged(const QPoint &, PlaYUVerFrame *) ), m_pcParent,
+          SLOT( updatePixelValueStatusBar(const QPoint &, PlaYUVerFrame *) ) );
+      pcCurrModuleIf->m_pcDisplaySubWindow = interfaceChild;
+      pcCurrModuleIf->m_pcDisplaySubWindow->setModule( pcCurrModuleIf );
+    }
+  }
+  if( pcCurrModuleIf->m_cModuleDef.m_iModuleType == FRAME_MEASUREMENT_MODULE )
+  {
+    if( pcCurrModuleIf->m_cModuleDef.m_uiModuleRequirements & MODULE_REQUIRES_SIDEBAR )
+    {
+      pcCurrModuleIf->m_pcModuleDock = new ModuleHandleDock( m_pcParent );
+    }
   }
 
+  // Create Module
   pcCurrModuleIf->create( pcCurrModuleIf->m_pcSubWindow[0]->getCurrFrame() );
 
+  // Associate module with subwindows
   for( UInt i = 0; i < numberOfFrames; i++ )
   {
     pcCurrModuleIf->m_pcSubWindow[i]->enableModule( pcCurrModuleIf );
@@ -251,7 +263,6 @@ Void ModulesHandle::openModuleIfStream( PlaYUVerModuleIf *pcCurrModuleIf )
       UInt Width = 0, Height = 0, FrameRate = 30;
       Int InputFormat = -1;
 
-
       QString supported = tr( "Supported Files (" );
       QStringList formatsList;
       QStringList formatsExt = PlaYUVerStream::supportedWriteFormatsExt();
diff --git a/source/app/PlaYUVerModuleIf.cpp b/source/app/PlaYUVerModuleIf.cpp
index 96e531a..48ca425 100644
--- a/source/app/PlaYUVerModuleIf.cpp
+++ b/source/app/PlaYUVerModuleIf.cpp
@@ -31,6 +31,7 @@ namespace plaYUVer
 PlaYUVerModuleIf::PlaYUVerModuleIf() :
         m_pcAction( NULL ),
         m_pcDisplaySubWindow( NULL ),
+        m_pcModuleDock( NULL ),
         m_pcModuleStream( NULL ),
         m_pcProcessedFrame( NULL )
 {
diff --git a/source/app/PlaYUVerModuleIf.h b/source/app/PlaYUVerModuleIf.h
index 7c45b42..1eaceee 100644
--- a/source/app/PlaYUVerModuleIf.h
+++ b/source/app/PlaYUVerModuleIf.h
@@ -31,6 +31,7 @@
 #include <cstdio>
 #include "PlaYUVerFrame.h"
 #include "PlaYUVerStream.h"
+#include "ModuleHandleDock.h"
 
 class QAction;
 
@@ -40,7 +41,6 @@ namespace plaYUVer
 enum // Module type
 {
   FRAME_PROCESSING_MODULE,
-  VIDEO_PROCESSING_MODULE,
   FRAME_MEASUREMENT_MODULE,
 };
 
@@ -96,7 +96,10 @@ class PlaYUVerModuleIf
 private:
   QAction* m_pcAction;
   SubWindowHandle* m_pcSubWindow[MAX_NUMBER_FRAMES];
+
   SubWindowHandle* m_pcDisplaySubWindow;
+  ModuleHandleDock* m_pcModuleDock;
+
   PlaYUVerModuleDefinition m_cModuleDef;
 
   PlaYUVerStream* m_pcModuleStream;
@@ -126,11 +129,14 @@ public:
   virtual Void create() {}
   virtual Void create( PlaYUVerFrame* ) {}
 
-  virtual Void            process() {}
   virtual PlaYUVerFrame*  process( PlaYUVerFrame* ) { return NULL; }
   virtual PlaYUVerFrame*  process( PlaYUVerFrame*, PlaYUVerFrame* ) { return NULL; }
   virtual PlaYUVerFrame*  process( PlaYUVerFrame*, PlaYUVerFrame*, PlaYUVerFrame* ) { return NULL; }
 
+  virtual Double          measure( PlaYUVerFrame* ) { return 0; }
+  virtual Double          measure( PlaYUVerFrame*, PlaYUVerFrame* ) { return 0; }
+  virtual Double          measure( PlaYUVerFrame*, PlaYUVerFrame*, PlaYUVerFrame* ) { return 0; }
+
   virtual Void destroy() { }
 
   Void setModuleDefinition( PlaYUVerModuleDefinition def ) { m_cModuleDef = def; }
diff --git a/source/modules/MeasurePSNR.cpp b/source/modules/MeasurePSNR.cpp
index e20dfd3..d344c5b 100644
--- a/source/modules/MeasurePSNR.cpp
+++ b/source/modules/MeasurePSNR.cpp
@@ -19,7 +19,7 @@
 
 /**
  * \file     MeasurePSNR.cpp
- * \brief    Measure PSNR module
+ * \brief    Frame Difference module
  */
 
 #include <cstdio>
@@ -37,32 +37,41 @@ static PlaYUVerModuleDefinition MeasurePSNRDef =
     "PSNR",
     "Measure the PSNR between two images",
     MODULE_REQUIRES_TWO_FRAMES,
-    MODULE_REQUIRES_NEW_WINDOW,
+    MODULE_REQUIRES_SIDEBAR,
     APPLY_WHILE_PLAYING,
 };
 
 MeasurePSNR::MeasurePSNR()
 {
-  m_pcFilteredFrame = NULL;
   setModuleDefinition( MeasurePSNRDef );
 }
 
-Void MeasurePSNR::create( PlaYUVerFrame* InputFrame )
+Void MeasurePSNR::create( PlaYUVerFrame* Org )
 {
-  m_pcFilteredFrame = NULL;
-  m_pcFilteredFrame = new PlaYUVerFrame( InputFrame->getWidth(), InputFrame->getHeight(), PlaYUVerFrame::GRAY );
 }
 
-PlaYUVerFrame* MeasurePSNR::process( PlaYUVerFrame* InputFrame )
+Double MeasurePSNR::measure( PlaYUVerFrame* Org, PlaYUVerFrame* Rec )
 {
-  return m_pcFilteredFrame;
+  Pel* pInput1PelYUV = Org->getPelBufferYUV()[0][0];
+  Pel* pInput2PelYUV = Rec->getPelBufferYUV()[0][0];
+
+  Int aux_pel_1, aux_pel_2;
+  Double diff = 0;
+
+  for( UInt y = 0; y < Org->getHeight(); y++ )
+    for( UInt x = 0; x < Org->getWidth(); x++ )
+    {
+      aux_pel_1 = *pInput1PelYUV++;
+      aux_pel_2 = *pInput2PelYUV++;
+      diff += abs( aux_pel_1 - aux_pel_2 );
+    }
+
+  return diff;
 }
 
 Void MeasurePSNR::destroy()
 {
-  if( m_pcFilteredFrame )
-    delete m_pcFilteredFrame;
-  m_pcFilteredFrame = NULL;
+
 }
 
 }  // NAMESPACE
diff --git a/source/modules/MeasurePSNR.h b/source/modules/MeasurePSNR.h
index 5de073c..84c5fc7 100644
--- a/source/modules/MeasurePSNR.h
+++ b/source/modules/MeasurePSNR.h
@@ -19,17 +19,16 @@
 
 /**
  * \file     MeasurePSNR.h
- * \brief    Measure PSNR module
+ * \brief    Frame Difference module
  */
 
 #ifndef __MEASUREPSNR_H__
 #define __MEASUREPSNR_H__
 
 #include "config.h"
-
+#include "PlaYUVerDefs.h"
 #include <iostream>
 #include <cstdio>
-#include "TypeDef.h"
 #include "PlaYUVerFrame.h"
 #include "PlaYUVerModuleIf.h"
 
@@ -47,10 +46,8 @@ public:
   virtual ~MeasurePSNR()
   {
   }
-
-  Void create( PlaYUVerFrame* InputFrame );
-
-  PlaYUVerFrame* process( PlaYUVerFrame* InputFrame );
+  Void create( PlaYUVerFrame* );
+  Double measure( PlaYUVerFrame*, PlaYUVerFrame* );
   Void destroy();
 
 };