diff --git a/source/app/ModulesHandle.cpp b/source/app/ModulesHandle.cpp
index 44cbc9e..31ecc94 100644
--- a/source/app/ModulesHandle.cpp
+++ b/source/app/ModulesHandle.cpp
@@ -96,16 +96,36 @@ SubWindowHandle* ModulesHandle::toggleSelectedModuleIf()
     else
     {
       pcSubWindow->enableModule( currModuleIf );
+      currModuleIf->m_pcDisplaySubWindow = pcSubWindow;
     }
     currModuleIf->m_pcSubWindow = pcSubWindow;
   }
   else
   {
+    QCoreApplication::processEvents();
     destroyModuleIf( currModuleIf );
   }
   return interfaceChild;
 }
 
+PlaYUVerFrame* ModulesHandle::applyModuleIf( PlaYUVerModuleIf *pcCurrModuleIf )
+{
+  PlaYUVerFrame* processedFrame;
+
+  switch( pcCurrModuleIf->m_cModuleDef.m_uiNumberOfFrames )
+  {
+  case MODULE_REQUIRES_ONE_FRAME:
+    processedFrame = pcCurrModuleIf->process( pcCurrModuleIf->m_pcSubWindow->getCurrFrame() );
+    break;
+  case MODULE_REQUIRES_TWO_FRAMES:
+    break;
+  case MODULE_REQUIRES_THREE_FRAMES:
+    break;
+  }
+  pcCurrModuleIf->m_pcDisplaySubWindow->setCurrFrame( processedFrame );
+  return processedFrame;
+}
+
 Void ModulesHandle::destroyModuleIf( PlaYUVerModuleIf *pcCurrModuleIf )
 {
   pcCurrModuleIf->m_pcAction->setChecked( false );
@@ -140,7 +160,7 @@ QMenu* ModulesHandle::createMenus( QMenuBar *MainAppMenuBar )
 
   m_pcModulesMenu = MainAppMenuBar->addMenu( "&Modules" );
 
-  //m_arrayModulesActions.resize( m_uiModulesCount );
+//m_arrayModulesActions.resize( m_uiModulesCount );
 
   for( Int i = 0; i < m_pcPlaYUVerModules.size(); i++ )
   {
diff --git a/source/app/ModulesHandle.h b/source/app/ModulesHandle.h
index 30db126..8ea628e 100644
--- a/source/app/ModulesHandle.h
+++ b/source/app/ModulesHandle.h
@@ -55,6 +55,7 @@ public:
   Void updateMenus( Bool hasSubWindow );
   SubWindowHandle* toggleSelectedModuleIf();
 
+  static PlaYUVerFrame* applyModuleIf( PlaYUVerModuleIf *pcCurrModuleIf );
   static Void destroyModuleIf( PlaYUVerModuleIf* pcCurrModuleIf );
 
 private:
diff --git a/source/app/PlaYUVerModuleIf.h b/source/app/PlaYUVerModuleIf.h
index f8d3bcc..178a1c5 100644
--- a/source/app/PlaYUVerModuleIf.h
+++ b/source/app/PlaYUVerModuleIf.h
@@ -47,10 +47,12 @@ enum __PlaYUVerModuleTypes
 
 enum __PlaYUVerModuleRequirements
 {
-  MODULE_REQUIRES_FRAME = 1,
-  MODULE_REQUIRES_TWOFRAMES = 2,
-  MODULE_REQUIRES_NEW_WINDOW = 4,
-  MODULE_REQUIRES_SIDEBAR = 8,
+  MODULE_REQUIRES_ONE_FRAME = 1,
+  MODULE_REQUIRES_TWO_FRAMES = 2,
+  MODULE_REQUIRES_THREE_FRAMES = 3,
+  MODULE_REQUIRES_NOTHING = 0,
+  MODULE_REQUIRES_NEW_WINDOW = 2,
+  MODULE_REQUIRES_SIDEBAR = 4,
   MODULES_REQUIREMENTS_TOTAL,
 };
 
@@ -69,6 +71,7 @@ typedef struct __PlaYUVerModuleDefinition
   const Char* m_pchModuleCategory;
   const Char* m_pchModuleName;
   const Char* m_pchModuleTooltip;
+  UInt m_uiNumberOfFrames;
   UInt m_uiModuleRequirements;
 } PlaYUVerModuleDefinition;
 
diff --git a/source/modules/FilterFrame.cpp b/source/modules/FilterFrame.cpp
index 6a40d0a..16a6d80 100644
--- a/source/modules/FilterFrame.cpp
+++ b/source/modules/FilterFrame.cpp
@@ -35,7 +35,8 @@ PlaYUVerModuleDefinition FilterFrameDef = {
     "Filters",
     "Y_Filter",
     "Filter Y matrix of YUV frame",
-    MODULE_REQUIRES_FRAME,
+    MODULE_REQUIRES_ONE_FRAME,
+    MODULE_REQUIRES_NOTHING,
 };
 
 FilterFrame::FilterFrame()
diff --git a/source/modules/FrameDifference.cpp b/source/modules/FrameDifference.cpp
index 7199c2c..87d89d5 100644
--- a/source/modules/FrameDifference.cpp
+++ b/source/modules/FrameDifference.cpp
@@ -36,7 +36,8 @@ static PlaYUVerModuleDefinition FrameDifferenceDef =
     "Measurements",
     "FrameDifference",
     "Measure the difference between two images (Y plane)",
-    MODULE_REQUIRES_TWOFRAMES | MODULE_REQUIRES_NEW_WINDOW,
+    MODULE_REQUIRES_TWO_FRAMES,
+    MODULE_REQUIRES_NEW_WINDOW,
 };
 
 FrameDifference::FrameDifference()
diff --git a/source/modules/MeasurePSNR.cpp b/source/modules/MeasurePSNR.cpp
index 9cf2b0c..d60ffc6 100644
--- a/source/modules/MeasurePSNR.cpp
+++ b/source/modules/MeasurePSNR.cpp
@@ -36,7 +36,8 @@ static PlaYUVerModuleDefinition MeasurePSNRDef =
     "Measurements",
     "PSNR",
     "Measure the PSNR between two images",
-    MODULE_REQUIRES_TWOFRAMES | MODULE_REQUIRES_SIDEBAR,
+    MODULE_REQUIRES_TWO_FRAMES,
+    MODULE_REQUIRES_NEW_WINDOW,
 };
 
 MeasurePSNR::MeasurePSNR()