diff --git a/filter_gui.cpp b/filter_gui.cpp
index e2e0d52..ee1e7fe 100644
--- a/filter_gui.cpp
+++ b/filter_gui.cpp
@@ -16,27 +16,54 @@ class FilterGui {
   private:
     QTableWidget* widget;
     
-    int filter_size;
+    int size;
+    int* data;
+    
+    void recreateDataStorage() {
+      if(data != NULL) {
+	delete data;
+	data = NULL;
+      }
+      int fields = this->size * this->size;
+      data = (int*) malloc(sizeof(int) * fields);
+      for(int i=0; i<fields; i++) data[i] = 0;
+    }
     
     void updateGui() {
-      this->widget->setRowCount(this->filter_size);
-      this->widget->setColumnCount(this->filter_size);
-      for(int i=0; i<this->filter_size; i++) {
-        for(int j=0; j<this->filter_size; j++) {
+      this->widget->setRowCount(this->size);
+      this->widget->setColumnCount(this->size);
+      for(int i=0; i<this->size; i++) {
+        for(int j=0; j<this->size; j++) {
 	  this->widget->setItem(i, j, new QTableWidgetItem("0"));
 	}
       }
     };
+    
+    void fetchData() {
+      for(int i=0; i<this->size; i++) {
+	for(int j=0; j<this->size; j++) {
+	  QString temp = this->widget->item(i, j)->text();
+	  this->data[i*this->size + j] = temp.toInt();
+	}
+      }
+    };
 
   public:
     FilterGui(int filter_size = 3) {
+      this->data = NULL;
       this->widget = new QTableWidget();
       this->setSize(filter_size);
     };
     
     ~FilterGui() {
-      delete this->widget;
-      this->widget = NULL;
+      if(this->widget != NULL) {
+	delete this->widget;
+        this->widget = NULL;
+      }
+      if(this->data != NULL) {
+	delete this->data;
+        this->data = NULL;
+      }
     };
 
     QTableWidget* getWidget() {
@@ -44,13 +71,19 @@ class FilterGui {
     };
     
     void setSize(int size) {
-      this->filter_size = size;
+      this->size = size;
       this->updateGui();
     };
     
     int getSize() {
-      return this->filter_size;
+      return this->size;
     };
+    
+    int* getData() {
+      this->recreateDataStorage();
+      this->fetchData();
+      return this->data;
+    }
 
 };
 
diff --git a/imageviewer-qt4.cpp b/imageviewer-qt4.cpp
index b98cca0..b9307ca 100644
--- a/imageviewer-qt4.cpp
+++ b/imageviewer-qt4.cpp
@@ -472,6 +472,21 @@ void ImageViewer::succeedingHistogrammAdaption() {
   updateImageDisplay();
 }
 
+void ImageViewer::applyFilter() {
+  logFile << "Applying filter ...";
+  
+  int* data = filter_gui->getData();
+  
+  for(int i=0; i<filter_gui->getSize(); i++) {
+    for(int j=0; j<filter_gui->getSize(); j++) {
+      logFile << "@" << i << "," << j << " -> " << data[i*filter_gui->getSize() + j] << std::endl;
+    }
+  }
+  
+  logFile << "done." << std::endl;
+  renewLogging();
+  //updateImageDisplay();
+}
 
 
 /**************************************************************************************** 
@@ -700,8 +715,12 @@ void ImageViewer::generateControlPanels() {
   
   filter_gui = new FilterGui();
   
+  apply_filter = new QPushButton("Apply filter");
+  QObject::connect(apply_filter, SIGNAL(clicked()), this, SLOT(applyFilter()));
+
   task_tab4_scrolllayout->addWidget(filter_size_slider);
   task_tab4_scrolllayout->addWidget(filter_gui->getWidget());
+  task_tab4_scrolllayout->addWidget(apply_filter);
   
   tabWidget->addTab(task_tab4_widget, "Task #4");
   
diff --git a/imageviewer-qt4.h b/imageviewer-qt4.h
index 829b1a3..a524d87 100644
--- a/imageviewer-qt4.h
+++ b/imageviewer-qt4.h
@@ -134,6 +134,7 @@ class ImageViewer : public QMainWindow {
     
     QSlider* filter_size_slider;
     FilterGui* filter_gui;
+    QPushButton* apply_filter;
     
     // "My" space for storing data/results
     LazyImage* original;
@@ -156,6 +157,7 @@ class ImageViewer : public QMainWindow {
     void partialLinearHistogrammAdaption();
     void succeedingHistogrammAdaption();
     void changeFilterSize(int s);
+    void applyFilter();
 
     void open();
     void openReference();