diff --git a/filter_gui.cpp b/filter_gui.cpp
new file mode 100644
index 0000000..e2e0d52
--- /dev/null
+++ b/filter_gui.cpp
@@ -0,0 +1,58 @@
+#ifndef FILTER_GUI_C
+#define FILTER_GUI_C
+
+#include <QtGlobal>
+#include <QMainWindow>
+#include <QColor>
+#include <qboxlayout.h>
+#include <QTableWidget>
+
+#include <iostream>
+
+#include <math.h>
+
+class FilterGui {
+  
+  private:
+    QTableWidget* widget;
+    
+    int filter_size;
+    
+    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->setItem(i, j, new QTableWidgetItem("0"));
+	}
+      }
+    };
+
+  public:
+    FilterGui(int filter_size = 3) {
+      this->widget = new QTableWidget();
+      this->setSize(filter_size);
+    };
+    
+    ~FilterGui() {
+      delete this->widget;
+      this->widget = NULL;
+    };
+
+    QTableWidget* getWidget() {
+      return this->widget;
+    };
+    
+    void setSize(int size) {
+      this->filter_size = size;
+      this->updateGui();
+    };
+    
+    int getSize() {
+      return this->filter_size;
+    };
+
+};
+
+
+#endif
diff --git a/imageviewer-qt4.cpp b/imageviewer-qt4.cpp
index 5c92099..b98cca0 100644
--- a/imageviewer-qt4.cpp
+++ b/imageviewer-qt4.cpp
@@ -480,6 +480,12 @@ void ImageViewer::succeedingHistogrammAdaption() {
 *
 *****************************************************************************************/
 
+void ImageViewer::changeFilterSize(int s) {
+  filter_gui->setSize(((s+1)*2)+1);
+  logFile << "done." << std::endl;
+  renewLogging();
+}
+
 void ImageViewer::generateControlPanels() {
   // Tab for first task
   task_tab1_widget = new QWidget();
@@ -686,7 +692,16 @@ void ImageViewer::generateControlPanels() {
   task_tab4_scrolllayout->setSizeConstraint(QLayout::SetMaximumSize);
   task_tab4_scrollwidget->setLayout(task_tab4_scrolllayout);
   
+  filter_size_slider = new QSlider(Qt::Horizontal);
+  filter_size_slider->setMinimum(0);
+  filter_size_slider->setMaximum(4);
+  filter_size_slider->setValue(0);
+  QObject::connect(filter_size_slider, SIGNAL(valueChanged(int)), this, SLOT(changeFilterSize(int)));
   
+  filter_gui = new FilterGui();
+  
+  task_tab4_scrolllayout->addWidget(filter_size_slider);
+  task_tab4_scrolllayout->addWidget(filter_gui->getWidget());
   
   tabWidget->addTab(task_tab4_widget, "Task #4");
   
diff --git a/imageviewer-qt4.h b/imageviewer-qt4.h
index 67bbcd2..829b1a3 100644
--- a/imageviewer-qt4.h
+++ b/imageviewer-qt4.h
@@ -55,6 +55,7 @@
 #include <iostream>
 
 #include "lazy_image.cpp"
+#include "filter_gui.cpp"
 
 class QAction;
 class QLabel;
@@ -131,6 +132,9 @@ class ImageViewer : public QMainWindow {
     QScrollArea* task_tab4_scrollarea;
     QVBoxLayout* task_tab4_scrolllayout;
     
+    QSlider* filter_size_slider;
+    FilterGui* filter_gui;
+    
     // "My" space for storing data/results
     LazyImage* original;
     LazyImage* working_copy;
@@ -151,6 +155,7 @@ class ImageViewer : public QMainWindow {
     void linearHistogrammAdaption();
     void partialLinearHistogrammAdaption();
     void succeedingHistogrammAdaption();
+    void changeFilterSize(int s);
 
     void open();
     void openReference();