diff --git a/canny_edge_machine.cpp b/canny_edge_machine.cpp
index d67de1b..c11bbfc 100644
--- a/canny_edge_machine.cpp
+++ b/canny_edge_machine.cpp
@@ -311,6 +311,10 @@ class CannyEdgeMachine {
       this->showEdges();      
     };
     
+    int* getBinaryEdgePixels(void) {
+      return this->binary_edge_pixels;
+    };
+    
 };
 
 #endif
diff --git a/imageviewer-qt4.cpp b/imageviewer-qt4.cpp
index 5f79071..e9f97b7 100644
--- a/imageviewer-qt4.cpp
+++ b/imageviewer-qt4.cpp
@@ -717,12 +717,14 @@ void ImageViewer::runCannyEdgeThirdStep(void) {
 }
 
 /**
- * Apply results of canny edge using unsharp masking.
+ * Do generic usm.
  * 
  * @brief ImageViewer::doUnsharpMasking
  */
 void ImageViewer::doUnsharpMasking(void) {
-  logFile << "Doing USM ..." << std::endl;
+  double alpha = usm_sharpening->value();
+  int gauss_width = usm_gauss_width->value();
+  logFile << "Doing USM using gauss width of " << gauss_width << " and alpha of " << alpha << std::endl;
   renewLogging();
   updateImageDisplay();
 }
@@ -1016,6 +1018,14 @@ void ImageViewer::generateControlPanels() {
   t_high_spinbox->setDecimals(5);
   t_high_spinbox->setValue(4.0);
   
+  usm_sharpening = new QDoubleSpinBox();
+  usm_sharpening->setDecimals(5);
+  usm_sharpening->setValue(1.0);
+
+  usm_gauss_width = new QDoubleSpinBox();
+  usm_gauss_width->setDecimals(5);
+  usm_gauss_width->setValue(3);
+  
   run_usm = new QPushButton("Apply unsharp masking!");
   QObject::connect(run_usm, SIGNAL(clicked()), this, SLOT(doUnsharpMasking()));
  
@@ -1031,7 +1041,11 @@ void ImageViewer::generateControlPanels() {
   task_tab5_scrolllayout->addWidget(t_high_spinbox);
   task_tab5_scrolllayout->addWidget(run_canny_edge_third_step);
   task_tab5_scrolllayout->addWidget(run_canny_edge);
-  task_tab5_scrolllayout->addWidget(new QLabel("Unsharp masking"));
+  task_tab5_scrolllayout->addWidget(new QLabel(" --- Unsharp masking --- ");
+  task_tab5_scrolllayout->addWidget(new QLabel("Sharpening factor alpha"));
+  task_tab5_scrolllayout->addWidget(usm_sharpening);
+  task_tab5_scrolllayout->addWidget(new QLabel("Gauss filter width sigma"));
+  task_tab5_scrolllayout->addWidget(usm_gauss_width);
   task_tab5_scrolllayout->addWidget(run_usm);
   
   tabWidget->addTab(task_tab5_widget, "Task #5");
diff --git a/imageviewer-qt4.h b/imageviewer-qt4.h
index 65aa314..0ac5226 100644
--- a/imageviewer-qt4.h
+++ b/imageviewer-qt4.h
@@ -156,6 +156,8 @@ class ImageViewer : public QMainWindow {
     QPushButton* run_canny_edge_second_step;
     QPushButton* run_canny_edge_third_step;
     QPushButton* run_usm;
+    QDoubleSpinBox* usm_sharpening;    
+    QDoubleSpinBox* usm_gauss_width;
     
     // "My" space for storing data/results
     LazyImage* original;