diff --git a/imageviewer-qt4.cpp b/imageviewer-qt4.cpp
index 1b4725a..aafa773 100644
--- a/imageviewer-qt4.cpp
+++ b/imageviewer-qt4.cpp
@@ -548,7 +548,7 @@ void ImageViewer::applyBasicFilter() {
 	  QColor color = QColor::fromRgb(original->getImage()->pixel(x+dx, y+dy));
 	  color.getHsl(&h, &s, &l);
 	  //std::cout << "[" << fx << "," << fy <<"] " << l << " * " << data[fx*filter_size + fy] << " = ";
-	  intensity_sum += (l * data[fx*filter_size + fy]);
+	  intensity_sum += (l * data[fy*filter_size + fx]);
 	  //std::cout << intensity_sum << std::endl;
         }	
       }
@@ -619,7 +619,7 @@ void ImageViewer::applyBasicFilterWithOverflowHandling() {
 	  QColor color = QColor::fromRgb(original->getPixel(x+dx, y+dy, overflow_mode));
 	  color.getHsl(&h, &s, &l);
 	  //std::cout << "[" << fx << "," << fy <<"] " << l << " * " << data[fx*filter_size + fy] << " = ";
-	  intensity_sum += (l * data[fx*filter_size + fy]);
+	  intensity_sum += (l * data[fy*filter_size + fx]);
 	  //std::cout << intensity_sum << std::endl;
         }	
       }
@@ -649,7 +649,7 @@ void ImageViewer::applyBasicFilterWithOverflowHandling() {
  * @brief ImageViewer::runCannyEdge 
  */
 void ImageViewer::runCannyEdge(void) {
-  
+  //TODO
 }
 /**************************************************************************************** 
 *   
diff --git a/imageviewer-qt4.h b/imageviewer-qt4.h
index 1f7a299..3a8f942 100644
--- a/imageviewer-qt4.h
+++ b/imageviewer-qt4.h
@@ -170,6 +170,7 @@ class ImageViewer : public QMainWindow {
     void changeFilterSize(int s);
     void applyBasicFilter();
     void applyBasicFilterWithOverflowHandling();
+    void runCannyEdge(void);
 
     void open();
     void openReference();