From 66e2ae8d304a7d357133d161bf9a67996e18c46e Mon Sep 17 00:00:00 2001
From: Jan Philipp Timme <jan.philipp@timme.it>
Date: Tue, 5 Jan 2016 18:21:22 +0100
Subject: [PATCH] [TASK] Fix gauss filter not being centered.

---
 canny_edge_machine.cpp | 4 +++-
 imageviewer-qt4.cpp    | 3 +++
 2 files changed, 6 insertions(+), 1 deletion(-)

diff --git a/canny_edge_machine.cpp b/canny_edge_machine.cpp
index c11bbfc..2cd0506 100644
--- a/canny_edge_machine.cpp
+++ b/canny_edge_machine.cpp
@@ -89,8 +89,10 @@ class CannyEdgeMachine {
       double sum_weights = 0;
       std::cout << "Using gauss filter: " << std::endl;
       for(int x=0; x<filter_width; x++) {
+	int i = x - (filter_width/2);
 	for(int y=0; y<filter_width; y++) {
-	  filter[x*filter_width + y] = this->gauss(x, y, sigma);
+	  int j = y - (filter_width/2);
+	  filter[x*filter_width + y] = this->gauss(i, j, sigma);
 	  sum_weights += filter[x*filter_width + y];
 	  std::cout << "(" << x << ", " << y << ") " << filter[x*filter_width + y] << " | ";
 	}
diff --git a/imageviewer-qt4.cpp b/imageviewer-qt4.cpp
index 3b03efd..7990bde 100644
--- a/imageviewer-qt4.cpp
+++ b/imageviewer-qt4.cpp
@@ -726,6 +726,9 @@ void ImageViewer::doUnsharpMasking(void) {
   int gauss_width = usm_gauss_width->value();
   logFile << "Doing USM using gauss width of " << gauss_width << " and alpha of " << alpha << std::endl;
   renewLogging();
+  
+  
+  
   updateImageDisplay();
 }
 /****************************************************************************************