Actually add the gaussian blur

Processing/processing.cpp

@@ -16,6 +16,7 @@ void Processing::processImage(Mat& inputPicture, int thresholdValue, int gaussKe
     // No return value here as the input is passed by reference -> directly modified.
     cvtColor(inputPicture, inputPicture, COLOR_BGR2GRAY);
     threshold(inputPicture, inputPicture, thresholdValue, 255, THRESH_BINARY);
+    GaussianBlur(inputPicture, inputPicture, Size(gaussKernelSize, gaussKernelSize), 0);
 }
 
 std::vector<LFRLine> Processing::calculateLineSegments(const Mat& inputPicture)