diff --git a/gui/OpenFaceOffline/MainWindow.xaml.cs b/gui/OpenFaceOffline/MainWindow.xaml.cs
index 92fa112..3ffa39b 100644
--- a/gui/OpenFaceOffline/MainWindow.xaml.cs
+++ b/gui/OpenFaceOffline/MainWindow.xaml.cs
@@ -136,7 +136,7 @@ namespace OpenFaceOffline
         public bool DynamicAUModels { get; set; } = true;
 
         // Camera calibration parameters
-        public double fx = -1, fy = -1, cx = -1, cy = -1;
+        public float fx = -1, fy = -1, cx = -1, cy = -1;
         bool estimate_camera_parameters = true;
 
         public MainWindow()
@@ -343,10 +343,10 @@ namespace OpenFaceOffline
             // If the camera calibration parameters are not set (indicated by -1), guesstimate them
             if(estimate_camera_parameters || fx == -1 || fy == -1 || cx == -1 || cy == -1)
             { 
-                fx = 500.0 * (capture.width / 640.0);
-                fy = 500.0 * (capture.height / 480.0);
+                fx = 500.0f * (capture.width / 640.0f);
+                fy = 500.0f * (capture.height / 480.0f);
 
-                fx = (fx + fy) / 2.0;
+                fx = (fx + fy) / 2.0f;
                 fy = fx;
 
                 cx = capture.width / 2f;
@@ -472,7 +472,7 @@ namespace OpenFaceOffline
 
         }
 
-        private void VisualizeFeatures(RawImage frame, Visualizer visualizer, List<Tuple<double, double>> landmarks, bool new_image, double fx, double fy, double cx, double cy, double progress)
+        private void VisualizeFeatures(RawImage frame, Visualizer visualizer, List<Tuple<double, double>> landmarks, bool new_image, float fx, float fy, float cx, float cy, double progress)
         {
 
             List<Tuple<Point, Point>> lines = null;
@@ -494,6 +494,10 @@ namespace OpenFaceOffline
             double scale = 0;
 
             // Helps with recording and showing the visualizations
+            if(new_image)
+            {
+                visualizer.SetImage(frame, fx, fy, cx, cy);
+            }
             visualizer.SetObservationHOG(face_analyser.GetLatestHOGFeature(), face_analyser.GetHOGRows(), face_analyser.GetHOGCols());
             visualizer.SetObservationLandmarks(landmarks, confidence); // Set confidence to high to make sure we always visualize
             visualizer.SetObservationPose(pose, confidence);
@@ -503,11 +507,11 @@ namespace OpenFaceOffline
             {
                 
                 eye_landmarks = clnf_model.CalculateVisibleEyeLandmarks();
-                lines = clnf_model.CalculateBox((float)fx, (float)fy, (float)cx, (float)cy);
+                lines = clnf_model.CalculateBox(fx, fy, cx, cy);
 
                 scale = clnf_model.GetRigidParams()[0];
 
-                gaze_lines = gaze_analyser.CalculateGazeLines(scale, (float)fx, (float)fy, (float)cx, (float)cy);
+                gaze_lines = gaze_analyser.CalculateGazeLines(scale, fx, fy, cx, cy);
                 gaze_angle = gaze_analyser.GetGazeAngle();
             }
 
diff --git a/gui/OpenFaceOffline/UI_items/CameraParametersEntry.xaml.cs b/gui/OpenFaceOffline/UI_items/CameraParametersEntry.xaml.cs
index 9061efe..7bf0db7 100644
--- a/gui/OpenFaceOffline/UI_items/CameraParametersEntry.xaml.cs
+++ b/gui/OpenFaceOffline/UI_items/CameraParametersEntry.xaml.cs
@@ -78,7 +78,7 @@ namespace OpenFaceOffline
     /// </summary>
     public partial class CameraParametersEntry : Window
     {
-        public CameraParametersEntry(double fx, double fy, double cx, double cy)
+        public CameraParametersEntry(float fx, float fy, float cx, float cy)
         {
             InitializeComponent();
             this.KeyDown += new KeyEventHandler(TextEntry_KeyDown);
@@ -122,26 +122,26 @@ namespace OpenFaceOffline
             }
         }
 
-        private double fx = -1, fy = -1, cx = -1, cy = -1;
+        private float fx = -1, fy = -1, cx = -1, cy = -1;
 
         public bool IsAutomatic
         {
             get { return automaticCheckBox.IsChecked == true; }
         }
-        public double Fx
+        public float Fx
         {
             get { return automaticCheckBox.IsChecked == true ? -1 : fx; }
         }
 
-        public double Fy
+        public float Fy
         {
             get { return automaticCheckBox.IsChecked == true ? -1 : fy; }
         }
-        public double Cx
+        public float Cx
         {
             get { return automaticCheckBox.IsChecked == true ? -1 : cx; }
         }
-        public double Cy
+        public float Cy
         {
             get { return automaticCheckBox.IsChecked == true ? -1 : cy; }
         }
@@ -169,10 +169,10 @@ namespace OpenFaceOffline
         {
             try
             {
-                double fx_n = Double.Parse(fxTextBox.Text);
-                double fy_n = Double.Parse(fyTextBox.Text);
-                double cx_n = Double.Parse(cxTextBox.Text);
-                double cy_n = Double.Parse(cyTextBox.Text);
+                float fx_n = (float)Double.Parse(fxTextBox.Text);
+                float fy_n = (float)Double.Parse(fyTextBox.Text);
+                float cx_n = (float)Double.Parse(cxTextBox.Text);
+                float cy_n = (float)Double.Parse(cyTextBox.Text);
 
                 if (fx_n > 0 && fy_n > 0 && cx_n > 0 && cy_n > 0)
                 {
diff --git a/lib/local/CppInerop/VisualizerInterop.h b/lib/local/CppInerop/VisualizerInterop.h
index 1c8033c..512d4a5 100644
--- a/lib/local/CppInerop/VisualizerInterop.h
+++ b/lib/local/CppInerop/VisualizerInterop.h
@@ -113,6 +113,11 @@ namespace UtilitiesOF {
 			m_visualizer->SetObservationLandmarks(landmarks_2D_mat, confidence);
 		}
 
+		void SetImage(OpenCVWrappers::RawImage^ canvas, float fx, float fy, float cx, float cy)
+		{
+			m_visualizer->SetImage(canvas->Mat, fx, fy, cx, cy);
+		}
+
 		OpenCVWrappers::RawImage^ GetHOGVis()
 		{
 			OpenCVWrappers::RawImage^ hog_image = gcnew OpenCVWrappers::RawImage(m_visualizer->GetHOGVis());