Buenas,

After the first 2 posts

• [# KINECT] HowTo: Use Face Recognition with # KinectSdk (I)
  http://elbruno.com/2012/07/31/kinect-HOWTO-Utilizar-face-recognition-con-kinectsdk-i/
• [# KINECT] HowTo: Use Face Recognition with # KinectSdk (II)
  http://elbruno.com/2012/08/07/kinect-HOWTO-Utilizar-face-recognition-con-kinectsdk-II/

Today we will see how to modify the “network” that is drawn in our face using the example from the previous post. Reviewing a little how is it mounted, we see that the UserControl [FaceTracking.xaml] is showing the network with the face on an image which shows the output of the camera of the Kinect sensor.

To paint the network, the [SkeletonFaceTracker.cs] class uses the routine DrawFaceModel()which creates a collection of triangles and then paints them.

   1: public void DrawFaceModel(DrawingContext drawingContext)

   2: {

   3:     if (!LastFaceTrackSucceeded || _skeletonTrackingState != SkeletonTrackingState.Tracked)

   4:     {

   5:         _startFaceRecognition = DateTime.MinValue;

   6:         return;

   7:     }

   8:  

   9:     var faceModelPts = _facePoints.Select(t => new Point(t.X + 0.5f, t.Y + 0.5f)).ToList();

  10:  

  11:     var faceModel = _faceTriangles.Select(t => new FaceModelTriangle

  12:                                                    {

  13:                                                        P1 = faceModelPts[t.First], 

  14:                                                        P2 = faceModelPts[t.Second], 

  15:                                                        P3 = faceModelPts[t.Third]

  16:                                                    }).ToList();

  17:  

  18:     var faceModelGroup = new GeometryGroup();

  19:     for (var i = 0; i < faceModel.Count; i++)

  20:     {

  21:         var faceTriangle = new GeometryGroup();

  22:         faceTriangle.Children.Add(new LineGeometry(faceModel[i].P1, faceModel[i].P2));

  23:         faceTriangle.Children.Add(new LineGeometry(faceModel[i].P2, faceModel[i].P3));

  24:         faceTriangle.Children.Add(new LineGeometry(faceModel[i].P3, faceModel[i].P1));

  25:         faceModelGroup.Children.Add(faceTriangle);

  26:     }

  27:  

  28:     drawingContext.DrawGeometry(Brushes.BlueViolet, new Pen(Brushes.Red, 1.0), faceModelGroup);

  29:     if (_startFaceRecognition == DateTime.MinValue)

  30:     {

  31:         _startFaceRecognition = DateTime.Now;

  32:     }

  33:     else

  34:     {

  35:         if (DateTime.Now.Subtract(_startFaceRecognition).TotalSeconds > 5)

  36:         {

  37:             Application.Current.Dispatcher.BeginInvoke(new Action(() =>

  38:             {

  39:                 System.Threading.Thread.Sleep(300);

  40:                 _startFaceRecognition = DateTime.MinValue;

  41:             }));

  42:         }

  43:     }

  44: }

For the slightly improving of this example, rather than painting the network on the face, what we will do is paint points and also at every point put the number of the same. What we do is create a new function called with the following code.

   1: public void DrawFaceFlat(DrawingContext drawingContext)

   2: {

   3:     if (!LastFaceTrackSucceeded || _skeletonTrackingState != SkeletonTrackingState.Tracked)

   4:     {

   5:         _startFaceRecognition = DateTime.MinValue;

   6:         return;

   7:     }

   8:  

   9:     var faceModelPts = _facePoints.Select(t => new Point(t.X + 0.5f, t.Y + 0.5f)).ToList();

  10:  

  11:     var faceModelGroup = new GeometryGroup();

  12:     for (var i = 0; i < faceModelPts.Count; i++)

  13:     {

  14:         var geometryGroup = new GeometryGroup();

  15:         var ellipseGeometry = new EllipseGeometry(faceModelPts[i], 1, 1);

  16:  

  17:         var formattedText = new FormattedText(i.ToString(), CultureInfo.InvariantCulture, FlowDirection.LeftToRight,

  18: new Typeface("Verdana"), 12, Brushes.White);

  19:         geometryGroup.Children.Add(ellipseGeometry);

  20:         faceModelGroup.Children.Add(geometryGroup);

  21:     }

  22:  

  23:     drawingContext.DrawGeometry(Brushes.Yellow, new Pen(Brushes.Yellow, 1.0), faceModelGroup);

  24:  

  25:     for (var i = 0; i < faceModelPts.Count; i++)

  26:     {

  27:         var formattedText = new FormattedText(i.ToString(), CultureInfo.InvariantCulture, FlowDirection.LeftToRight, new Typeface("Verdana"), 8, Brushes.White);

  28:         drawingContext.DrawText(formattedText, faceModelPts[i]);

  29:     }

  30:  

  31:     if (_startFaceRecognition == DateTime.MinValue)

  32:     {

  33:         _startFaceRecognition = DateTime.Now;

  34:     }

  35:     else

  36:     {

  37:         if (DateTime.Now.Subtract(_startFaceRecognition).TotalSeconds > 5)

  38:         {

  39:             Application.Current.Dispatcher.BeginInvoke(new Action(() =>

  40:             {

  41:                 System.Threading.Thread.Sleep(300);

  42:                 _startFaceRecognition = DateTime.MinValue;

  43:             }));

  44:         }

  45:     }

  46: }

Then change the invocation in [FaceTracking.xaml] use this routine and the result is as follows.

Now however, as there are too many points to display in a space so small, will apply a filter to only keypad points

var pointFilter = new List < int > {4, 8, 39, 41, 42, 48, 54, 68, 86, 74, 80, 57, 51};

the result is a little more sympathetic…

Saludos @ La Finca

El Bruno