Facial recognition issue

Question

Can some help me with this issue, have a facial recognition app but when my camera records an image of a person who is not in the database yet, the application still displays the name of a person I have added to the database... some code below i think the issue might be

 

 

if (isTrained) {
 Image < Gray, Byte > grayFaceResult = resultImage.Convert < Gray, Byte > ().Resize(200, 200, Inter.Cubic);
 CvInvoke.EqualizeHist(grayFaceResult, grayFaceResult);
 var result = recognizer.Predict(grayFaceResult);
 pictureBox1.Image = grayFaceResult.Bitmap;
 pictureBox2.Image = TrainedFaces[result.Label].Bitmap;
 Debug.WriteLine(result.Label + ". " + result.Distance);
 //Here results found known faces
 if (result.Label != -1 && result.Distance < 2000) {
  CvInvoke.PutText(currentFrame, PersonsNames[result.Label], new Point(face.X - 2, face.Y - 2),
   FontFace.HersheyComplex, 1.0, new Bgr(Color.Orange).MCvScalar);
  CvInvoke.Rectangle(currentFrame, face, new Bgr(Color.Green).MCvScalar, 2);
 }
 //here results did not found any know faces
 else {
  CvInvoke.PutText(currentFrame, "Unknown", new Point(face.X - 2, face.Y - 2),
   FontFace.HersheyComplex, 1.0, new Bgr(Color.Orange).MCvScalar);
  CvInvoke.Rectangle(currentFrame, face, new Bgr(Color.Red).MCvScalar, 2);

 }
}
private bool TrainImagesFromDir() {
  int ImagesCount = 0;
  double Threshold = 2000;
  TrainedFaces.Clear();
  PersonsLabes.Clear();
  PersonsNames.Clear();
  try {
   string path = Directory.GetCurrentDirectory() + @ "\TrainedImages";
   string[] files = Directory.GetFiles(path, "*.jpg", SearchOption.AllDirectories);

   foreach(var file in files) {
    Image < Gray, byte > trainedImage = new Image < Gray, byte > (file).Resize(200, 200, Inter.Cubic);
    CvInvoke.EqualizeHist(trainedImage, trainedImage);
    TrainedFaces.Add(trainedImage);
    PersonsLabes.Add(ImagesCount);
    string name = file.Split('\\').Last().Split('_')[0];
    PersonsNames.Add(name);
    ImagesCount++;
    Debug.WriteLine(ImagesCount + ". " + name);

   }

   if (TrainedFaces.Count() > 0) {
    // recognizer = new EigenFaceRecognizer(ImagesCount,Threshold);
    recognizer = new EigenFaceRecognizer(ImagesCount, Threshold);
    recognizer.Train(TrainedFaces.ToArray(), PersonsLabes.ToArray());

    isTrained = true;
    //Debug.WriteLine(ImagesCount);
    //Debug.WriteLine(isTrained);
    return true;
   } else {
    isTrained = false;
    return false;
   }
  } catch (Exception ex) {
   isTrained = false;
   MessageBox.Show("Error in Train Images: " + ex.Message);
   return false;
  }