emgu.cv.cs

  var scale = 1.1;
  var minSamples = 4;
  var minSize = new Size(20, 20);
  var maxSize = new Size(ugray.Size.Width / 4, ugray.Size.Height / 4);
  var facesDetected = face.DetectMultiScale(
                      ugray,
                      scale,
                      minSamples,
                      minSize,
                      maxSize);