Face Detection

// Load the cascade
var haarCascade = new CascadeClassifier("haarcascade_frontalface_alt2.xml");

// Load target image
var gray = new Mat("faces.png", LoadMode.GrayScale);

// Detect faces
Rect[] faces = cascade.DetectMultiScale(
                    gray, 1.08, 2, HaarDetectionType.ScaleImage, new Size(30, 30));