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    <p>You can use HaarCascade class in EmguCV (DotNet port of OpenCV) <a href="http://www.emgu.com/wiki/index.php/Face_detection" rel="nofollow">http://www.emgu.com/wiki/index.php/Face_detection</a></p> <blockquote> <p>Notes in order to run this example:</p> <ul> <li>Create a Windows Form Application </li> <li>Add a PictureBox and a Timer (and Enable it) - Run it on a x86 system </li> <li>Be sure you have the OpenCV relevant dlls (included with the Emgu CV download) in the folder where you code executes. </li> <li>Adjust the path to find the Haarcascade xml (last line of the code)</li> </ul> </blockquote> <pre><code>using System; using System.Windows.Forms; using System.Drawing; using Emgu.CV; using Emgu.Util; using Emgu.CV.Structure; using Emgu.CV.CvEnum; namespace opencvtut { public partial class Form1 : Form { private Capture cap; private HaarCascade haar; public Form1() { InitializeComponent(); } private void timer1_Tick(object sender, EventArgs e) { using (Image&lt;Bgr, byte&gt; nextFrame = cap.QueryFrame()) { if (nextFrame != null) { // there's only one channel (greyscale), hence the zero index //var faces = nextFrame.DetectHaarCascade(haar)[0]; Image&lt;Gray, byte&gt; grayframe = nextFrame.Convert&lt;Gray, byte&gt;(); var faces = grayframe.DetectHaarCascade( haar, 1.4, 4, HAAR_DETECTION_TYPE.DO_CANNY_PRUNING, new Size(nextFrame.Width/8, nextFrame.Height/8) )[0]; foreach (var face in faces) { nextFrame.Draw(face.rect, new Bgr(0,double.MaxValue,0), 3); } pictureBox1.Image = nextFrame.ToBitmap(); } } } private void Form1_Load(object sender, EventArgs e) { // passing 0 gets zeroth webcam cap = new Capture(0); // adjust path to find your xml haar = new HaarCascade( "..\\..\\..\\..\\lib\\haarcascade_frontalface_alt2.xml"); } } } </code></pre> <p>Here is the sample I wrote <a href="http://www.overroot.com/blog/wp-content/uploads/2011/03/FaceRecognition.zip" rel="nofollow">http://www.overroot.com/blog/wp-content/uploads/2011/03/FaceRecognition.zip</a></p>
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