Face detection using webcam

Example:

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#include "opencv2/objdetect/objdetect.hpp"
#include "opencv2/highgui/highgui.hpp"
#include "opencv2/imgproc/imgproc.hpp"
#include <iostream>

using namespace cv;
using namespace std;

int main()
{
 Mat image;
 CvCapture* capture;
     
    // Read the video stream
    capture = cvCaptureFromCAM( -1 );  
 
    // Load Face cascade (.xml file)
    CascadeClassifier face_cascade;
    face_cascade.load( "C:/OpenCV243/data/Haarcascades/haarcascade_frontalface_alt2.xml" );

 while(1)
 {
 image = cvQueryFrame( capture );
    // Detect faces
    std::vector<Rect> faces;
    face_cascade.detectMultiScale( image, faces, 1.1, 2, 0|CV_HAAR_SCALE_IMAGE, Size(30, 30) );

 
    // Draw circles on the detected faces
    for( int i = 0; i < faces.size(); i++ )
    {
        Point center( faces[i].x + faces[i].width*0.5, faces[i].y + faces[i].height*0.5 );
        ellipse( image, center, Size( faces[i].width*0.5, faces[i].height*0.5), 0, 0, 360, Scalar( 255, 0, 255 ), 4, 8, 0 );
    }
     
    imshow( "Detected Face", image );
 waitKey(10); 
 }
        
    waitKey(0);
}

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