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

using namespace cv;

int main(int argc, char* argv[])
{
    CascadeClassifier cascade;
    cascade.load("cascade.xml");

    cv::Mat img = cv::imread("imgUnseen.png",0);

    int i = 0;
    double t = 0;
    double xres=0.625, yres=0.625;
    vector<Rect> faces;

    //equalizeHist(img, img);
    vector<int> rejectLevels;
    vector<double> levelWeights;
    t = (double)cvGetTickCount();
    cascade.detectMultiScale( img, faces, rejectLevels, levelWeights, 1.1, 4, 0,
        Size(20/xres, 20/yres), Size(55/xres, 55/yres), true ); //sizes in mm
    t = (double)cvGetTickCount() - t;
    printf( "detection time = %g ms\n", t/((double)cvGetTickFrequency()*1000.) );
    printf( "detected objects = %d\n", faces.size());
    for( vector<Rect>::const_iterator r = faces.begin(); r != faces.end(); r++, i++ )
    {
        Point center;
        Scalar color = CV_RGB(255,255,255);
        int radius;
        center.x = cvRound((r->x + r->width*0.5));
        center.y = cvRound((r->y + r->height*0.5));
        radius = cvRound((r->width + r->height)*0.25);
        circle( img, center, radius, color, 3, 8, 0 );
    }
    cv::imshow( "result", img );

    cv::waitKey(0);
    return 0;
}