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#include <OpenCV/OpenCV.h>
#include <cassert>
#include <iostream>
const char * WINDOW_NAME = "Face Tracker";
const CFIndex CASCADE_NAME_LEN = 2048;
char CASCADE_NAME[CASCADE_NAME_LEN] = "~/opencv/data/haarcascades/haarcascade_frontalface_alt2.xml";
using namespace std;
int main (int argc, char * const argv[])
{
const int scale = 2;
// locate haar cascade from inside application bundle
// (this is the mac way to package application resources)
CFBundleRef mainBundle = CFBundleGetMainBundle ();
assert (mainBundle);
CFURLRef cascade_url = CFBundleCopyResourceURL (mainBundle, CFSTR("haarcascade_frontalface_alt2"), CFSTR("xml"), NULL);
assert (cascade_url);
Boolean got_it = CFURLGetFileSystemRepresentation (cascade_url, true,
reinterpret_cast<UInt8 *>(CASCADE_NAME), CASCADE_NAME_LEN);
if (! got_it)
abort ();
// create all necessary instances
cvNamedWindow (WINDOW_NAME, CV_WINDOW_AUTOSIZE);
CvCapture * camera = cvCreateCameraCapture (CV_CAP_ANY);
CvHaarClassifierCascade* cascade = (CvHaarClassifierCascade*) cvLoad (CASCADE_NAME, 0, 0, 0);
CvMemStorage* storage = cvCreateMemStorage(0);
assert (storage);
// you do own an iSight, don't you ?!?
if (! camera)
abort ();
// did we load the cascade?!?
if (! cascade)
abort ();
// get an initial frame and duplicate it for later work
IplImage * current_frame = cvQueryFrame (camera);
IplImage * draw_image = cvCreateImage(cvSize (current_frame->width, current_frame->height), IPL_DEPTH_8U, 3);
IplImage * gray_image = cvCreateImage(cvSize (current_frame->width, current_frame->height), IPL_DEPTH_8U, 1);
IplImage * small_image = cvCreateImage(cvSize (current_frame->width / scale, current_frame->height / scale), IPL_DEPTH_8U, 1);
assert (current_frame && gray_image && draw_image);
// as long as there are images ...
while (current_frame = cvQueryFrame (camera))
{
// convert to gray and downsize
cvCvtColor (current_frame, gray_image, CV_BGR2GRAY);
cvResize (gray_image, small_image, CV_INTER_LINEAR);
// detect faces
CvSeq* faces = cvHaarDetectObjects (small_image, cascade, storage,
1.1, 2, CV_HAAR_DO_CANNY_PRUNING,
cvSize (30, 30));
// draw faces
cvFlip (current_frame, draw_image, 1);
for (int i = 0; i < (faces ? faces->total : 0); i++)
{
CvRect* r = (CvRect*) cvGetSeqElem (faces, i);
CvPoint center;
int radius;
center.x = cvRound((small_image->width - r->width*0.5 - r->x) *scale);
center.y = cvRound((r->y + r->height*0.5)*scale);
radius = cvRound((r->width + r->height)*0.25*scale);
cvCircle (draw_image, center, radius, CV_RGB(0,255,0), 3, 8, 0 );
}
// just show the image
cvShowImage (WINDOW_NAME, draw_image);
// wait a tenth of a second for keypress and window drawing
int key = cvWaitKey (100);
if (key == 'q' || key == 'Q')
break;
}
// be nice and return no error
return 0;
}
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