I have used face cascade to tracking face through webcame. And loop function is very fast if image from camera contains face. However, if not, it is very slow.
My source:
void camera() {
String face_cascade_name = "haarcascade_frontalface_alt.xml";
String eye_cascade_name = "haarcascade_eye.xml";
CascadeClassifier face_cascade;
CascadeClassifier eyes_cascade;
String window_name = "Capture - Face detection";
VideoCapture cap(0);
if (!face_cascade.load(face_cascade_name)) {
printf("--(!)Error loading\n");
};
if (!eyes_cascade.load(eye_cascade_name)) {
printf("--(!)Error loading\n");
};
if (!cap.isOpened()) {
cerr << "Capture Device ID " << 0 << "cannot be opened." << endl;
} else {
Mat frame;
vector<Rect> faces;
vector<Rect> eyes;
for (;;) {
cap.read(frame);
Mat original = frame.clone();
Mat frame_gray;
cvtColor(original, frame_gray, CV_BGR2GRAY);
equalizeHist(frame_gray, frame_gray);
face_cascade.detectMultiScale(frame_gray, faces, 1.1, 2,
CASCADE_FIND_BIGGEST_OBJECT | CASCADE_DO_ROUGH_SEARCH,
Size(30, 30));
if (faces.size() > 0) {
rectangle(original, faces[0], Scalar(0, 0, 255), 2, 8, 0);
Mat face = frame_gray(faces[0]);
eyes_cascade.detectMultiScale(face, eyes, 1.1, 2,
0 | CASCADE_SCALE_IMAGE, Size(30, 30));
Mat veFace = original(faces[0]);
for (int i = 0; i < eyes.size(); i++) {
rectangle(veFace, eyes[i], Scalar(255, 0, 255), 2, 8, 0);
}
namedWindow(window_name, CV_WINDOW_AUTOSIZE);
imshow(window_name, original);
}
if (waitKey(30) == 27) {
cout << "esc key is pressed by user" << endl;
break;
}
}
}}
How can i produce that time, please help me.
