/* For description look into the help() function. */
#include "opencv2/objdetect.hpp"
#include "opencv2/highgui.hpp"
#include "opencv2/imgproc.hpp"#include <iostream>
using namespace std;
using namespace cv;/** Function Headers */
void detectAndDisplay(Mat frame);/** Global variables */
CascadeClassifier face_cascade;
CascadeClassifier eyes_cascade;/** @function main */
int main(int argc, const char** argv)
{
CommandLineParser parser(argc, argv,
"{help h||}"
"{face_cascade|F://opencv//VS_demo//opencvdemo//data//haarcascades//haarcascade_frontalface_alt.xml|Path to face cascade.}"
"{eyes_cascade|F://opencv//VS_demo//opencvdemo//data/haarcascades/haarcascade_eye_tree_eyeglasses.xml|Path to eyes cascade.}"
"{camera|0|Camera device number.}");parser.about("\nThis program demonstrates using the cv::CascadeClassifier class to detect objects (Face + eyes) in a video stream.\n"
"You can use Haar or LBP features.\n\n");
parser.printMessage();String face_cascade_name = parser.get<String>("face_cascade");
String eyes_cascade_name = parser.get<String>("eyes_cascade");//-- 1. Load the cascades
if (!face_cascade.load(face_cascade_name))
{
cout << "--(!)Error loading face cascade\n";
return -1;
};
if (!eyes_cascade.load(eyes_cascade_name))
{
cout << "--(!)Error loading eyes cascade\n";
return -1;
};int camera_device = parser.get<int>("camera");
VideoCapture capture;
//-- 2. Read the video stream
capture.open(camera_device);
if (!capture.isOpened())
{
cout << "--(!)Error opening video capture\n";
return -1;
}Mat frame;
while (capture.read(frame))
{
if (frame.empty())
{
cout << "--(!) No captured frame -- Break!\n";
break;
}//-- 3. Apply the classifier to the frame
detectAndDisplay(frame);if (waitKey(10) == 27)
{
break; // escape
}
}
return 0;
}/** @function detectAndDisplay */
void detectAndDisplay(Mat frame)
{
Mat frame_gray;
cvtColor(frame, frame_gray, COLOR_BGR2GRAY);
equalizeHist(frame_gray, frame_gray);//-- Detect faces
std::vector<Rect> faces;
face_cascade.detectMultiScale(frame_gray, faces);for (size_t i = 0; i < faces.size(); i++)
{
Point center(faces[i].x + faces[i].width / 2, faces[i].y + faces[i].height / 2);
ellipse(frame, center, Size(faces[i].width / 2, faces[i].height / 2), 0, 0, 360, Scalar(255, 0, 255), 4);Mat faceROI = frame_gray(faces[i]);
//-- In each face, detect eyes
std::vector<Rect> eyes;
eyes_cascade.detectMultiScale(faceROI, eyes);for (size_t j = 0; j < eyes.size(); j++)
{
Point eye_center(faces[i].x + eyes[j].x + eyes[j].width / 2, faces[i].y + eyes[j].y + eyes[j].height / 2);
int radius = cvRound((eyes[j].width + eyes[j].height)*0.25);
circle(frame, eye_center, radius, Scalar(255, 0, 0), 4);
}
}//-- Show what you got
imshow("Capture - Face detection", frame);
}
運行: