Haar-cascade Detection 얼굴 검출

It describes how to detect faces with Haar-cascade classifier.

OpenCV에서 Haar-cascade classifier를 이용한 얼굴 검출.

#include <opencv2/opencv.hpp>
 
using namespace std;
using namespace cv;
 
int main()
{
    Mat src = imread("girl.jpg");
 
    if (src.empty()) {
        cerr << "Image load failed." << endl;
 
        return -1;
    }
 
    CascadeClassifier classifier("haarcascade_frontalface_default.xml");
    // Cascade classifier class for object detection.
 
    if (classifier.empty()) {
        cerr << "Classifier load failed." << endl;
 
        return -1;
    }
 
    vector<Rect> faces;
    classifier.detectMultiScale(src, faces);
    // Detects objects of different sizes in the input image.
    // The detected objects are returned as a list of rectangles.
 
    for (Rect rect : faces) {
        rectangle(src, rect, Scalar(0, 0, 255), 2);
    }
 
    imshow("Face Detection", src);
 
    waitKey(0);
 
    return 0;
}

Run the program and see the result.

Detected two babies' faces.

It couldn't detect a face with shades and detected some wrong objects.