使用级联分类器实现人脸检测（OpenCV自带的数据）

 1 #include <opencv2/opencv.hpp>
 2 #include <iostream>
 3 
 4 using namespace cv;
 5 using namespace std;
 6 
 7 int main(int argc, char** argv) {
 8     String cascadeFilePath = "F:/CMake_bulid/install/etc/haarcascades/haarcascade_frontalface_alt.xml";//数据路径
 9     CascadeClassifier face_cascade;//创建分类器对象
10     if (!face_cascade.load(cascadeFilePath)) {
11         printf("could not load haar data...\n");
12         return -1;
13     }
14 
15     VideoCapture Capture(0);
16     Mat src, gray_src;
17     while(Capture.read(src)){    
18     
19         cvtColor(src, gray_src, COLOR_BGR2GRAY);
20         equalizeHist(gray_src, gray_src);//直方图均衡化        
21 
22         vector<Rect> faces;
23         face_cascade.detectMultiScale(gray_src, faces, 1.1, 2, 0, Size(30, 30));//多尺度查找
24         for (size_t t = 0; t < faces.size(); t++) {
25             rectangle(src, faces[t], Scalar(0, 0, 255), 2, 8, 0);
26         }
27         namedWindow("output", CV_WINDOW_AUTOSIZE);
28         imshow("output", src);
29 
30         uchar key = waitKey(100);
31         if(key==27)
32         {
33             break;
34         }
35 
36     }
37     waitKey(0);
38     return 0;
39 }