c++ OpenCV4 实现人脸检测face detect

代码：

#include <iostream>
#include <opencv2/core.hpp>
#include <opencv2/videoio.hpp>
#include <opencv2/highgui.hpp>
#include "opencv2/objdetect.hpp"
#include <opencv2/imgproc.hpp>

using namespace std;
using namespace cv;

void face_detect()
{
    Mat frame;
    VideoCapture cap;
    cap.open("http://ivi.bupt.edu.cn/hls/cctv2.m3u8");
    if (!cap.isOpened()) {
        cerr << "ERROR! Unable to open video\n";
        return;
    }
    double fps = cap.get(cv::CAP_PROP_FPS);
    cout << "fps = "<< fps <<endl;
    //获取cap视频流的每帧大小
    int width = cap.get(cv::CAP_PROP_FRAME_WIDTH);
    int height = cap.get(cv::CAP_PROP_FRAME_HEIGHT);
    cout<<"width = "<<width <<", height = "<<height<<endl;
    Size S(width, height);

    Scalar blue(255, 0, 0);
    CascadeClassifier classifier;
    classifier.load("./xml/haarcascade_frontalface_alt.xml");
    std::vector<Rect> detected_objects;
    int cnt = 0;
    for (;;)
    {
        cap.read(frame);
        if (frame.empty()) {
            cerr << "ERROR! blank frame grabbed\n";
            break;
        }
        if(cnt++ % 5 == 0)
        {           
            classifier.detectMultiScale( frame, detected_objects);
            for ( size_t i = 0; i < detected_objects.size(); i++ )
            {
                rectangle(frame, detected_objects[i], blue, 3);
            } 
        }

        imshow("Live", frame);
        if (waitKey(38) >= 0)
            break;
    }
}

运行结果：

./opencv-demo OpenCV4 Example.
OpenCV Version = 4.5.2
[NULL @ 0x556838ec4680] non-existing SPS 0 referenced in buffering period
[NULL @ 0x556838ec4680] SPS unavailable in decode_picture_timing
[h264 @ 0x556838eed000] non-existing SPS 0 referenced in buffering period
[h264 @ 0x556838eed000] SPS unavailable in decode_picture_timing
fps = 25
width = 720, height = 576
[h264 @ 0x55683916bfc0] error while decoding MB 30 33, bytestream -5
[h264 @ 0x556838f67040] error while decoding MB 23 1, bytestream -15
[h264 @ 0x556838fcca00] error while decoding MB 30 14, bytestream -11
[h264 @ 0x55683916bfc0] error while decoding MB 9 27, bytestream -9

运行效果：

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