opencv自带face-detection范例代码，编程实现人脸检测_opencv\face_detection_yunet.onnx

一、编码过程

1、调用摄像头

Mat frame;
VideoCapture capture(0);

2、读取人脸数据

CascadeClassifier stFaceCascade;
	if (!stFaceCascade.load("C:\\Users\\lenovo\\Downloads\\opencv\\opencv\\sources\\data\\lbpcascades\\lbpcascade_frontalface.xml"))
	{
		printf("Loading cascade error\n");
		return -1;
	}

VideoWriter writer("D:\\face.avi", CV_FOURCC('M', 'J', 'P', 'G'), 25.0, Size(640, 480));

4、视频处理

while (true)
	{
		capture >> frame;
		if (!frame.empty()) {
			//frame经过检测算法 
			IplImage* transIplimage = cvCloneImage(&(IplImage)frame);
			std::vector<Rect> faceRects;//矩形描绘
			stFaceCascade.detectMultiScale(transIplimage,
				faceRects,            //检