从实时网络摄像头流中查找人脸的偏航角、侧倾角和俯仰角

我需要从一张脸的网络摄像头流中找到偏航、侧倾和俯仰角度。我使用opencv获取人脸标记并检测人脸。有人能帮助或指导我如何找到并打印这些角度吗? 我正在使用VisualStudio2022(社区)。

Ptr<Facemark> facemark; //mark detection
CascadeClassifier faceDetector; //face detection

void process(Mat img, Mat imgcol) {
    vector<Rect> faces;
    faceDetector.detectMultiScale(img, faces);
    Mat imFace;
    if (faces.size() != 0) {
        for (size_t i = 0; i < faces.size(); i++)
        {
            cv::rectangle(imgcol, faces[i], Scalar(255, 0, 0));
            imFace = imgcol(faces[i]);
            resize(imFace, imFace, Size(imFace.cols * 5, imFace.rows * 5));
            faces[i] = Rect(faces[i].x = 0, faces[i].y = 0, faces[i].width * 5,
                (faces[i].height) * 5);
        }
        vector< vector<Point2f> > shapes;
        if (facemark->fit(imFace, faces, shapes))   
        {
            for (unsigned long i = 0; i < faces.size(); i++) {
                for (unsigned long k = 0; k < shapes[i].size(); k++) {
                    cv::circle(imFace, shapes[i][k], 5, cv::Scalar(0, 0, 255),FILLED);
                }
            }
        }
        namedWindow("Detected_shape");
        imshow("Detected_shape", imFace);
        waitKey(5);
    }

    else {
        cout << "Faces not detected." << endl;
    }

}

int main()
{
    facemark = FacemarkLBF::create();
    facemark->loadModel("lbfmodel.yml");
    faceDetector.load("D:/opencv/build/install/etc/haarcascades/haarcascade_frontalface_alt2.xml");
    cout << "Loaded model" << endl;

    VideoCapture cap(1);  //capture image
    int initialized = 0;

    for (;;)
    {
        if (!cap.isOpened()) {
           cout << "Video Capture Fail" << endl;
            break;
        }

        else {
            Mat img;   //image containers
            Mat imgbw;
            cap >> img;   //image from webcam

            resize(img, img, Size(460, 460), 0, 0, INTER_LINEAR_EXACT);
            cvtColor(img, imgbw, COLOR_BGR2GRAY);
            process(imgbw, img);
            namedWindow("Live", WINDOW_AUTOSIZE);
            imshow("Live", img);
            waitKey(5);
        }
    }
}

代码包括到目前为止我能做的事情。它检测人脸和地标。我如何找到角度并从中打印出来?