C++ で顔認識と顔検出を行うにはどうすればよいですか?

#include <opencv2/opencv.hpp>
#include <opencv2/objdetect.hpp>

int main()
{
    cv::CascadeClassifier faceDetector;
    faceDetector.load("haarcascade_frontalface_default.xml"); // 加载人脸检测器模型

    cv::Mat image = cv::imread("image.jpg");

    std::vector<cv::Rect> faces;
    faceDetector.detectMultiScale(image, faces, 1.1, 3, 0, cv::Size(50, 50));

    for (const auto& face : faces)
    {
        cv::rectangle(image, face, cv::Scalar(0, 0, 255), 2);
    }

    cv::imshow("Face Detection", image);
    cv::waitKey(0);

    return 0;
}

#include <opencv2/opencv.hpp>
#include <opencv2/face.hpp>

int main()
{
    cv::Ptr<cv::face::LBPHFaceRecognizer> faceRecognizer = cv::face::createLBPHFaceRecognizer();

    std::vector<cv::Mat> images;
    std::vector<int> labels;

    images.push_back(cv::imread("image1.jpg", cv::IMREAD_GRAYSCALE));
    labels.push_back(0); // 第一张图像的标签为0
    images.push_back(cv::imread("image2.jpg", cv::IMREAD_GRAYSCALE));
    labels.push_back(1); // 第二张图像的标签为1

    faceRecognizer->train(images, labels); // 训练人脸识别器

    cv::Mat testImage = cv::imread("test.jpg", cv::IMREAD_GRAYSCALE);
    int predictedLabel = faceRecognizer->predict(testImage); // 对测试图像进行识别

    cv::imshow("Test Image", testImage);
    cv::waitKey(0);

    return 0;
}