PHP 및 OpenCV 라이브러리: 이미지에서 얼굴 표정 인식을 수행하는 방법은 무엇입니까?

sudo apt-get install libopencv-dev

sudo apt-get install php7.4-opencv

<?php
// 导入OpenCV和PHP扩展
use OpenCVHighgui{
    CV_LOAD_IMAGE_COLOR,
    imshow,
    waitKey
};
use OpenCV{CascadeClassifier, Mat};

// 加载人脸检测模型
$cascade = new CascadeClassifier();
$cascade->load('haarcascade_frontalface_default.xml');

// 加载表情识别模型
$recognizer = LBPHFaceRecognizer::create();
$recognizer->read('face_recognizer.yml');
$labels = ['Angry', 'Happy', 'Neutral', 'Sad'];

// 加载测试图像
$image = imread('test_image.jpg', CV_LOAD_IMAGE_COLOR);

// 转换图像为灰度
$gray = cvtColor($image, CV_BGR2GRAY);

// 检测人脸
$faces = [];
$cascade->detectMultiScale($gray, $faces);

// 对每个检测到的人脸进行表情识别
foreach ($faces as $face) {
    // 提取人脸
    $roi = $gray->submat($face);

    // 调整图像大小
    $resized = resize($roi, new Mat(100, 100));

    // 预测表情
    $label = 0;
    $confidence = 0;
    $recognizer->predict($resized, $label, $confidence);

    // 显示表情结果
    rectangle($image, $face->x, $face->y, $face->x + $face->width, $face->y + $face->height, Scalar::all(255));
    putText($image, $labels[$label], new Point($face->x, $face->y - 20), FONT_HERSHEY_SIMPLEX, 0.8, Scalar::all(255));
}

// 显示图像
imshow('Facial Expression Recognition', $image);
waitKey(0);

php facial_expression_recognition.php