如何使用face-api在用户高兴和人脸检测时拍摄图像

navigator.mediaDevices.getUserMedia({ video: true })
  .then(stream => {
    const videoElement = document.getElementById('video');
    videoElement.srcObject = stream;
  })
  .catch(error => {
    console.error('Error accessing camera:', error);
  });

const videoElement = document.getElementById('video');
const canvasElement = document.getElementById('canvas');
const displaySize = { width: videoElement.width, height: videoElement.height };

faceapi.matchDimensions(canvasElement, displaySize);

setInterval(async () => {
  const detections = await faceapi.detectAllFaces(videoElement, new faceapi.TinyFaceDetectorOptions()).withFaceExpressions();
  const happyDetections = detections.filter(detection => detection.expressions.happy > 0.5);

  if (happyDetections.length > 0) {
    // 用户高兴时的处理逻辑
    const canvasContext = canvasElement.getContext('2d');
    canvasContext.drawImage(videoElement, 0, 0, displaySize.width, displaySize.height);
    const imageDataURL = canvasElement.toDataURL('image/jpeg');
    // 将图像数据发送到服务器或进行其他处理
  }
}, 100);