相机视频流

西瓜皮儿 2023/9/15

<!DOCTYPE html>
<html>
<head>
  <title>局部相机</title>
  <style>
    #videoElement {
      width: 400px;
      height: 300px;
    }
    #canvas {
      display: none;
    }
  </style>
</head>
<body>
  <h1>局部相机示例</h1>
  <div id="cameraContainer">
    <video id="videoElement" autoplay></video>
    <button id="captureButton">拍照</button>
    <canvas id="canvas"></canvas>
  </div>

  <script>
    // 获取视频元素和拍照按钮
    const video = document.getElementById("videoElement");
    const captureButton = document.getElementById("captureButton");
    const canvas = document.getElementById("canvas");

    // 使用getUserMedia方法访问用户的摄像头
    navigator.mediaDevices.getUserMedia({ video: true })
      .then(function(stream) {
        // 将摄像头的视频流赋值给视频元素的srcObject属性
        video.srcObject = stream;
      })
      .catch(function(error) {
        console.log("访问摄像头失败:", error);
      });

    // 拍照按钮点击事件处理程序
    captureButton.addEventListener("click", function() {
      // 在canvas上绘制视频帧
      canvas.getContext("2d").drawImage(video, 0, 0, canvas.width, canvas.height);

      // 将canvas转换为图片URL并展示在页面上
      const imgUrl = canvas.toDataURL("image/png");
      const imgElement = document.createElement("img");
      imgElement.src = imgUrl;
      document.body.appendChild(imgElement);
    });
  </script>
</body>
</html>

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