使用 Affectiva JS SDK 的错误（帧检测器模式）

Question

我在使用 Affectiva (http://developer.affectiva.com/v3_1/javascript/analyze-frames/), specifically in Frame Detector mode. I had no trouble getting the CameraFeed version up & running, they even have a nice example on JSFiddle (https://jsfiddle.net/affectiva/opyh5e8d/show/) 的新 JS SDK 时遇到问题。但是 Frame Detector 模式只从 Web Worker 给了我数百个 "runtime errors"。

<body class='session'>
  <div class='col-md-8' id='affdex_elements' style='width:680px;height:480px;'>
    <video autoplay id='video'></video>
    <canvas id='canvas'></canvas>
  </div>
  <div id='results' style='word-wrap:break-word;'></div>
  <div id='logs'></div>

  <script src="https://download.affectiva.com/js/3.1/affdex.js"></script>
  <script>
    var width = 640;
    var height = 480;

    var faceMode = affdex.FaceDetectorMode.LARGE_FACES;
    var detector = new affdex.FrameDetector(faceMode);

  detector.addEventListener("onInitializeSuccess", function() {
    console.log('Detector reports initialized.');

    // Start with first capture...
    captureImage();
  });

  detector.addEventListener("onImageResultsSuccess", function (faces, image, timestamp) {
    console.log( faces );
    captureImage();
  });

  detector.addEventListener("onImageResultsFailure", function (image, timestamp, err_detail) {
    console.log( err_detail );
    captureImage();
  });

  detector.detectAllExpressions();
  detector.detectAllEmotions();
  detector.detectAllEmojis();
  detector.detectAllAppearance();

  detector.start();

  var v = document.getElementById('video');
  var c = document.getElementById('canvas');
  var t = c.getContext('2d');
  c.width = width;
  c.height = height;  

  navigator.getUserMedia = navigator.getUserMedia || navigator.webkitGetUserMedia ||  
    navigator.mozGetUserMedia || navigator.msGetUserMedia || navigator.oGetUserMedia;

  if (navigator.getUserMedia) {       
      navigator.getUserMedia({video: true}, handleVideo, videoError);
  }
  function handleVideo(stream) { v.src = window.URL.createObjectURL(stream); }
  function videoError(e) { console.log( e ); }

  function captureImage() {
    console.log('Capturing...');
    t.clearRect( 0, 0, c.width, c.height );
    t.drawImage( v, 0, 0, width, height );
    var imgData = t.getImageData(0, 0, c.width, c.height);
    var currentTimeStamp = ( new Date() ).getTime() / 1000;
    detector.process( imgData, currentTimeStamp );
  }
</script>

为了得到一个简单的工作示例，我删除了所有非必要的内容。同样，我对这个的 CameraFeed 版本没有问题运行。只是这个不起作用。我错过了什么傻事吗？文档有点轻...

Answer 1

在内部，时间戳被转换为整数进行存储。我认为你可能运行进入整数溢出。您能否缓存初始时间戳，并从后续时间戳中减去它，以便传递给 process() 的第一个时间戳为 0，然后后续值增加幅度。

使用 Affectiva JS SDK 的错误（帧检测器模式）

Errors using Affectiva JS SDK (Frame Detector Mode)

javascript

canvas

html5-canvas

affdex-sdk