tracking.js實現前端人臉識別功能

阿新 • • 發佈：2020-04-19

1.下載

https://trackingjs.com/

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2.執行例子

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納總一下

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發現效果

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裡面的程式碼為

<!doctype html>
<html>
<head>
 <meta charset="utf-8">
 <title>tracking.js - face hello world</title>
 <link rel="stylesheet" href="assets/demo.css" rel="external nofollow" rel="external nofollow" >

 <script src="build/tracking-min.js"></script>
 <script src="build/data/face-min.js"></script>
 <script src="build/data/eye-min.js"></script>
 <script src="build/data/mouth-min.js"></script>

 <style>
 .rect {
  border: 2px solid #a64ceb;
  left: -1000px;
  position: absolute;
  top: -1000px;
 }

 #img {
  position: absolute;
  top: 50%;
  left: 50%;
  margin: -173px 0 0 -300px;
 }
 </style>
</head>
<body>
 <!-- <div class="demo-title">
  <p><a href="http://trackingjs.com" rel="external nofollow" target="_parent">tracking.js</a> － detect faces,eyes and mouths in a image</p>
 </div>
 -->
 <!-- <div class="demo-frame"> -->
  <div class="demo-container">
   <img id="img" src="
   http://img3.imgtn.bdimg.com/it/u=2939771753,2928311039&fm=214&gp=0.jpg
   " />
  </div>
<!--  </div> -->

 <script>
  window.onload = function() {
   var img = document.getElementById('img');

   var tracker = new tracking.ObjectTracker(['face','eye','mouth']);
   tracker.setStepSize(1.7);

   tracking.track('#img',tracker);

   tracker.on('track',function(event) {
    event.data.forEach(function(rect) {
     window.plot(rect.x,rect.y,rect.width,rect.height);
    });
   });

   window.plot = function(x,y,w,h) {
    var rect = document.createElement('div');
    document.querySelector('.demo-container').appendChild(rect);
    rect.classList.add('rect');
    rect.style.width = w + 'px';
    rect.style.height = h + 'px';
    rect.style.left = (img.offsetLeft + x) + 'px';
    rect.style.top = (img.offsetTop + y) + 'px';
   };
  };
 </script>

</body>
</html>

這裡要注意，人臉必須是解決跨域了的，讀取本地圖片可能會包跨域問題

讀取攝像頭

<!doctype html>
<html>
<head>
 <meta charset="utf-8">
 <title>tracking.js - face with camera</title>
 <link rel="stylesheet" href="assets/demo.css" rel="external nofollow" rel="external nofollow" >

 <script src="build/tracking-min.js"></script>
 <script src="build/data/face-min.js"></script>
  <script src="node_modules/dat.gui/build/dat.gui.min.js"></script>
 <script src="assets/stats.min.js"></script>

 <style>
 video,canvas {
  margin-left: 230px;
  margin-top: 120px;
  position: absolute;
 }
 </style>
</head>
<body>
 <div class="demo-frame">
  <div class="demo-container">
   <video id="video" width="320" height="240" preload autoplay loop muted></video>
   <canvas id="canvas" width="320" height="240"></canvas>
  </div>
 </div>

 <script>
  window.onload = function() {
   var video = document.getElementById('video');
   var canvas = document.getElementById('canvas');
   var context = canvas.getContext('2d');

   var tracker = new tracking.ObjectTracker('face');
   tracker.setInitialScale(4);
   tracker.setStepSize(2);
   tracker.setEdgesDensity(0.1);

   tracking.track('#video',tracker,{ camera: true });

   tracker.on('track',function(event) {
    context.clearRect(0,canvas.width,canvas.height);

    event.data.forEach(function(rect) {
     context.strokeStyle = '#a64ceb';
     context.strokeRect(rect.x,rect.height);
     context.font = '11px Helvetica';
     context.fillStyle = "#fff";
     context.fillText('x: ' + rect.x + 'px',rect.x + rect.width + 5,rect.y + 11);
     context.fillText('y: ' + rect.y + 'px',rect.y + 22);
    });
   });

   var gui = new dat.GUI();
   gui.add(tracker,'edgesDensity',0.1,0.5).step(0.01);
   gui.add(tracker,'initialScale',1.0,10.0).step(0.1);
   gui.add(tracker,'stepSize',1,5).step(0.1);
  };
 </script>

</body>
</html>

總結

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