chubiao
/
yl-gzh


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

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

  <style>
  .demo-container {
    background-color: black;
  }

  video, canvas {
    position: absolute;
  }
  </style>
</head>
<body>
  <div class="demo-title">
    <p><a href="http://trackingjs.com" target="_parent">tracking.js</a> － detect certain colors in a video</p>
  </div>

  <div class="demo-frame">
    <div class="demo-container">
      <div id="rectangle"></div>
      <video id="video" width="800" height="530" preload autoplay loop muted controls>
        <source src="assets/minions.mp4" type="video/mp4">
        <source src="assets/minions.ogv" type="video/ogg">
      </video>
      <canvas id="canvas" width="800" height="500"></canvas>
    </div>
  </div>

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

      tracking.ColorTracker.registerColor('purple', function(r, g, b) {
        var dx = r - 120;
        var dy = g - 60;
        var dz = b - 210;

        if ((b - g) >= 100 && (r - g) >= 60) {
          return true;
        }
        return dx * dx + dy * dy + dz * dz < 3500;
      });

      var tracker = new tracking.ColorTracker(['yellow', 'purple']);
      tracker.setMinDimension(5);

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

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

        event.data.forEach(function(rect) {
          if (rect.color === 'custom') {
            rect.color = tracker.customColor;
          }

          context.strokeStyle = rect.color;
          context.strokeRect(rect.x, rect.y, rect.width, 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.x + rect.width + 5, rect.y + 22);
        });
      });

      initGUIControllers(tracker);
    };
  </script>

</body>
</html>