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<html>
<head>
<title>Hand Tracking</title>
<script type="text/javascript" src="libs/polyfill.js"></script>
<script type="text/javascript" src="cv.js"></script>
<script type="text/javascript" src="handtracking.js"></script>
<script>
var DEMO = function(){
};
DEMO.prototype.start = function() {
var that = this;
this.tracker = new HT.Tracker();
this.cbxHull = document.getElementById("cbxHull");
this.cbxDefects = document.getElementById("cbxDefects");
this.cbxSkin = document.getElementById("cbxSkin");
this.video = document.getElementById("video");
this.canvas = document.getElementById("canvas");
this.context = this.canvas.getContext("2d");
this.canvas.width = parseInt(this.canvas.style.width);
this.canvas.height = parseInt(this.canvas.style.height);
this.image = this.context.createImageData(
this.canvas.width * 0.2, this.canvas.height * 0.2);
navigator.getUserMedia = navigator.getUserMedia || navigator.webkitGetUserMedia || navigator.mozGetUserMedia;
if (navigator.getUserMedia){
navigator.getUserMedia({video: true},
function(stream){ return that.videoReady(stream); },
function(error){ return that.videoError(error); } );
}
};
DEMO.prototype.videoReady = function(stream){
if (window.webkitURL) {
this.video.src = window.webkitURL.createObjectURL(stream);
} else if (video.mozSrcObject !== undefined) {
this.video.mozSrcObject = stream;
} else {
this.video.src = stream;
}
this.tick();
};
DEMO.prototype.videoError = function(error){
};
DEMO.prototype.tick = function(){
var that = this, image, candidate;
requestAnimationFrame( function() { return that.tick(); } );
if (this.video.readyState === this.video.HAVE_ENOUGH_DATA){
image = this.snapshot();
candidate = this.tracker.detect(image);
this.draw(candidate);
}
};
DEMO.prototype.snapshot = function(){
this.context.drawImage(this.video, 0, 0, this.canvas.width, this.canvas.height);
return this.context.getImageData(0, 0, this.canvas.width, this.canvas.height);
};
DEMO.prototype.draw = function(candidate){
if (candidate){
if (this.cbxHull.checked){
this.drawHull(candidate.hull, "red");
}
if (this.cbxDefects.checked){
this.drawDefects(candidate.defects, "blue");
}
}
if (this.cbxSkin.checked){
this.context.putImageData(
this.createImage(this.tracker.mask, this.image),
this.canvas.width - this.image.width,
this.canvas.height - this.image.height);
}
};
DEMO.prototype.drawHull = function(hull, color){
var len = hull.length, i = 1;
if (len > 0){
this.context.beginPath();
this.context.lineWidth = 3;
this.context.strokeStyle = color;
this.context.moveTo(hull[0].x, hull[0].y);
for (; i < len; ++ i){
this.context.lineTo(hull[i].x, hull[i].y);
}
this.context.stroke();
this.context.closePath();
}
};
DEMO.prototype.drawDefects = function(defects, color){
var len = defects.length, i = 0, point;
if (len > 0){
this.context.beginPath();
this.context.lineWidth = 3;
this.context.strokeStyle = color;
for (; i < len; ++ i){
point = defects[i].depthPoint;
this.context.strokeRect(point.x - 4, point.y - 4, 8, 8);
}
this.context.stroke();
this.context.closePath();
}
};
DEMO.prototype.createImage = function(imageSrc, imageDst){
var src = imageSrc.data, dst = imageDst.data,
width = imageSrc.width, span = 4 * width,
len = src.length, i = 0, j = 0, k = 0;
for(i = 0; i < len; i += span){
for(j = 0; j < width; j += 5){
dst[k] = dst[k + 1] = dst[k + 2] = src[i];
dst[k + 3] = 255;
k += 4;
i += 5;
}
}
return imageDst;
};
window.onload = function(){
var demo = new DEMO();
demo.start();
};
</script>
</head>
<body style="font-family: monospace;">
<center>
<div style="margin: 10px;"><strong>-= Hand Tracking =-</strong></div>
<video id="video" autoplay="true" style="display:none;"></video>
<canvas id="canvas" style="width:640px; height:480px;border:1px solid black;"></canvas>
<div style="margin: 15px;">
<input id="cbxHull" type="checkbox" checked="checked">Convex Hull</input>
<input id="cbxDefects" type="checkbox">Convexity Defects</input>
<input id="cbxSkin" type="checkbox" checked="checked">Skin Detection</input>
</div>
<div style="margin: 15px;"><strong>Powered by <a href="http://code.google.com/p/js-handtracking/" target="_blank">js-handtracking</a></strong></div>
</center>
</body>
</html>