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index.html
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<!doctype html>
<html lang="en">
<head>
<meta charset="utf-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge,chrome=1">
<meta name="description" content="Delaunay Triangulation applied on WebCam stream">
<meta name="author" content="David Corvoysier">
<title>Delaunay Triangulation applied on WebCam stream".</title>
<link rel="stylesheet" href="http://fonts.googleapis.com/css?family=Droid+Sans:regular,bold|Inconsolata|PT+Sans:400,700">
</head>
<body>
<div style=" width:640px;height:480px;margin: 10px auto;position: relative;">
<!--<img id="webcam" width="640" height="480" src="webcam.png"></img>-->
<video id="webcam" width="640" height="480"></video>
<canvas id="grid" width="640" height="480" style="position: absolute;top:0px;left:0px;"></canvas>
<div id="log" class="alert alert-info"></div>
<canvas id="canvas" style="visibility: hidden"></canvas>
</div>
<script type="text/javascript" src="jsfeat/build/jsfeat-min.js"></script>
<script type="text/javascript" src="dat-gui/build/dat.gui.min.js"></script>
<script type="text/javascript" src="delaunay/delaunay.js"></script>
<script type="text/javascript" src="prefixfree/prefixfree.js"></script>
<script type="text/javascript" src="js/compatibility.js"></script>
<script type="text/javascript" src="js/profiler.js"></script>
<script type="text/javascript">
window.addEventListener("load",function() {
var video = document.getElementById('webcam');
var canvas = document.getElementById('canvas');
var grid = document.getElementById('grid');
var log = document.getElementById('log');
try {
compatibility.getUserMedia({video: true}, function(stream) {
try {
video.src = compatibility.URL.createObjectURL(stream);
} catch (error) {
video.src = stream;
}
setTimeout(function() {
video.play();
demo_app();
compatibility.requestAnimationFrame(tick);
}, 500);
}, function (error) {
log.innerHTML = '<h4>Unable to get access to your WebCam.</h4>';
});
} catch (error) {
log.innerHTML = '<h4>Fatal Error.</h4>';
}
var stat = new profiler();
var gui,options,ctx,gridCtx;
var img_u8, corners, threshold;
var demo_opt = function(){
this.threshold = 5;
this.resolution = 0.5;
this.draw_borders = false;
}
function demo_app() {
options = new demo_opt();
gui = new dat.GUI();
gui.add(options, 'threshold', 5, 100).step(1);
var setResolution = function(resolution) {
var cwidth = Math.floor(640*resolution);
var cheight = Math.floor(480*resolution);
img_u8 = new jsfeat.matrix_t(cwidth, cheight, jsfeat.U8_t | jsfeat.C1_t);
canvas.width = cwidth;
canvas.height = cheight;
var style = 'visibility: hidden;transform:scale('+1/resolution+')';
canvas['style'] = PrefixFree.prefixCSS(style);
gridCtx.setTransform(1/resolution,0,0,1/resolution,0,0);
corners = [];
var i = cwidth*cheight;
while(--i >= 0) {
corners[i] = new jsfeat.point2d_t(0,0,0,0);
corners[i].triangles = [];
}
}
var resctl = gui.add(options, 'resolution', 0.1, 1.0).step(0.1);
resctl.onFinishChange(function(value){
setResolution(value);
});
gui.add(options, 'draw_borders');
stat.add("capture");
stat.add("grayscale");
stat.add("fast corners");
stat.add("triangles");
stat.add("rendering");
ctx = canvas.getContext('2d');
gridCtx = grid.getContext('2d');
setResolution(options.resolution);
jsfeat.fast_corners.set_threshold(options.threshold);
}
function tick() {
compatibility.requestAnimationFrame(tick);
stat.new_frame();
if (video.readyState === video.HAVE_ENOUGH_DATA) {
var cwidth = Math.floor(640*options.resolution);
var cheight = Math.floor(480*options.resolution);
stat.start("capture");
ctx.drawImage(video, 0, 0, cwidth, cheight);
var imageData = ctx.getImageData(0, 0, cwidth, cheight);
stat.stop("capture");
stat.start("grayscale");
jsfeat.imgproc.grayscale(imageData.data, img_u8.data);
stat.stop("grayscale");
if(options.equalize_histogram){
stat.start("equalize histogram");
jsfeat.imgproc.equalize_histogram(img_u8, img_u8);
stat.stop("equalize histogram");
}
if(threshold != options.threshold) {
threshold = options.threshold|0;
jsfeat.fast_corners.set_threshold(threshold);
}
stat.start("fast corners");
var count = jsfeat.fast_corners.detect(img_u8, corners, 5);
stat.stop("fast corners");
stat.start("triangles");
var vertices = [{x:0,y:0},{x:cwidth,y:0},{x:cwidth,y:cheight},{x:0,y:cheight}];
for(var i=0;i<count;i++) {
vertices.push(corners[i]);
}
var triangles = triangulate(vertices);
stat.stop("triangles");
var getTriangleColor = function (img,triangle) {
var getColor = function (point) {
var offset = (point.x+point.y*cwidth)*4;
return { r:img.data[offset],
g:img.data[offset+1],
b:img.data[offset+2] };
}
var midPoint = function (point1,point2) {
return {x:(point1.x+point2.x)/2,
y:(point1.y+point2.y)/2};
}
// Pick a point inside the triangle
var point1 = midPoint(triangle.a,triangle.b);
var point = midPoint(point1,triangle.c);
return getColor({x:Math.floor(point.x),y:Math.floor(point.y)});
}
stat.start("rendering");
for(var i=0;i<triangles.length;i++) {
var color = triangles[i].color = getTriangleColor(imageData,triangles[i]);
gridCtx.fillStyle = 'rgb('+
color.r+','+
color.g+','+
color.b+')';
gridCtx.beginPath();
gridCtx.moveTo(triangles[i].a.x,triangles[i].a.y);
gridCtx.lineTo(triangles[i].b.x,triangles[i].b.y);
gridCtx.lineTo(triangles[i].c.x,triangles[i].c.y);
gridCtx.closePath();
if(options.draw_borders) {
gridCtx.strokeStyle = 'black';
gridCtx.stroke();
}
gridCtx.fill();
}
stat.stop("rendering");
log.innerHTML = stat.log();
}
}
},false);
</script>
</body>
</html>