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part17d_motion_detection_scaled.html
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part17d_motion_detection_scaled.html
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<!DOCTYPE html>
<html>
<title>Creative Coding Yea!</title>
<head>
<meta charset="utf-8">
<script language="javascript" src="js/creative_coding.js"></script>
<script language="javascript" src="js/canvas.js"></script>
<script language="javascript" src="js/video.js"></script>
<link rel="stylesheet" href="css/reset.css" type="text/css" media="screen" />
<link rel="stylesheet" href="css/style.css" type="text/css" media="screen" />
</head>
<body>
<script>
var ctx = createCanvas("canvas1");
var old = [];
var threshold = 10;
var scalefactor = 40;
function setup(){
video.width = w/scalefactor;
video.height = h/scalefactor;
}
function draw(){
ctx.drawImage(video, 0, 0, video.width, video.height);
var data = ctx.getImageData(0, 0, video.width, video.height).data;
for (var y = 0; y < video.height; y++) {
for (var x = 0; x < video.width; x++) {
var pos = (x + y * video.width) * 4;
var r = data[pos];
var g = data[pos+1];
var b = data[pos+2];
if(old[pos] && Math.abs(old[pos].red - r) > threshold) {
ctx.fillStyle = rgb(r, g, b);
ctx.fillRect(x * scalefactor, y * scalefactor, scalefactor, scalefactor);
}
old[pos] = { red: r, green: g, blue: b};
}
}
}
</script>
</body>
</html>