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sample_sobel.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="A JavaScript Computer Vision Library">
<meta name="author" content="Eugene Zatepyakin">
<title>JSFeat - JavaScript Computer Vision Library.</title>
<link rel="stylesheet" href="https://fonts.googleapis.com/css?family=Droid+Sans:regular,bold|Inconsolata|PT+Sans:400,700">
<link rel="stylesheet" href="css/bootstrap.css">
<link rel="stylesheet" href="css/jsfeat.css">
<script type="text/javascript">
var _gaq = _gaq || [];
_gaq.push(['_setAccount', 'UA-36419199-1']);
_gaq.push(['_trackPageview']);
(function() {
var ga = document.createElement('script'); ga.type = 'text/javascript'; ga.async = true;
ga.src = ('https:' == document.location.protocol ? 'https://ssl' : 'http://www') + '.google-analytics.com/ga.js';
var s = document.getElementsByTagName('script')[0]; s.parentNode.insertBefore(ga, s);
})();
</script>
</head>
<body>
<video id="webcam" width="640" height="480" style="display:none;"></video>
<div style=" width:640px;height:480px;margin: 10px auto;">
<canvas id="canvas" width="640" height="480"></canvas>
<div id="no_rtc" class="alert alert-error" style="display:none;"></div>
<div id="log" class="alert alert-info"></div>
</div>
<script type="text/javascript" src="https://ajax.googleapis.com/ajax/libs/jquery/1.8.2/jquery.min.js"></script>
<script type="text/javascript" src="js/jsfeat-min.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).load(function() {
"use strict";
// lets do some fun
var video = document.getElementById('webcam');
var canvas = document.getElementById('canvas');
try {
var attempts = 0;
var readyListener = function(event) {
findVideoSize();
};
var findVideoSize = function() {
if(video.videoWidth > 0 && video.videoHeight > 0) {
video.removeEventListener('loadeddata', readyListener);
onDimensionsReady(video.videoWidth, video.videoHeight);
} else {
if(attempts < 10) {
attempts++;
setTimeout(findVideoSize, 200);
} else {
onDimensionsReady(640, 480);
}
}
};
var onDimensionsReady = function(width, height) {
demo_app(width, height);
compatibility.requestAnimationFrame(tick);
};
video.addEventListener('loadeddata', readyListener);
compatibility.getUserMedia({video: true}, function(stream) {
try {
video.src = compatibility.URL.createObjectURL(stream);
} catch (error) {
video.srcObject = stream;
}
setTimeout(function() {
video.play();
}, 500);
}, function (error) {
$('#canvas').hide();
$('#log').hide();
$('#no_rtc').html('<h4>WebRTC not available.</h4>');
$('#no_rtc').show();
});
} catch (error) {
$('#canvas').hide();
$('#log').hide();
$('#no_rtc').html('<h4>Something goes wrong...</h4>');
$('#no_rtc').show();
}
var stat = new profiler();
var ctx,canvasWidth,canvasHeight;
var img_u8,img_gxgy;
function demo_app(videoWidth, videoHeight) {
canvasWidth = canvas.width;
canvasHeight = canvas.height;
ctx = canvas.getContext('2d');
ctx.fillStyle = "rgb(0,255,0)";
ctx.strokeStyle = "rgb(0,255,0)";
img_u8 = new jsfeat.matrix_t(640, 480, jsfeat.U8C1_t);
img_gxgy = new jsfeat.matrix_t(640, 480, jsfeat.S32C2_t);
stat.add("grayscale");
stat.add("sobel");
}
function tick() {
compatibility.requestAnimationFrame(tick);
stat.new_frame();
if (video.readyState === video.HAVE_ENOUGH_DATA) {
ctx.drawImage(video, 0, 0, 640, 480);
var imageData = ctx.getImageData(0, 0, 640, 480);
stat.start("grayscale");
jsfeat.imgproc.grayscale(imageData.data, 640, 480, img_u8);
stat.stop("grayscale");
stat.start("sobel");
jsfeat.imgproc.sobel_derivatives(img_u8, img_gxgy);
stat.stop("sobel");
// render result back to canvas
var data_u32 = new Uint32Array(imageData.data.buffer);
var alpha = (0xff << 24);
var i = img_u8.cols*img_u8.rows, pix=0, gx = 0, gy = 0;
while(--i >= 0) {
gx = Math.abs(img_gxgy.data[i<<1]>>2)&0xff;
gy = Math.abs(img_gxgy.data[(i<<1)+1]>>2)&0xff;
pix = ((gx + gy)>>1)&0xff;
data_u32[i] = (pix << 24) | (gx << 16) | (0 << 8) | gy;
}
ctx.putImageData(imageData, 0, 0);
$('#log').html(stat.log());
}
}
$(window).unload(function() {
video.pause();
video.src=null;
});
});
</script>
</body>
</html>