<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>Image Canny Example</title>
<link href="js_example_style.css" rel="stylesheet" type="text/css" />
</head>
<body>
<h2>Image Canny Example</h2>
<p>
    &lt;canvas&gt; elements named <b>canvasInput</b> and <b>canvasOutput</b> have been prepared.<br>
    Click <b>Try it</b> button to see the result. You can choose another image.<br>
    You can change the code in the &lt;textarea&gt; to investigate more.
</p>
<div>
<div class="control"><button id="tryI