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HTML5 canvas实时绘画摄像头数据

2016-12-02 19:08 393 查看

第一篇博客：HTML5 canvas实时绘画摄像头数据

拷贝代码会发现有两个视图块，左边是video呈现的，右边是canvas用定时器截取到video流一帧帧画出来的

<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width,initial-scale=1,maximum-scale=1,user-scalable=no">
<title>html5 调用本地摄像头</title>
</head>
<body>
<video id="video" autoplay="autoplay" style="background: #ccc;"></video>
<canvas id="canvas">1212</canvas>
<script type="text/javascript">
var video = document.getElementById("video");
var context = canvas.getContext("2d");
var errocb = function (code) {
alert(code);
};
if (navigator.getUserMedia) { // 标准的API
navigator.getUserMedia({ "video": true }, function (stream) {
video.src = stream;
video.play();
}, errocb);
} else if (navigator.webkitGetUserMedia) { // WebKit 核心的API

console.log(navigator.webkitGetUserMedia);
navigator.webkitGetUserMedia({ "video": true }, function (stream) {

video.src = window.webkitURL.createObjectURL(stream);
video.play();
}, errocb);
}

window.setInterval(function(){
context.drawImage(video, 0, 0, 375, 180);
},15);

</script>
<style type="text/css">
html,body{
position: relative;
width: 100%;
height: 100%;
padding: 0px;
margin: 0px;
}
video{
width: 30%;
height: 30%;
}
canvas{
width: 30%;
height: 30%;
position: absolute;
left: 200px;
top: 0px;
z-index: 100;
}
</style>
</body>
</html>

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标签： html5 摄像头 canvas 数据

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