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step3.html
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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>监控系统</title>
</head>
<body>
<video width="640" height="480" autoplay></video>
<canvas width="640" height="480"></canvas>
<script>
var video = document.querySelector('video');
var canvas = document.querySelector('canvas');
// video捕获摄像头画面
navigator.webkitGetUserMedia({
video: true
}, success, error);
function success(stream) {
video.src = window.URL.createObjectURL(stream);
video.play();
}
function error(err) {
alert('video error: ' + err)
}
//canvas
var context = canvas.getContext('2d');
var preFrame, //前一帧
curFrame; //当前帧
//捕获并保存帧内容
function captureAndSaveFrame(){
preFrame = curFrame;
context.drawImage(video, 0, 0, 640, 480);
curFrame = canvas.toDataURL(); //转为base64并保存
}
//定时捕获
function timer(delta){
setTimeout(function(){
captureAndSaveFrame();
timer(delta)
}, delta || 500);
}
timer();
</script>
</body>
</html>