http://chikuyonok.ru/ambilight/

效果很震撼！有电影院的感觉了。呵呵。

看了下代码，依然是 在一个canvas里嵌入<video>然后getImageData

var canvas = document.createElement('canvas'),
    video = document.getElementsByTagName('video')[0],
    ctx = canvas.getContext('2d');
    ctx.drawImage(video, 0, 0, video.width, video.height);
var block_width = 50;
var pixels = ctx.getImageData(0, 0, block_width, canvas.height);

CPU在50%左右，那个Chrome内存占用在130MB到160MB之间徘徊