canvas像素点操作之视频绿幕抠图

本文介绍了canvas像素点操作之视频绿幕抠图，分享给大家，具体如下：

用法：

context.putImageData(imgData, x, y, dX, dY, dWidth, dHeight);

该栗子纯属为了演示功能而做，如果只强调效果而不在乎数据的话，用CSS3的filter属性便能高效又轻松地搞定。

部分代码

import imgUrl from &＃39;./component/sample.jpg&＃39;;

export default {
	data () {
		return {
			imgUrl: imgUrl
		}
	},

	methods: {
		onOperate1 () {
			this.ctx.putImageData(this.onCompute1(), 0, 0);
		},

		onOperate2 () {
			this.ctx.putImageData(this.onCompute2(), 0, 0);
		},

		...

		onCancel () {
			this.reload();
		},

		onCompute1 () {
			let data = this.frameData.data;

	        for (let i = 0; i 
上周跟同学去了一趟溧阳天目湖的南山竹海，在景区被忽悠拍了一张照片，就是这张 ——
部分代码
import videoUrl from &＃39;./component/video.ogv&＃39;;
import imgUrl from &＃39;./component/sample.jpg&＃39;;

const TOLERANCE = 5;
export default {
	data () {
		return {
			videoUrl: videoUrl,
			imgUrl: imgUrl
		}
	},

	methods: {
		draw () {
			if (this.video.paused || this.video.ended) {
	          	return;
	        }
			this.ctx.drawImage(this.video, 0, 0, this.width, this.height);
			this.ctx.putImageData(this.cutOut(), 0, 0);
		},

		cutOut () {
			let frameData = this.ctx.getImageData(0, 0, this.width, this.height),
				len = frameData.data.length / 4;

	        for (let i = 0; i = TOLERANCE 
	          	 && g - 100 >= TOLERANCE 
	          	 && b - 43 <= TOLERANCE) {
		            frameData.data[i * 4 + 3] = 0;
	          	}
	        }
	        return frameData;
		}
	},

	mounted () {
		this.video = this.$refs[&＃39;video&＃39;];
        this.canvas = this.$refs[&＃39;canvas&＃39;];
        this.ctx = this.canvas.getContext(&＃39;2d&＃39;);
        this.timer = null;

        this.video.addEventListener(&＃39;play&＃39;, () => {
            this.width = this.video.videoWidth;
            this.height = this.video.videoHeight;

            this.timer && clearInterval(this.timer);
            this.timer = setInterval(() => {
            	this.draw();
            }, 50);
        }, false);
	}
}
参考资料 
Manipulating video using canvas
 Pixel manipulation with canvas
Canvas and images and pixels
总结：以上就是本篇文的全部内容，希望能对大家的学习有所帮助。更多相关教程请访问Html5视频教程！