调用AForge.video.DirectShow免费实现摄像头采集和上下左右镜像功能

简单封装了个AForgeVideo摄像头库:

//AForge摄像头库
import dotNet
import System.Drawing;
import System.Windows.Forms;

class AForgeVideo{
	ctor( winform ){
		this.pictureBox = ..System.Windows.Forms.CreateEmbed("PictureBox",winform); 
		this.pictureBox.BackColor = ..System.Drawing.Color.Black;
		this.pictureBox.SizeMode = ..System.Windows.Forms.PictureBoxSizeMode.StretchImage;
		this.carema = ..dotNet.load("\res\AForge.dll");
		this.AForgeCamera = this.carema.import("AForge.Video");
		this.flip = 0;
		this.videoDevice = null;
		..table.gc(this,"stop");
	};
	
	getNameList = function(){
		var videoDevices = this.AForgeCamera.DirectShow.FilterInfoCollection(this.AForgeCamera.DirectShow.FilterCategory.VideoInputDevice);
		var retTab = {};
		if(videoDevices.Count>0){
			for(i=0;videoDevices.Count-1;1){
				//压入摄像头设备号名称列表	
				..table.push(retTab , videoDevices.Item[i].MonikerString);
			}
			return retTab; 
		}
		return null;
	}
	
	getVideoCapabilitiesList = function(deviceName){
		if(deviceName!=null){
			var videoDevice = this.AForgeCamera.DirectShow.VideoCaptureDevice(deviceName);
			var videoCapabilitiesEx = videoDevice.VideoCapabilities;
			var retTab = {};
			if(videoCapabilitiesEx.LongLength>0){
				for(i=0;videoCapabilitiesEx.LongLength-1;1){
					..table.push(retTab,{
						["Width"] = videoCapabilitiesEx.Item[i].FrameSize.Width,
						["Height"] = videoCapabilitiesEx.Item[i].FrameSize.Height,
						["FrameRate"] = videoCapabilitiesEx.Item[i].FrameRate,
					});
				}
				return retTab;
			}
			return null; 
		}
		return null;
	}
	
	start = function(DeviceIndex=1,index=1){
		if(this.videoDevice){
			this.videoDevice.Stop();
		}
		
		var namelist = this.getNameList();
		if(DeviceIndex <= #namelist){
			name = namelist[DeviceIndex];
		}else {
			//超出摄像头数量,不开启
			return false;
		}	
		//设定帧率和分辨率
		var VideoCapabilities = this.getVideoCapabilitiesList(name);
		this.videoDevice = this.AForgeCamera.DirectShow.VideoCaptureDevice(name);
		
		if(VideoCapabilities!=null){
			if(index>#VideoCapabilities){
				index = 1;
			}
			this.videoDevice.DesiredFrameRate = VideoCapabilities[index].FrameRate;
			this.videoDevice.DesiredFrameSize = ..System.Drawing.Size(VideoCapabilities[index].Width,VideoCapabilities[index].Height);
			this.videoDevice.DesiredSnapshotSize = ..System.Drawing.Size(VideoCapabilities[index].Width,VideoCapabilities[index].Height);
		}
		
		this.videoDevice.NewFrame = function(sender, NewFrameEventArgs){
			var temp = NewFrameEventArgs.Frame.Clone();
    		select(this.flip) {
        		case 0 {
             		
        		}
        		case 1 {
            		temp.RotateFlip(..System.Drawing.RotateFlipType.RotateNoneFlipX);
        		}
        		case 2 {
            		temp.RotateFlip(..System.Drawing.RotateFlipType.RotateNoneFlipXY);
        		}
        		case 3 {
            		temp.RotateFlip(..System.Drawing.RotateFlipType.RotateNoneFlipY);
        		}
        		else {
        		}
    		}
     		
    		if (this.pictureBox.Image != null)
    		{
        		this.pictureBox.Image.Dispose();
    		}
    		this.pictureBox.Image = temp;
		}
		this.videoDevice.Start();
		return true;
	}
	
	stop = function(){
		if(this.videoDevice){
			this.videoDevice.Stop();
			this.videoDevice = null;
		}
	}
	
	flipLoop = function(){
		select(this.flip) {
        	case 0 {
            	this.flip=1;
        	}
        	case 1 {
            	this.flip=2;
        	}
        	case 2 {
            	this.flip=3;
        	}
        	case 3 {
            	this.flip=0;
        	}
        	else {
        	}
    	}
	}
}

/**intellisense()
AForgeVideo = AForge摄像头库
AForgeVideo(.(winform) = 创建 摄像头 界面
AForgeVideo() = !AVideo.
end intellisense**/

/**intellisense(!AVideo)
getNameList() = 获取摄像头设备硬件DeviceName名称列表
getVideoCapabilitiesList(.(DeviceName) = 获取指定设备的 分辨率和帧率 列表，如果不存在那么返回 null
start(.(DeviceIndex,CapabilitiesIndex) = 开启摄像头\n DeviceIndex:设备序号 , CapabilitiesIndex:分辨率和帧率表序号
stop() = 关闭摄像头
flipLoop() = 循环镜像图像,调用一次改变一次镜像方向
end intellisense**/

使用的时候:

import win.ui;
/*DSG{{*/
mainForm = win.form(text="aardio工程2";right=1209;bottom=556)
mainForm.add(
button={cls="button";text="start";left=16;top=519;right=127;bottom=545;db=1;dl=1;z=2};
button2={cls="button";text="flip";left=142;top=519;right=254;bottom=545;db=1;dl=1;z=3};
button3={cls="button";text="stop";left=265;top=519;right=381;bottom=545;db=1;dl=1;z=4};
button4={cls="button";text="start";left=833;top=518;right=944;bottom=544;db=1;dr=1;z=6};
button5={cls="button";text="flip";left=959;top=518;right=1071;bottom=544;db=1;dr=1;z=7};
button6={cls="button";text="stop";left=1082;top=518;right=1198;bottom=544;db=1;dr=1;z=8};
custom={cls="custom";text="自定义控件";left=0;top=0;right=601;bottom=496;bgcolor=12639424;db=1;dl=1;dr=0.5;dt=1;z=1};
custom2={cls="custom";text="自定义控件";left=609;top=0;right=1210;bottom=496;bgcolor=12639424;db=1;dl=0.5;dr=1;dt=1;z=5}
)
/*}}*/

import AForgeVideo;
var video = AForgeVideo(mainForm.custom);

mainForm.button.oncommand = function(id,event){
	//默认开启序号1摄像头,分辨率为序号1的分辨率和帧率
	video.start();
}

mainForm.button2.oncommand = function(id,event){
	//摄像头1镜像
	video.flipLoop();
}

mainForm.button3.oncommand = function(id,event){
	//摄像头1停止
	video.stop();
}

//定义2号摄像头
var video2 = AForgeVideo(mainForm.custom2);
mainForm.button4.oncommand = function(id,event){
	//开启序号2摄像头,分辨率为序号1的分辨率和帧率
	video2.start(2);
}

mainForm.button5.oncommand = function(id,event){
	//摄像头2镜像
	video2.flipLoop();
}

mainForm.button6.oncommand = function(id,event){
	//摄像头2停止
	video2.stop();
}

mainForm.show();
return win.loopMessage();

完整示例工程和库代码如下:

AForge.zip

C#工程中使用Aforge摄像头

using AForge;
using AForge.Video;
using AForge.Video.DirectShow;
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace WindowsFormsApp2
{
    public partial class Form1 : Form
    {
        VideoCaptureDevice VideoDevice;
        public Form1()
        {
            InitializeComponent();
        }

        private void Form1_Load(object sender, EventArgs e)
        {
            FilterInfoCollection VideoDevices = new FilterInfoCollection(FilterCategory.VideoInputDevice);
            //默认取第一个序号的摄像头
            VideoDevice = new VideoCaptureDevice(VideoDevices[0].MonikerString);

            foreach (var VideoCapabilitie in VideoDevice.VideoCapabilities)
            {
                Console.WriteLine(VideoCapabilitie.AverageFrameRate);
                Console.WriteLine(VideoCapabilitie.FrameSize);
            }
            VideoDevice.VideoResolution = VideoDevice.VideoCapabilities[4];
            VideoDevice.NewFrame += OnNewFrame;
            VideoDevice.Start();
        }

        void OnNewFrame(object sender, NewFrameEventArgs eventArgs)
        {
            //var temp = eventArgs.Frame.Clone();
            if (pictureBox1.Image != null)
            {
                pictureBox1.Image.Dispose();
            }
            pictureBox1.Image = (Bitmap)eventArgs.Frame.Clone();

        }

        private void button1_Click(object sender, EventArgs e)
        {
            VideoDevice.Stop();
        }

        private void button2_Click(object sender, EventArgs e)
        {
            VideoDevice.Start();
        }

        private void Form1_FormClosed(object sender, FormClosedEventArgs e)
        {
            VideoDevice.Stop();
        }
    }
}

WindowsFormsApp2.zip

更新:

给摄像头增加可移动水平辅助线和双击全屏功能

import win.ui;
/*DSG{{*/
var winform = win.form(text="aardio form";right=739;bottom=499)
winform.add(
video_line={cls="plus";left=0;top=205;right=740;bottom=206;bgcolor=65280;dl=1;dr=1;z=1}
)
/*}}*/

import AForgeVideo;
var video = AForgeVideo(winform);

//禁用清除背景
winform.onEraseBkgnd  = lambda() 0;

try{//防止意外报错
	video.start(1/*摄像头序号*/,1/*分辨率序号*/);
	video.flip = 1/*水平镜像*/;
}
catch(e)
{
	winform.msgboxErr("摄像头打开失败!")
}	
//使辅助线显示在摄像头上
winform.video_line.setParent(winform)
//双击全屏
video.pictureBox.MouseDoubleClick = function(sender, e){
	if(winform.parent){
		winform.parent.fullscreen();
	}else {
		winform.fullscreen();
	}
}
//单击移动线
video.pictureBox.MouseClick = function(sender, e){
	var x,y = win.getMessagePos();
	x,y = win.toClient(winform.hwnd,x,y);
	winform.video_line.setPos(0,y);
}

winform.onClose = function(hwnd,message,wParam,lParam){
    video.stop();
}

winform.show();
win.loopMessage();
return winform;

厉害了大佬

厉害！！能不能分享一下 相机亮度 对比度 白平衡这些调节 拍照功能 怎么实现，谢谢。

回复#7 @user11 :

我这里只是简单的演示, 你百度下有方法的,简单的方法是调用属性

videoDevice.DisplayPropertyPage(0);

会弹出来属性窗.

至于代码的, 也能搜得到, 你自己试一试吧

请教一下怎么拍照保存图像到剪贴板呢？

回复#8 @neilyih :

提问的时候干嘛要在问题前面加上一些和代码无关的牢骚呢?(我已经帮你删掉)

win.clip.writeBitmap 图片写入剪贴板

c# 的winform界面中给摄像头画面增加功能:

鼠标点击画面, 在点击点位置绘制一条斜线 , 双击鼠标隐藏

难点:

摄像头的分辨率和界面上的picturebox的大小并不是一致的, 摄像头图片会被拉伸填充满画面, 那么你在picturebox点击的位置就需要对应的进行缩放, 这样在真实摄像头画面图片里面绘制的线才是真正的位置, 要不然你点击的位置绘线会出现很大偏差.

解决办法就是: 对应点进行比例缩放即可. 这样绘制到图片内的线在picturebox里无论怎么拉伸都是实际位置了.

FilterInfoCollection VideoDevices = new FilterInfoCollection(FilterCategory.VideoInputDevice);
//默认取第一个序号的摄像头
VideoDevice1 = new VideoCaptureDevice(VideoDevices[端口1].MonikerString);
VideoDevice1.VideoResolution = VideoDevice1.VideoCapabilities[分辨率1];
VideoDevice1.NewFrame += OnNewFrame1;
VideoDevice1.Start();
                
bool video1_clickFlag = false;
int video1_clickX;
int video1_clickY;
private void video1_MouseClick(object sender, MouseEventArgs e)
{

    if (e.Button == MouseButtons.Left)
    {
	video1_clickX = e.X;
	video1_clickY = e.Y;
	video1_clickFlag = true;
    }
    else if (e.Button == MouseButtons.Right)
    {
	Form fm1 = new jiaodu();
	fm1.ShowDialog();
    }

}
private void video1_MouseDoubleClick(object sender, MouseEventArgs e)
{
    video1_clickFlag = false;
}
void OnNewFrame1(object sender, NewFrameEventArgs eventArgs)
{
    var temp = (Bitmap)eventArgs.Frame.Clone();

    switch (flip1)
    {
	case 0:
	    break;
	case 1:
	    temp.RotateFlip(System.Drawing.RotateFlipType.RotateNoneFlipX);
	    break;
	case 2:
	    temp.RotateFlip(System.Drawing.RotateFlipType.RotateNoneFlipY);
	    break;
	case 3:
	    temp.RotateFlip(System.Drawing.RotateFlipType.RotateNoneFlipXY);
	    break;
	default:
	    break;
    }

    if (video1_clickFlag)
    {
	using (var graphics = Graphics.FromImage(temp))
	using (var pen = new Pen(Color.Lime, 1))
	{

	    var bili_X = temp.Width * 1.0 / video1.Width;
	    var bili_Y = temp.Height * 1.0 / video1.Height;

	    int Mdian_X = (int)(video1_clickX * bili_X);
	    int Mdian_Y = (int)(video1_clickY * bili_Y);

	    var p1 = new Point(Mdian_X, Mdian_Y);
	    //计算直线上的端点P0
	    var x0 = (int)(Mdian_X - Mdian_Y / Math.Tan(GlobalVar.jiaodu * Math.PI / 180));
	    //计算直线上的端点P2
	    var x2 = (int)(Mdian_X + (temp.Height - Mdian_Y) / Math.Tan(GlobalVar.jiaodu * Math.PI / 180));

	    var p0 = new Point(x0, 0);
	    var p2 = new Point(x2, temp.Height);

	    //在Bitmap上绘制直线
	    graphics.DrawLine(pen, p0, p1);
	    graphics.DrawLine(pen, p1, p2);

	    var p3 = new Point(0, Mdian_Y);
	    var p4 = new Point(temp.Width, Mdian_Y);

	    //在Bitmap上绘制直线
	    graphics.DrawLine(pen, p3, p1);
	    graphics.DrawLine(pen, p1, p4);

	}
    }

    if (video1.Image != null)
    {
	video1.Image.Dispose();
    }
    video1.Image = temp;

}

如果有两个摄像头, 软件里需要交换图像, 那么可以:

 VideoDevice1.NewFrame -= OnNewFrame1;
 VideoDevice2.NewFrame -= OnNewFrame2;

 VideoDevice1.NewFrame += OnNewFrame2;
 VideoDevice2.NewFrame += OnNewFrame1;

当窗口关闭的时候记得释放掉:

private void Form1_FormClosing(object sender, FormClosingEventArgs e)
        {
            try
            {
                VideoDevice1.Stop();
                VideoDevice2.Stop();

                VideoDevice1.NewFrame -= OnNewFrame1;
                VideoDevice2.NewFrame -= OnNewFrame2;

            }
            catch (Exception)
            {

                // throw;
            }
        }