Webcam in C#: AForge.NET

作者：武胜-阿伟

转自：/article/4759790.html

AForge.NET is another C# framework to do image processing and others. For further information just go tohttp://www.aforgenet.com/framework/

Here, I want to show you another way to access your webcam using AForge library. I found this library is more complete and so far work for me.

I can select one of webcams attached in my laptop (I plugged another USB Webcam).. and wow, awesome!

Now, download and extract the AForge library from http://www.aforgenet.com/framework/downloads.html, download this project
here (using VS2005, don’t forget to change the extension from “.doc’ to “.rar”).. and I hope you will have fun with your webcam.

Also, remember to Add Reference for AForge.Video.dll and AForge.Video.DirectShow.dll into the project.

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;

using AForge.Video;
using AForge.Video.DirectShow;

namespace cam_aforge1
{
public partial class Form1 : Form
{
private bool DeviceExist = false;
private FilterInfoCollection videoDevices;
private VideoCaptureDevice videoSource = null;

public Form1()
{
InitializeComponent();
}

// get the devices name
private void getCamList()
{
try
{
videoDevices = new FilterInfoCollection(FilterCategory.VideoInputDevice);
comboBox1.Items.Clear();
if (videoDevices.Count == 0)
throw new ApplicationException();

DeviceExist = true;
foreach (FilterInfo device in videoDevices)
{
comboBox1.Items.Add(device.Name);
}
comboBox1.SelectedIndex = 0; //make dafault to first cam
}
catch (ApplicationException)
{
DeviceExist = false;
comboBox1.Items.Add("No capture device on your system");
}
}

//refresh button
private void rfsh_Click(object sender, EventArgs e)
{
getCamList();
}

//toggle start and stop button
private void start_Click(object sender, EventArgs e)
{
if (start.Text == "&Start")
{
if (DeviceExist)
{
videoSource = new VideoCaptureDevice(videoDevices[comboBox1.SelectedIndex].MonikerString);
videoSource.NewFrame += new NewFrameEventHandler(video_NewFrame);
CloseVideoSource();
videoSource.DesiredFrameSize = new Size(160, 120);
//videoSource.DesiredFrameRate = 10;
videoSource.Start();
label2.Text = "Device running...";
start.Text = "&Stop";
timer1.Enabled = true;
}
else
{
label2.Text = "Error: No Device selected.";
}
}
else
{
if (videoSource.IsRunning)
{
timer1.Enabled = false;
CloseVideoSource();
label2.Text = "Device stopped.";
start.Text = "&Start";
}
}
}

//eventhandler if new frame is ready
private void video_NewFrame(object sender, NewFrameEventArgs eventArgs)
{
Bitmap img = (Bitmap)eventArgs.Frame.Clone();
//do processing here
pictureBox1.Image = img;
}

//close the device safely
private void CloseVideoSource()
{
if (!(videoSource == null))
if (videoSource.IsRunning)
{
videoSource.SignalToStop();
videoSource = null;
}
}

//get total received frame at 1 second tick
private void timer1_Tick(object sender, EventArgs e)
{
label2.Text = "Device running... " + videoSource.FramesReceived.ToString() + " FPS";
}

//prevent sudden close while device is running
private void Form1_FormClosed(object sender, FormClosedEventArgs e)
{
CloseVideoSource();
}
}
}

Snapshots:



Select webcam source



Seeing into the monitor...