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AForge.NET是一個專門為開發人員和研究者基於C#架構設計的,這個架構提供了不同的類庫和關於類庫的資源,還有很多應用程式例子,包括電腦視覺與人工智慧,影像處理,神經網路,遺傳演算法,機器學習,機器人等領域。
根據網上的方法,運行程式網路攝影機出來了,但是怎麼呢?找到一個顯示圖片方法如下
[csharp] view plaincopyprint?
- private void video_NewFrame(object sender, NewFrameEventArgs eventArgs)
- {
- Bitmap img = (Bitmap)eventArgs.Frame.Clone();
- //do processing here
- pictureBox1.Image = img;
- }
開始參考這句代碼寫了:
[csharp] view plaincopyprint?
- private void video_NewFrame(object sender, NewFrameEventArgs eventArgs)
- {
- Bitmap img = (Bitmap)eventArgs.Frame.Clone();
- string imgPath = dirc + "/" + DateTime.Now.ToString("yyyyMMddhhmmss") + ".jpg";
- img.Save(imgPath);
- }
但是點擊程式就自動不停截了大量的圖片,最後導致程式出問題。想了一個笨方法,可以只截一次圖:
[csharp] view plaincopyprint?
- private int flag = 1;
- /// <summary>
- ///
- /// </summary>
- private void toolStripButton3_Click(object sender, EventArgs e)
- {
- flag = 0;
- videoSource.NewFrame += new NewFrameEventHandler(video_NewFrame);
- }
- private void video_NewFrame(object sender, NewFrameEventArgs eventArgs)
- {
- Bitmap bitmap = (Bitmap)eventArgs.Frame.Clone();
- if (flag == 0)
- {
- string img = dirc + "/" + DateTime.Now.ToString("yyyyMMddhhmmss") + ".jpg";
- bitmap.Save(img);
- flag = 1;
- }
- }
完整的程式碼如下:
[csharp] view plaincopyprint?
- using System;
- using System.Collections.Generic;
- using System.ComponentModel;
- using System.Data;
- using System.Drawing;
- using System.Drawing.Imaging;
- using System.Text;
- using System.Windows.Forms;
- using System.IO;
- using AForge;
- using AForge.Video;
- using AForge.Video.DirectShow;
- using AForge.Imaging;
- using AForge.Imaging.Filters;
-
- namespace Camera
- {
- public partial class Form1 : Form
- {
- private FilterInfoCollection videoDevices;
- private VideoCaptureDevice videoSource;
- private int flag = 1;
- private string dirc = System.AppDomain.CurrentDomain.BaseDirectory + "Images"; //儲存的目錄
-
- public Form1()
- {
- InitializeComponent();
- }
-
- private void Form1_Load(object sender, EventArgs e)
- {
- if (!Directory.Exists(dirc))
- Directory.CreateDirectory(dirc);
-
- try
- {
- // 枚舉所有視頻輸入裝置
- videoDevices = new FilterInfoCollection(FilterCategory.VideoInputDevice);
- if (videoDevices.Count == 0)
- throw new ApplicationException();
-
- foreach (FilterInfo device in videoDevices)
- {
- tscbxCameras.Items.Add(device.Name);
- }
-
- tscbxCameras.SelectedIndex = 0;
- }
- catch (ApplicationException)
- {
- tscbxCameras.Items.Add("No local capture devices");
- videoDevices = null;
- }
- }
-
- private void toolStripButton1_Click(object sender, EventArgs e)
- {
- CameraConn();
- }
-
- /// <summary>
- /// 串連開啟網路攝影機
- /// </summary>
- private void CameraConn()
- {
- videoSource = new VideoCaptureDevice(videoDevices[tscbxCameras.SelectedIndex].MonikerString);
- videoSource.DesiredFrameSize = new Size(500, 300);
- videoSource.DesiredFrameRate = 1;
- videPlayer.VideoSource = videoSource;
- videPlayer.Start();
- }
- /// <summary>
- /// 關閉網路攝影機
- /// </summary>
- private void toolStripButton2_Click(object sender, EventArgs e)
- {
- videPlayer.SignalToStop();
- videPlayer.WaitForStop();
- }
-
- private void Form1_FormClosing(object sender, FormClosingEventArgs e)
- {
- toolStripButton2_Click(null, null);
- }
- /// <summary>
- ///
- /// </summary>
- private void toolStripButton3_Click(object sender, EventArgs e)
- {
- flag = 0;
- videoSource.NewFrame += new NewFrameEventHandler(video_NewFrame);
- }
- private void video_NewFrame(object sender, NewFrameEventArgs eventArgs)
- {
- Bitmap bitmap = (Bitmap)eventArgs.Frame.Clone();
- if (flag == 0)
- {
- string img = dirc + "/" + DateTime.Now.ToString("yyyyMMddhhmmss") + ".jpg";
- bitmap.Save(img);
- flag = 1;
- }
- }
- }
- }
介面效果如下:
c# 利用AForge.NET組件操作網路攝影機