C#怎么調用USB攝像頭

這篇文章主要介紹“C#怎么調用USB攝像頭”，在日常操作中，相信很多人在C#怎么調用USB攝像頭問題上存在疑惑，小編查閱了各式資料，整理出簡單好用的操作方法，希望對大家解答”C#怎么調用USB攝像頭”的疑惑有所幫助！接下來，請跟著小編一起來學習吧！

1、AForge安裝

右擊工程，在管理NuGet程序包中搜索Aforge類庫，選擇安裝，如下圖所示

2、進行USB攝像頭類封裝

a、初始化，初始化時要注意，加載的設備分辨率需要人工配置，如果配置分辨率不存在需要從默認的分辨率中選擇

videoDevices = new FilterInfoCollection(FilterCategory.VideoInputDevice);
  if (videoDevices.Count > 0 && videoDevices.Count >= CameraIndex)
       {
         FilterInfo info = videoDevices[videoDevices.Count - 1];
         videoSource = new VideoCaptureDevice(info.MonikerString);
          if (videoSource.VideoCapabilities.Length > 0)
            {
             VideoCapabilities tmp = videoSource.VideoCapabilities.
               First(x => x.FrameSize.Width == LocalSize.Width &&
                       x.FrameSize.Height == LocalSize.Height);
                   if (tmp != null)
                   {
                    videoSource.SnapshotResolution = tmp;
                    videoSource.VideoResolution = tmp;
                   }
                 else
                  {
                    int index = (videoSource.VideoCapabilities.Length + 1) / 2;
                    tmp = videoSource.VideoCapabilities[index];
                    }
                  videoSourcePlayer.VideoSource = videoSource;
                  videoSourcePlayer.Start();
                  videoSource.NewFrame += new NewFrameEventHandler(Video_NewFrame);
                    }
                }
            }
      catch (Exception ex)
       {
        LogHelper.Debug(ex);
}

b、綁定回調方法，此方法在攝像頭成功預覽之后會實時返回數據幀，封裝時可以傳入PictureBox，把回調旋轉后的圖片顯示在此控件上

private void Video_NewFrame(object sender, NewFrameEventArgs eventArgs)
        {
            try
            {
                Bitmap video = (Bitmap)eventArgs.Frame.Clone();
                BmpRotate(video);
                if (UsbVideo != null)
                    UsbVideo.Image = video;
            }
            catch (Exception ex)
            {
                LogHelper.Debug(ex);
            }
        }
 
        /// <summary>
        /// 圖像旋轉
        /// </summary>
        /// <param name="_bmp"></param>
        private void BmpRotate(Bitmap _bmp)
        {
            try
            {
                if (CameraRotate == "0")
                {
                }
                else if (CameraRotate == "90")
                {
                    _bmp.RotateFlip(RotateFlipType.Rotate90FlipNone);
                }
                else if (CameraRotate == "180")
                {
                    _bmp.RotateFlip(RotateFlipType.Rotate180FlipNone);
                }
                else if (CameraRotate == "270")
                {
                    _bmp.RotateFlip(RotateFlipType.Rotate270FlipNone);
                }
            }
            catch (Exception ex)
            {
                LogHelper.Debug(ex);
            }
}

c、抓圖事件，手動抓圖事件，通過調用GetCurrentVideoFrame()方法獲取Bitmap圖片

public Bitmap GetCurrentVideoFrame()
      {
            Bitmap bmp = null;
            try
            {
                bmp = videoSourcePlayer.GetCurrentVideoFrame();
                BmpRotate(bmp);
            }
            catch (Exception ex)
            {
                LogHelper.Debug(ex);
            }
            return bmp;
        }

d、攝像頭重連，此類庫中videoSourcePlayer有個屬性IsRunning可以判斷是否USB攝像頭預覽中，可以對設備進行重連

private FilterInfoCollection videoDevices = null; //攝像頭設備
public VideoCaptureDevice videoSource = null; //視頻的來源選擇
private VideoSourcePlayer videoSourcePlayer = new VideoSourcePlayer();
public Bitmap img = null;
public int CameraIndex = 1;
        /// <summary>
        /// 默認分辨率
        /// </summary>
        public Size LocalSize = new Size(640, 480);
        bool isHave = false;
        public string CameraRotate = "0";
        private System.Windows.Forms.PictureBox UsbVideo = null;
        public void ReConnect()
        {
            try
            {
                if (!videoSourcePlayer.IsRunning)
                {
                   videoSource.Stop();
                   videoSource.Start();
                }
            }
            catch (Exception)
            {
     }
}

到此，關于“C#怎么調用USB攝像頭”的學習就結束了，希望能夠解決大家的疑惑。理論與實踐的搭配能更好的幫助大家學習，快去試試吧！若想繼續學習更多相關知識，請繼續關注億速云網站，小編會繼續努力為大家帶來更多實用的文章！