C#调用USB摄像头

本篇文章重点为大家讲解一下C#调用USB摄像头的具体方法， 有需要的小伙伴可以参考一下。

1、AForge安装

右击工程，在管理NuGet程序包中搜索Aforge类库，选择安装，如下图所示

2、进行USB摄像头类封装

a、初始化，初始化时要注意，加载的设备分辨率需要人工配置，如果配置分辨率不存在需要从默认的分辨率中选择

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、绑定回调方法，此方法在摄像头成功预览之后会实时返回数据帧，封装时可以传入PictureBox，把回调旋转后的图片显示在此控件上

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);
            }
        }
  
        /// 
        /// 图像旋转
        /// 
        /// 
        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、抓图事件，手动抓图事件，通过调用GetCurrentVideoFrame()方法获取Bitmap图片

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

d、摄像头重连，此类库中videoSourcePlayer有个属性IsRunning可以判断是否USB摄像头预览中，可以对设备进行重连

private FilterInfoCollection videoDevices = null; //摄像头设备
public VideoCaptureDevice videoSource = null; //视频的来源选择
private VideoSourcePlayer videoSourcePlayer = new VideoSourcePlayer();
public Bitmap img = null;
public int CameraIndex = 1;
        /// 
        /// 默认分辨率
        /// 
        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)
            {
     }
}

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