C#调用USB摄像头的方法
C#调用USB摄像头使用AForge类库进行开发,供大家参考,具体内容如下
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); } } /// <summary> /// 图像旋转 /// </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; /// <summary> /// 默认分辨率 /// </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) { } }
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