How to call the USB camera in C #
This article mainly introduces "how C#calls USB camera". In daily operation, I believe many people have doubts about how C#calls USB camera. Xiaobian consulted all kinds of information and sorted out simple and easy operation methods. I hope to help you answer the doubts of "how C#calls USB camera"! Next, please follow the small series to learn together!
1. AForge installation
Right-click the project, search for Aforge class library in the Manage NuGet package, and select Install, as shown below
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) { }}到此，关于"C#怎么调用USB摄像头"的学习就结束了，希望能够解决大家的疑惑。理论与实践的搭配能更好的帮助大家学习，快去试试吧!若想继续学习更多相关知识，请继续关注网站，小编会继续努力为大家带来更多实用的文章!
