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导读 | 这篇文章主要为大家详细介绍了 C# 调用 USB 摄像头的方法,文中示例代码介绍的非常详细,具有一定的参考价值,感兴趣的小伙伴们可以参考一下 |
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);
}
}
///
/// 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)
{}}
以上就是本文的全部内容,希望对大家的学习有所帮助。
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