C# 后台调用摄像头获取图片

2022-11-19 乐帮网

c# 摄像头

C#使用AForge获取摄像头的图片在不使用控件的情况下。首先新建一个控制台项目，并在Nuget中搜索引入：aforge和AForge.Video，接着编写示例代码如下：

public class CameraPrivoder
    {
        private VideoCaptureDevice _videoCaptureDevice;

        private bool _isCaptured;

        private Bitmap _orgBmp;

        private Timer _delayTimer = new Timer(1000);


        private object _captureLock = new object();

        private object _imgLock = new object();


        public Image Take(ushort index = 0)
        {
            lock (_captureLock)
            {
                _isCaptured = false;
                Connect(index);
                int capIndex = 0;
                while (_isCaptured == false && capIndex < 50)
                {
                    capIndex++;
                    System.Threading.Thread.Sleep(100);
                }
                Close();
                return _orgBmp;
            }
        }

        private bool Connect(ushort index = 0)
        {
            try
            {
                var videoDevices = new FilterInfoCollection(FilterCategory.VideoInputDevice);
                if (videoDevices.Count == 0)
                {
                    return false;
                }
                _videoCaptureDevice = new VideoCaptureDevice(videoDevices[index].MonikerString);
                var videoCapabilities = _videoCaptureDevice.VideoCapabilities;
                //foreach (var video in videoCapabilities)
                //{
                //    LogHelper.Info("预览分辨率->" + video.FrameSize.Width + "*" + video.FrameSize.Height);
                //}
                if (videoCapabilities.Count() > 0)
                    _videoCaptureDevice.VideoResolution = _videoCaptureDevice.VideoCapabilities.Last();

                //var snapVabalities = _videoCaptureDevice.SnapshotCapabilities;
                //foreach (var snap in snapVabalities)
                //{
                //    LogHelper.Info("抓拍分辨率->" + snap.FrameSize.Width + "*" + snap.FrameSize.Height);
                //}
                //if (snapVabalities.Count() > 0)
                //    _videoCaptureDevice.SnapshotResolution = _videoCaptureDevice.SnapshotCapabilities.Last();

                _videoCaptureDevice.NewFrame += new NewFrameEventHandler(CaptureVideoFrame);
                _videoCaptureDevice.Start();

                return true;
            }
            catch (Exception ex)
            {
                //_logger.Error(ex);
            }

            return false;
        }



        private void CaptureVideoFrame(object sender, NewFrameEventArgs eventArgs)
        {
            try
            {
                if (_isCaptured)
                    return;
                lock (_imgLock)
                {
                    Stopwatch sw = new Stopwatch();
                    var bmp = (System.Drawing.Bitmap)eventArgs.Frame.Clone();
                    sw.Start();
                    while ( sw.Elapsed.TotalSeconds < 10)
                    {
                        System.Threading.Thread.Sleep(100);
                        bmp = (System.Drawing.Bitmap)eventArgs.Frame.Clone();
                    }
                    sw.Stop();
                    _orgBmp = bmp;
                    _isCaptured = true;
                }
            }
            catch (Exception ex)
            {
                //_logger.Error(ex);
            }
            finally
            {
                _isCaptured = true;
            }

        }

        private bool Close()
        {
            bool result = false;
            try
            {
                if (_videoCaptureDevice != null)
                {
                    _videoCaptureDevice.NewFrame -= new NewFrameEventHandler(CaptureVideoFrame);
                    _videoCaptureDevice.SignalToStop();
                    //_videoCaptureDevice.WaitForStop();
                    _videoCaptureDevice = null;
                }
                result = true;
            }
            catch (Exception ex)
            {
                //_logger.Error(ex);
                result = false;
            }

           
            return result;

        }
    }

使用方法：

  CameraPrivoder cameraPrivoder = new CameraPrivoder();
            var image = cameraPrivoder.Take();

其中以上方法支持USB摄像头，Take方法中的index代表视频设备的序号，当有多个视频设备此参数有用。

提示源代码如下：链接：https://pan.baidu.com/s/1c73T-RfOQu8fEUwldLXGHg

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