在Windows IoT上使用网络摄像头

在树莓派上可以使用它官方标配的摄像头，但是这个摄像头似乎不能被Windows IoT识别和使用。但是，可以在树莓派的USB口上插入任意型号的摄像头，就可以实现树莓派的拍摄功能。

关于摄像头的寻找和拍摄，我将其封装成一个类，如下：

public class WebCamHelper{public MediaCapture mediaCapture;private bool initialized = false;/// <summary>/// 异步初始化网络摄像头/// </summary>public async Task InitializeCameraAsync(){if (mediaCapture == null){// 尝试发现摄像头var cameraDevice = await FindCameraDevice();if (cameraDevice == null){// 没有发现摄像头Debug.WriteLine("No camera found!");initialized = false;return;}// Creates MediaCapture initialization settings with foudnd webcam devicevar settings = new MediaCaptureInitializationSettings { VideoDeviceId = cameraDevice.Id };mediaCapture = new MediaCapture();await mediaCapture.InitializeAsync(settings);initialized = true;}}/// <summary>/// 异步寻找摄像头，如果没有找到，返回null，否则返回DeviceInfomation/// </summary>private static async Task<DeviceInformation> FindCameraDevice(){// Get available devices for capturing picturesvar allVideoDevices = await DeviceInformation.FindAllAsync(DeviceClass.VideoCapture);if (allVideoDevices.Count > 0){// 如果发现，返回return allVideoDevices[0];}else{return null;}}/// <summary>/// 开启摄像头预览/// </summary>public async Task StartCameraPreview(){try{await mediaCapture.StartPreviewAsync();}catch{initialized = false;Debug.WriteLine("Failed to start camera preview stream");}}/// <summary>/// 关闭摄像头预览/// </summary>public async Task StopCameraPreview(){try{await mediaCapture.StopPreviewAsync();}catch{Debug.WriteLine("Failed to stop camera preview stream");}}/// <summary>/// 拍摄照片，返回StorageFile，文件将被存储到临时文件夹/// </summary>public async Task<StorageFile> CapturePhoto(){// Create storage file in local app storagestring fileName = GenerateNewFileName() + ".jpg";CreationCollisionOption collisionOption = CreationCollisionOption.GenerateUniqueName;StorageFile file = await ApplicationData.Current.TemporaryFolder.CreateFileAsync(fileName, collisionOption);// 拍摄并且存储await mediaCapture.CapturePhotoToStorageFileAsync(ImageEncodingProperties.CreateJpeg(), file);//await Task.Delay(500);return file;}/// <summary>/// 产生文件名称/// </summary>private string GenerateNewFileName(){return " IoTSample" + DateTime.Now.ToString("yyyy.MMM.dd HH-mm-ss");}public string GenerateUserNameFileName(string userName){return userName + DateTime.Now.ToString("yyyy.MM.dd HH-mm-ss") + ".jpg";}/// <summary>/// 如果摄像头初始化成功，返回true，否则返回false/// </summary>public bool IsInitialized(){return initialized;}

使用示例：

1.初始化

private WebCamHelper camera;if(camera==null){camera = new WebCamHelper();await camera.InitializeCameraAsync();}if(camera.IsInitialized()){tbMessage.Text = "Camera启动成功...";}else{tbMessage.Text = "Camera启动失败...";}

2.拍摄

if (!camera.IsInitialized()) return;StorageFile imgFile = await camera.CapturePhoto();

拍摄完成的图片文件就存储在上面的imgFile中。

3.视频预览

如果想开启视频预览，实时查看摄像头捕获的图像，可以在XAML中先添加一个CaptureElement控件：

<CaptureElement x:Name="cameraElement"Loaded="cameraElement_Loaded"/>

在CaptureElement的Loaded事件中执行source绑定：

cameraElement.Source = camera.mediaCapture;

然后在想要开始视频预览的地方，执行：

await camera.StartCameraPreview();

关闭视频预览：

await camera.StopCameraPreview();

 

转载于:https://www.cnblogs.com/mengnan/p/6790583.html

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