private void FaceDetection_FaceDetected(FaceDetectionEffect sender, FaceDetectedEventArgs args)
{
DispatcherWrapper.Current().Dispatch(() =>
{
var properties = DefaultManager.VideoDeviceController.GetMediaStreamProperties(MediaStreamType.VideoPreview) as VideoEncodingProperties;
if (properties == null || properties.Width == 0 || properties.Height == 0)
{
return;
}
var canvas = FacesCanvas.Child as Canvas;
canvas.Height = properties.Height;
canvas.Width = properties.Width;
FaceDetected?.Invoke(sender, args);
canvas.Children.Clear();
foreach (var face in args.ResultFrame.DetectedFaces.Where(x => x.FaceBox.Width != 0 && x.FaceBox.Height != 0))
{
var box = new Rectangle
{
Height = face.FaceBox.Height,
Width = face.FaceBox.Width,
Stroke = FacesBoxColor.ToSolidColorBrush(),
StrokeThickness = 2,
};
Canvas.SetLeft(box, face.FaceBox.X);
Canvas.SetTop(box, face.FaceBox.Y);
canvas.Children.Add(box);
}
FaceCountChanged?.Invoke(this, canvas.Children.Count());
});
}
private async Task CloseCamera()
{
if (faceDetectionEffect != null && faceDetectionEffect.Enabled)
{
faceDetectionEffect.Enabled = false;
faceDetectionEffect.FaceDetected -= FaceDetected;
await capture.ClearEffectsAsync(MediaStreamType.VideoPreview);
faceDetectionEffect = null;
facesCanvas.Children.Clear();
}
if (capture != null)
{
if (isPreviewing)
{
await capture.StopPreviewAsync();
isPreviewing = false;
}
capture.Dispose();
capture = null;
}
//if (photoFile != null)
//{
// await photoFile.DeleteAsync(StorageDeleteOption.PermanentDelete);
// photoFile = null;
//}
}
private async Task CleanUp()
{
if (_faceDetectionEffect != null)
{
_faceDetectionEffect.FaceDetected -= FaceDetectionEffect_FaceDetected;
_faceDetectionEffect = null;
}
if (_orientationSensor != null)
{
_orientationSensor.OrientationChanged -= OrientationSensor_OrientationChanged;
}
if (_displayInformation != null)
{
_displayInformation.OrientationChanged -= DisplayInformation_OrientationChanged;
}
if (ApiInformation.IsTypePresent("Windows.Phone.UI.Input.HardwareButtons"))
{
HardwareButtons.CameraPressed -= HardwareButtons_CameraPressed;
}
if (_mediaCapture != null)
{
if (_mediaCapture.CameraStreamState == Windows.Media.Devices.CameraStreamState.Streaming)
{
await _mediaCapture.StopPreviewAsync();
}
_mediaCapture.Dispose();
_mediaCapture = null;
}
_initialized = false;
}
private async void InitMediaCapture()
{
mediaCapture = new Windows.Media.Capture.MediaCapture();
await mediaCapture.InitializeAsync(captureInitSettings);
Windows.Media.Effects.VideoEffectDefinition def = new Windows.Media.Effects.VideoEffectDefinition(Windows.Media.VideoEffects.VideoStabilization);
await mediaCapture.AddVideoEffectAsync(def, MediaStreamType.VideoRecord);
profile = Windows.Media.MediaProperties.MediaEncodingProfile.CreateMp4(Windows.Media.MediaProperties.VideoEncodingQuality.Qvga);
System.Guid MFVideoRotationGuild = new System.Guid("C380465D-2271-428C-9B83-ECEA3B4A85C1");
int MFVideoRotation = ConvertVideoRotationToMFRotation(VideoRotation.None);
profile.Video.Properties.Add(MFVideoRotationGuild, PropertyValue.CreateInt32(MFVideoRotation));
var transcoder = new Windows.Media.Transcoding.MediaTranscoder();
transcoder.AddVideoEffect(Windows.Media.VideoEffects.VideoStabilization);
capturePreview.Source = mediaCapture;
DisplayInformation.AutoRotationPreferences = DisplayOrientations.None;
var definition = new FaceDetectionEffectDefinition();
definition.SynchronousDetectionEnabled = false;
definition.DetectionMode = FaceDetectionMode.HighPerformance;
faceDetectionEffect = (FaceDetectionEffect)await mediaCapture.AddVideoEffectAsync(definition, MediaStreamType.VideoPreview);
faceDetectionEffect.DesiredDetectionInterval = TimeSpan.FromMilliseconds(33);
faceDetectionEffect.Enabled = true;
faceDetectionEffect.FaceDetected += FaceDetectionEffect_FaceDetected;
}
/// <summary>
/// Initializes face detection on the preview stream, from https://docs.microsoft.com/en-us/windows/uwp/audio-video-camera/scene-analysis-for-media-capture
/// </summary>
/// <returns></returns>
public async Task InitializeFaceDetection()
{
// Load the face service client to to face recognition with Cognitive Services
if (FaceService == null)
{
FaceService = await FaceServiceHelper.CreateNewFaceServiceAsync();
}
// Create the definition, which will contain some initialization settings
var definition = new FaceDetectionEffectDefinition();
// To ensure preview smoothness, do not delay incoming samples
definition.SynchronousDetectionEnabled = false;
// In this scenario, choose detection speed over accuracy
definition.DetectionMode = FaceDetectionMode.HighPerformance;
// Add the effect to the preview stream
_faceDetectionEffect = (FaceDetectionEffect)await _mediaCapture.AddVideoEffectAsync(definition, MediaStreamType.VideoPreview);
// TODO: Chance to a good frequency to save Cognitive Services API calls
// Choose the shortest interval between detection events
//_faceDetectionEffect.DesiredDetectionInterval = TimeSpan.FromMilliseconds(33);
// Currently we offline detect faces every 3 seconds to save API calls
_faceDetectionEffect.DesiredDetectionInterval = TimeSpan.FromMilliseconds(3000);
// Start detecting faces
_faceDetectionEffect.Enabled = true;
// Register for face detection events
_faceDetectionEffect.FaceDetected += FaceDetectionEffect_FaceDetected;
_isDetecting = true;
}
private async void _faceDetectionEffect_FaceDetectedAsync(FaceDetectionEffect sender, FaceDetectedEventArgs args)
{
if (args.ResultFrame.DetectedFaces.Count > 0)
{
try
{
if (!isFaceFound || DateTime.Now.Subtract(faceLastDate).TotalMinutes > 5)
{
Analytics.TrackEvent("Faces found, starting capture");
isFaceFound = true;
await Dispatcher.RunAsync(CoreDispatcherPriority.Normal, async() =>
{
timerFace.Stop();
timerFace.Start();
await ActivateUI();
});
}
faceLastDate = DateTime.Now;
}
catch (Exception)
{
// eat error
}
//await ContCapture();
}
}
/// <summary>
/// Инициализирует работу с камерой и с локальным распознавателем лиц
/// </summary>
private async Task Init()
{
MC = new MediaCapture();
var cameras = await DeviceInformation.FindAllAsync(DeviceClass.VideoCapture);
var camera = cameras.First();
var settings = new MediaCaptureInitializationSettings()
{
VideoDeviceId = camera.Id
};
await MC.InitializeAsync(settings);
ViewFinder.Source = MC;
// Create face detection
var def = new FaceDetectionEffectDefinition();
def.SynchronousDetectionEnabled = false;
def.DetectionMode = FaceDetectionMode.HighPerformance;
FaceDetector = (FaceDetectionEffect)(await MC.AddVideoEffectAsync(def, MediaStreamType.VideoPreview));
FaceDetector.FaceDetected += FaceDetectedEvent;
FaceDetector.DesiredDetectionInterval = TimeSpan.FromMilliseconds(100);
FaceDetector.Enabled = true;
await MC.StartPreviewAsync();
var props = MC.VideoDeviceController.GetMediaStreamProperties(MediaStreamType.VideoPreview);
VideoProps = props as VideoEncodingProperties;
}
private async void FaceDetectionEffect_FaceDetected(FaceDetectionEffect sender, FaceDetectedEventArgs args)
{
var detectedFaces = args.ResultFrame.DetectedFaces;
await Dispatcher
.RunAsync(CoreDispatcherPriority.Normal,
() => DrawFaceBoxes(detectedFaces));
}
private async void FaceDetectionEffect_FaceDetected(FaceDetectionEffect sender, FaceDetectedEventArgs args)
{
await Dispatcher.RunAsync(CoreDispatcherPriority.Normal, () =>
{
setFaceInfoText(args.ResultFrame.DetectedFaces.Count);
});
}
private async Task CreateFaceDetectionEffectAsync()
{
//Create the definition, which will contain some initialization settings
var definition = new FaceDetectionEffectDefinition();
//To ensure preview smoothness, do not delay incoming samples
definition.SynchronousDetectionEnabled = false;
//In this scenario, choose detection speed over accuracy
definition.DetectionMode = FaceDetectionMode.HighPerformance;
//Add the effect to the preview stream
_faceDetectionEffect = (FaceDetectionEffect)await mediaCapture.AddVideoEffectAsync(definition, MediaStreamType.VideoPreview);
//Register for face detection events
_faceDetectionEffect.FaceDetected += FaceDetectionEffect_FaceDetected;
// Choose the shortest interval between detection events
_faceDetectionEffect.DesiredDetectionInterval = TimeSpan.FromMilliseconds(33);
// Start detecting faces
_faceDetectionEffect.Enabled = true;
//status.Text = "The CreateFaceDetectionEffectAsync has been done...";
Debug.WriteLine("The CreateFaceDetectionEffectAsync has been done...");
}
private async void FaceDetectionEffect_FaceDetected(FaceDetectionEffect sender, FaceDetectedEventArgs args)
{
Debug.WriteLine("Face Number: {0}", args.ResultFrame.DetectedFaces.Count);
//Ask the UI thread to render the face bounding boxes
await Dispatcher.RunAsync(CoreDispatcherPriority.Normal, () => HighlightDetectedFaces(args.ResultFrame.DetectedFaces));
try
{
//if(args.ResultFrame.DetectedFaces.Count > faceNumber)
//{
// faceNumber = args.ResultFrame.DetectedFaces.Count;
// //await SendPhotoAsync();
//}
//else
//{
// faceNumber = args.ResultFrame.DetectedFaces.Count;
//}
faceNumber = args.ResultFrame.DetectedFaces.Count;
}
catch (Exception ex)
{
Debug.WriteLine("Exception when sending a photo: {0}", ex.ToString());
}
//status.Text = "The number of faces is " + faceNumber;
// Debug.WriteLine("The number of faces is" + faceNumber);
}
private async void FaceDetectionEffect_FaceDetected(FaceDetectionEffect sender, FaceDetectedEventArgs args)
{
Debug.WriteLine($"{args.ResultFrame.DetectedFaces.Count} faces detected");
if (args.ResultFrame.DetectedFaces.Count == 0)
{
return;
}
await Dispatcher.RunAsync(CoreDispatcherPriority.Normal, async() =>
{
try
{
_faceDetectionEffect.FaceDetected -= FaceDetectionEffect_FaceDetected;
// Do stuff here
var bitmap = await GetWriteableBitmapFromPreviewFrame();
var file = await SaveBitmapToStorage(bitmap);
await AddPerson(file);
var faces = await FindFaces(file);
var identities = await Identify(faces);
var candidates = await ExtractTopCandidate(identities, faces);
string json = JsonConvert.SerializeObject(candidates, Formatting.Indented);
ResultText.Text = json;
}
finally
{
_faceDetectionEffect.FaceDetected += FaceDetectionEffect_FaceDetected;
}
});
}
private async void _faceDetectionEffect_FaceDetected(FaceDetectionEffect sender, FaceDetectedEventArgs args)
{
await Windows.ApplicationModel.Core.CoreApplication.MainView.CoreWindow.Dispatcher.RunAsync(CoreDispatcherPriority.Normal, () =>
{
this.VisualizationCanvas.Children.Clear();
});
foreach (Windows.Media.FaceAnalysis.DetectedFace face in args.ResultFrame.DetectedFaces)
{
BitmapBounds faceRect = face.FaceBox;
await Windows.ApplicationModel.Core.CoreApplication.MainView.CoreWindow.Dispatcher.RunAsync(CoreDispatcherPriority.Normal, () =>
{
Rectangle box = new Rectangle();
box.Tag = face.FaceBox;
box.Width = (uint)(face.FaceBox.Width);
box.Height = (uint)(face.FaceBox.Height);
box.Fill = this.fillBrush;
box.Stroke = this.lineBrush;
box.StrokeThickness = this.lineThickness;
box.Margin = new Thickness((uint)(face.FaceBox.X + 70), (uint)(face.FaceBox.Y + 150), 0, 0);
this.VisualizationCanvas.Children.Add(box);
});
}
}
private async void FaceDetected(FaceDetectionEffect sender, FaceDetectedEventArgs args)
{
var previewStream = previewProperties as VideoEncodingProperties;
var dispatcher = Windows.ApplicationModel.Core.CoreApplication.MainView.CoreWindow.Dispatcher;
await dispatcher.RunAsync(Windows.UI.Core.CoreDispatcherPriority.Normal, () => {
a = camPreview.Width / previewStream.Width;
facesCanvas.Children.Clear();
//Detects faces in preview (without Project Oxford) and places a rectangle on them
foreach (Windows.Media.FaceAnalysis.DetectedFace face in args.ResultFrame.DetectedFaces)
{
Rectangle rect = new Rectangle()
{
Width = face.FaceBox.Width *a,
Height = face.FaceBox.Height *a,
Stroke = new SolidColorBrush(Windows.UI.Colors.Red),
StrokeThickness = 2.0
};
facesCanvas.Children.Add(rect);
Canvas.SetLeft(rect, camPreview.Width - (face.FaceBox.X *a) - rect.Width);
Canvas.SetTop(rect, face.FaceBox.Y *a);
}
});
}
private async void FaceDetectionEffect_FaceDetected(FaceDetectionEffect sender, FaceDetectedEventArgs args)
{
if (args.ResultFrame.DetectedFaces.Any())
{
var biggestFace = args.ResultFrame.DetectedFaces.OrderByDescending(f => f.FaceBox.Height * f.FaceBox.Width).FirstOrDefault();
if (biggestFace != null)
{
var faceBounds = new BitmapBounds
{
X = biggestFace.FaceBox.X,
Y = biggestFace.FaceBox.Y,
Height = biggestFace.FaceBox.Height,
Width = biggestFace.FaceBox.Width
};
// Check if face is not too big for face bounding box extrapolation
if (false == TryExtendFaceBounds(
(int)_previewProperties.Width, (int)_previewProperties.Height,
Constants.FaceBoxRatio, ref faceBounds))
{
return;
}
}
// Ask the UI thread to render the face bounding boxes
await Dispatcher.RunAsync(CoreDispatcherPriority.Normal, () => HighlightDetectedFaces(args.ResultFrame.DetectedFaces));
FaceDetected?.Invoke(sender, args);
if (IsCheckSmileEnabled)
{
await Dispatcher.RunAsync(CoreDispatcherPriority.Normal, async() => await CheckSmileAsync());
}
}
}
/// <summary>
/// Asynchronously start face detection
/// </summary>
public async Task <bool> StartFaceDetectionAsync(int detectionInterval)
{
if (!FaceDetector.IsSupported)
{
Debug.WriteLine("Face detection is not supported on this device");
return(false);
}
if (FaceDetectionEffect == null)
{
var definition = new FaceDetectionEffectDefinition
{
DetectionMode = FaceDetectionMode.HighQuality,
SynchronousDetectionEnabled = false
};
FaceDetectionEffect = (FaceDetectionEffect)await MediaCapture.AddVideoEffectAsync
(definition, MediaStreamType.VideoPreview);
}
FaceDetectionEffect.DesiredDetectionInterval = TimeSpan.FromMilliseconds(detectionInterval);
FaceDetectionEffect.Enabled = true;
return(true);
}
private async void FaceDetectionEffect_FaceDetected(FaceDetectionEffect sender, FaceDetectedEventArgs args)
{
// Ask the UI thread to render the face bounding boxes
var detectedFaces = args.ResultFrame.DetectedFaces;
Debug.WriteLine(detectedFaces.Count);
await Dispatcher.RunAsync(CoreDispatcherPriority.Normal, () => HighlightDetectedFaces(detectedFaces));
}
private async void btnStopDetection_Click(object sender, RoutedEventArgs e)
{
this.cvsFaceOverlay.Children.Clear();
_faceDetectionEffect.Enabled = false;
_faceDetectionEffect.FaceDetected -= FaceDetectionEffect_FaceDetected;
await _mediaCapture.ClearEffectsAsync(MediaStreamType.VideoPreview);
_faceDetectionEffect = null;
}
private void FaceDetectionEffect_FaceDetected(FaceDetectionEffect sender, FaceDetectedEventArgs args)
{
//Debug.WriteLine("Faces: {0}", args.ResultFrame.DetectedFaces.Count);
var nothing = Dispatcher.RunAsync(Windows.UI.Core.CoreDispatcherPriority.Normal, () =>
{
(DataContext as MainPageViewModel).OneFacePresent = (args.ResultFrame.DetectedFaces.Count == 1);
});
}
private async void FaceStopDetect()
{
_faceDetectionEffect.Enabled = false;
_faceDetectionEffect.FaceDetected -= FaceDetectionEffect_FaceDetected;
await _mediaCapture.ClearEffectsAsync(MediaStreamType.VideoPreview);
_faceDetectionEffect = null; this.cvsFaceOverlay.Children.Clear();
this.cvsFaceOverlay.Children.Clear();
}
// stop face detection
public async void StopDetect()
{
this._faceDetectionEffect.Enabled = false;
this._faceDetectionEffect.FaceDetected -= FaceDetectionEffect_FaceDetected;
this._faceDetectionEffect = null;
await this._mediaCapture.ClearEffectsAsync(MediaStreamType.VideoPreview);
// uninnitialize camera
await this.CleanupCameraAsync();
}
/// <summary>
/// Asynchronously stop face detection
/// </summary>
public async Task StopFaceDetectionAsync()
{
if (FaceDetectionEffect != null)
{
FaceDetectionEffect.Enabled = false;
await MediaCapture.ClearEffectsAsync(MediaStreamType.VideoPreview);
FaceDetectionEffect = null;
}
}
/// <summary>
/// Initializes the camera.
/// Will raise `CameraInit*` events.
/// </summary>
/// <returns>Task.</returns>
public async Task InitializeCameraAsync(Size previewControlSize)
{
// Set ui-related values.
this.previewControlSize = previewControlSize;
// Ensure that the media capture hasn't been init, yet.
if (MediaCapture != null)
{
return;
}
// Get all camera devices.
var devices = await DeviceInformation.FindAllAsync(DeviceClass.VideoCapture);
// Ensure there has been exactly one camera found.
if (devices.Count != 1)
{
IsFaceDetectionControlAvailable = false;
CameraInitFailed(this, new MessageEventArgs("No or more than one camera found. No face detection available."));
}
// Create new media capture instance.
MediaCapture = new MediaCapture();
// Setup callbacks.
MediaCapture.Failed += MediaCapture_Failed;
// Init the actual capturing.
var settings = new MediaCaptureInitializationSettings {
VideoDeviceId = devices[0].Id
};
await MediaCapture.InitializeAsync(settings);
// Updated preview properties from mediaCapture.
previewProperties = MediaCapture
.VideoDeviceController
.GetMediaStreamProperties(MediaStreamType.VideoPreview)
as VideoEncodingProperties;
// Setup face detection
var definition = new FaceDetectionEffectDefinition
{
SynchronousDetectionEnabled = false,
DetectionMode = FaceDetectionMode.HighPerformance
};
faceDetectionEffect = (FaceDetectionEffect)await MediaCapture.AddVideoEffectAsync(definition, MediaStreamType.VideoPreview);
faceDetectionEffect.DesiredDetectionInterval = TimeSpan.FromMilliseconds(33);
faceDetectionEffect.FaceDetected += FaceDetectionEffect_FaceDetected;
// Operation was successful.
IsFaceDetectionControlAvailable = true;
CameraInitSucceeded(this, new MessageEventArgs("Face detection is now available."));
}
/// <summary>
/// Handle a face detected event
/// </summary>
/// <param name="sender"></param>
/// <param name="args"></param>
private async void FaceDetectionEffect_FaceDetected(FaceDetectionEffect sender, FaceDetectedEventArgs args)
{
// Only run one face detection call to Cognitive Services at a time
if (!_isRecognizing)
{
//If we need the box for the detected face we can get them here
//foreach (Windows.Media.FaceAnalysis.DetectedFace face in args.ResultFrame.DetectedFaces)
//{
// BitmapBounds faceRect = face.FaceBox;
//}
_isRecognizing = true;
var lowLagCapture = await _mediaCapture.PrepareLowLagPhotoCaptureAsync(ImageEncodingProperties.CreateUncompressed(MediaPixelFormat.Bgra8));
var capturedPhoto = await lowLagCapture.CaptureAsync();
var softwareBitmap = capturedPhoto.Frame.SoftwareBitmap;
await lowLagCapture.FinishAsync();
using (IRandomAccessStream randomAccessStream = new InMemoryRandomAccessStream())
{
BitmapEncoder encoder = await BitmapEncoder.CreateAsync(BitmapEncoder.JpegEncoderId, randomAccessStream);
encoder.SetSoftwareBitmap(softwareBitmap);
await encoder.FlushAsync();
var stream = randomAccessStream.AsStreamForRead();
try
{
//This call the Cognitive Services face API to detect the faces
var faces = await FaceService.DetectAsync(stream, true, false);
List <Guid> faceList = new List <Guid>();
foreach (var face in faces)
{
faceList.Add(face.FaceId);
}
LastFaces = faceList.ToArray();
}
catch
{
//We could not detect faces using Cognitive Services
}
}
_isRecognizing = false;
}
}
private async void FaceDetectionEffect_FaceDetected(FaceDetectionEffect sender, FaceDetectedEventArgs args)
{
if (!_displayFaces)
{
return;
}
await Dispatcher.RunAsync(CoreDispatcherPriority.Normal, () =>
{
RenderFaceRectangles(args.ResultFrame.DetectedFaces.ToList());
});
}
// method to handle face postion detection
private void FaceDetectionEffect_FaceDetected(FaceDetectionEffect sender, FaceDetectedEventArgs args)
{
var detectedFaces = args.ResultFrame.DetectedFaces;
FaceDetectEventArgs argument = new FaceDetectEventArgs(detectedFaces);
if (OnDetectFace == null)
{
return;
}
OnDetectFace(this, argument);
}
private async void FaceDetectionEffect_FaceDetected(FaceDetectionEffect sender, FaceDetectedEventArgs args)
{
// Billy Action: Add heart eyes
if (args.ResultFrame.DetectedFaces.Count > 0)
{
ShowLoveEyes();
}
// Ask the UI thread to render the face bounding boxes
// await Dispatcher.RunAsync(CoreDispatcherPriority.Normal, () => HighlightDetectedFaces(args.ResultFrame.DetectedFaces));
}
private async void FaceDetectionEffect_FaceDetected(FaceDetectionEffect sender, FaceDetectedEventArgs args)
{
if (!_displayFaceFrames && !_displayFaceHat)
{
return;
}
// Use the dispatcher because this method is sometimes called from non-UI threads
await Dispatcher.RunAsync(CoreDispatcherPriority.Normal, () =>
{
RenderFaceRectangles(args.ResultFrame.DetectedFaces.ToList());
});
}
private async void FaceDetect()
{
var faceDetectionDefinition = new FaceDetectionEffectDefinition();
faceDetectionDefinition.DetectionMode = FaceDetectionMode.Balanced;
faceDetectionDefinition.SynchronousDetectionEnabled = false;
_faceDetectionEffect = (FaceDetectionEffect)await _mediaCapture.AddVideoEffectAsync(faceDetectionDefinition, MediaStreamType.VideoPreview);
_faceDetectionEffect.FaceDetected += FaceDetectionEffect_FaceDetected;
_faceDetectionEffect.DesiredDetectionInterval = TimeSpan.FromMilliseconds(33);
_faceDetectionEffect.Enabled = true;
}
private void FaceDetectionEffect_FaceDetected(FaceDetectionEffect sender, FaceDetectedEventArgs args)
{
foreach (Windows.Media.FaceAnalysis.DetectedFace face in args.ResultFrame.DetectedFaces)
{
_ = Dispatcher.RunAsync(CoreDispatcherPriority.Normal, () => {
txtFaceDetected.Text = "Face has been detected!";
txtFaceDetected.FontWeight = Windows.UI.Text.FontWeights.Bold;
txtFaceDetected.Foreground = new SolidColorBrush(Windows.UI.Colors.SteelBlue);
ActuateHardware();
});
}
}
private async Task CreateFaceDetectionEffectAsync()
{
// Create the definition, which will contain some initialization settings
var definition = new FaceDetectionEffectDefinition();
// To ensure preview smoothness, do not delay incoming samples
definition.SynchronousDetectionEnabled = false;
// In this scenario, choose detection speed over accuracy
definition.DetectionMode = FaceDetectionMode.HighPerformance;
// Add the effect to the preview stream
_faceDetectionEffect = (FaceDetectionEffect)await _mediaCapture.AddVideoEffectAsync(definition, MediaStreamType.VideoPreview);
// Register for face detection events
_faceDetectionEffect.FaceDetected += HandleFaceDetectionEffectFaceDetected;
// Choose the shortest interval between detection events
_faceDetectionEffect.DesiredDetectionInterval = TimeSpan.FromMilliseconds(200);
// Start detecting faces
_faceDetectionEffect.Enabled = true;
}
private async void HandleFaceDetectionEffectFaceDetected(FaceDetectionEffect sender, FaceDetectedEventArgs args)
{
if(_faceInView)
{
return;
}
_faceInView = true;
await TakePhotoAsync();
await AnalyzePhotoAsync();
}
public FaceDetectionEffectEvents(FaceDetectionEffect This)
{
this.This = This;
}
/// <summary>
/// Disables and removes the face detection effect, and unregisters the event handler for face detection
/// </summary>
/// <returns></returns>
private async Task CleanUpFaceDetectionEffectAsync()
{
// Disable detection
_faceDetectionEffect.Enabled = false;
// Unregister the event handler
_faceDetectionEffect.FaceDetected -= FaceDetectionEffect_FaceDetected;
// Remove the effect (see ClearEffectsAsync method to remove all effects from a stream)
await _mediaCapture.RemoveEffectAsync(_faceDetectionEffect);
// Clear the member variable that held the effect instance
_faceDetectionEffect = null;
}
private async void FaceDetectionEffect_FaceDetected(FaceDetectionEffect sender, FaceDetectedEventArgs args)
{
Debug.WriteLine("Face number: {0}", args.ResultFrame.DetectedFaces.Count);
// Ask the UI thread to render the face bounding boxes
await Dispatcher.RunAsync(CoreDispatcherPriority.Normal, () => HighlightDetectedFaces(args.ResultFrame.DetectedFaces));
///检测到人脸，上传到服务器。
///
try
{
if (args.ResultFrame.DetectedFaces.Count > faceNumber )
{
faceNumber = args.ResultFrame.DetectedFaces.Count;
await SendPhotoAsync();
}
else
{
faceNumber = args.ResultFrame.DetectedFaces.Count;
}
//
}
catch (Exception ex)
{
Debug.WriteLine("Exception when sending a photo: {0}", ex.ToString());
}
;
}
private async void FaceDetectionEffect_FaceDetected(FaceDetectionEffect sender, FaceDetectedEventArgs args)
{
// Ask the UI thread to render the face count information
await _dispatcher.RunAsync(CoreDispatcherPriority.Normal, () => CountDetectedFaces(args.ResultFrame.DetectedFaces));
}
private async void FaceDetectionEffect_FaceDetected(FaceDetectionEffect sender, FaceDetectedEventArgs args)
{
// Ask the UI thread to render the face bounding boxes
await Dispatcher.RunAsync(CoreDispatcherPriority.Normal, () => HighlightDetectedFaces(args.ResultFrame.DetectedFaces));
}
/// <summary>
/// Disables and removes the face detection effect, and unregisters the event handler for face detection
/// </summary>
/// <returns></returns>
private async Task CleanUpFaceDetectionEffectAsync()
{
// Disable detection
_faceDetectionEffect.Enabled = false;
// Unregister the event handler
_faceDetectionEffect.FaceDetected -= FaceDetectionEffect_FaceDetected;
// Remove the effect from the preview stream
await _mediaCapture.ClearEffectsAsync(MediaStreamType.VideoPreview);
// Clear the member variable that held the effect instance
_faceDetectionEffect = null;
}
private async void FaceDetectionEffect_FaceDetected(FaceDetectionEffect sender, FaceDetectedEventArgs args)
{
await Dispatcher.RunAsync(CoreDispatcherPriority.Normal, () => HighlightDetectedFaces(args.ResultFrame.DetectedFaces));
if (launcher == null)
return;
await launcher.SetLightAsync(left | right | up | down);
if (left)
await launcher.MoveLeftAsync(5);
if (right)
await launcher.MoveRightAsync(5);
if (down)
await launcher.MoveDownAsync(5);
if (up)
await launcher.MoveUpAsync(5);
if (visible && !up && !down && !left && !right)
await launcher.FireAsync();
}