private async void ConfirmButton_Click(object sender, RoutedEventArgs e)
{
if (!string.IsNullOrWhiteSpace(UserNameBox.Text))
{
// Create or open the folder in which the Whitelist is stored
StorageFolder whitelistFolder = await KnownFolders.PicturesLibrary.CreateFolderAsync(GeneralConstants.WhiteListFolderName, CreationCollisionOption.OpenIfExists);
// Create a folder to store this specific user's photos
StorageFolder currentFolder = await whitelistFolder.CreateFolderAsync(UserNameBox.Text, CreationCollisionOption.ReplaceExisting);
// Move the already captured photo the user's folder
await currentIdPhotoFile.MoveAsync(currentFolder);
// Add user to Oxford database
OxfordFaceAPIHelper.AddUserToWhitelist(UserNameBox.Text, currentFolder);
// Stop live camera feed
await webcam.StopCameraPreview();
var parameters = new NewUserPage
{
Dummy = ((Button)sender).Name.ToString(),
ToWelcome = "true",
UserName = UserNameBox.Text
};
// Navigate back to MainPage
this.Frame.Navigate(typeof(MainPage), parameters);
}
}
/// <summary>
/// Called once, when the app is first opened. Initializes Oxford facial recognition.
/// </summary>
public async void InitializeOxford()
{
// initializedOxford bool will be set to true when Oxford has finished initialization successfully
initializedOxford = await OxfordFaceAPIHelper.InitializeOxford();
// Populates UI grid with whitelisted visitors
UpdateWhitelistedVisitors();
}
public async Task CapturePhoto()
{
await webcam.InitializeCameraAsync();
if (!webcam.IsInitialized())
{
Debug.WriteLine("Not initialied");
}
StorageFile image = await webcam.CapturePhoto();
try
{
// Oxford determines whether or not the visitor is on the Whitelist and returns true if so
recognizedVisitors = await OxfordFaceAPIHelper.IsFaceInWhitelist(image);
}
catch (FaceRecognitionException fe)
{
switch (fe.ExceptionType)
{
// Fails and catches as a FaceRecognitionException if no face is detected in the image
case FaceRecognitionExceptionType.NoFaceDetected:
Debug.WriteLine("WARNING: No face detected in this image.");
break;
}
}
catch (FaceAPIException faceAPIEx)
{
Debug.WriteLine("FaceAPIException in IsFaceInWhitelist(): " + faceAPIEx.ErrorMessage);
}
catch
{
// General error. This can happen if there are no visitors authorized in the whitelist
Debug.WriteLine("WARNING: Oxford just threw a general expception.");
}
if (recognizedVisitors.Count > 0)
{
// If everything went well and a visitor was recognized, unlock the door:
Ledpin.Write(GpioPinValue.Low);
}
else
{
// Create or open the folder in which the Whitelist is stored
StorageFolder folder = await KnownFolders.PicturesLibrary.CreateFolderAsync("Banned", CreationCollisionOption.OpenIfExists);
// Move the already captured photo the user's folder
await image.MoveAsync(folder);
var model = new Models.Database.Ban()
{
Image = image.Name,
Time = DateTime.Now
};
Ledpin.Write(GpioPinValue.High);
database.InsertModel <Models.Database.Ban>(model);
}
isCapturing = false;
}
/// <summary>
/// Triggered when the user clicks the add photo button located in the app bar
/// </summary>
private async void AddButton_Tapped(object sender, TappedRoutedEventArgs e)
{
// Captures photo from current webcam stream
StorageFile imageFile = await webcam.CapturePhoto();
// Moves the captured file to the current user's ID image folder
await imageFile.MoveAsync(currentUser.ImageFolder);
// Update photo grid
PopulatePhotoGrid();
// Add to Oxford
OxfordFaceAPIHelper.AddImageToWhitelist(imageFile, currentUser.Name);
}
/// <summary>
/// Triggered when the user clicks the delete user button located in the app bar
/// </summary>
private async void DeleteButton_Tapped(object sender, TappedRoutedEventArgs e)
{
// Delete the user's folder
await currentUser.ImageFolder.DeleteAsync();
// Remove user from Oxford
OxfordFaceAPIHelper.RemoveUserFromWhitelist(currentUser.Name);
// Stop camera preview
await webcam.StopCameraPreview();
// Navigate to MainPage
Frame.Navigate(typeof(MainPage));
}
/// <summary>
/// Called once, when the app is first opened. Initializes Oxford facial recognition.
/// </summary>
public async void InitializeOxford()
{
// initializedOxford bool will be set to true when Oxford has finished initialization successfully
initializedOxford = await OxfordFaceAPIHelper.InitializeOxford(this.speech);
// Populates UI grid with whitelisted visitors
UpdateWhitelistedVisitors();
if (initializedOxford)
{
this.imageFromCameraWithFaces.PerformRecognition = true;
await speech.Read("Система распознавания лиц инициализирована успешно.");
this.cameraControl.EnableAutoCaptureMode = true;
this.cameraControl.FilterOutSmallFaces = true;
this.cameraControl.AutoCaptureStateChanged += CameraControl_AutoCaptureStateChanged;
this.cameraControl.CameraAspectRatioChanged += CameraControl_CameraAspectRatioChanged;
// this.cameraControl.CameraRestarted += CameraControl_CameraRestarted;
// If user has set the DisableLiveCameraFeed within Constants.cs to true, disable the feed:
if (GeneralConstants.DisableLiveCameraFeed)
{
cameraHostGrid.Visibility = Visibility.Collapsed;
DisabledFeedGrid.Visibility = Visibility.Visible;
}
else
{
cameraHostGrid.Visibility = Visibility.Visible;
DisabledFeedGrid.Visibility = Visibility.Collapsed;
}
}
else
{
await speech.Read("Ошибка инициализации системы распознавания лиц.");
}
}
/// <summary>
/// Called when user hits physical or vitual doorbell buttons. Captures photo of current webcam view and sends it to Oxford for facial recognition processing.
/// </summary>
private async Task DoorbellPressed()
{
// Display analysing visitors grid to inform user that doorbell press was registered
AnalysingVisitorGrid.Visibility = Visibility.Visible;
// List to store visitors recognized by Oxford Face API
// Count will be greater than 0 if there is an authorized visitor at the door
List <string> recognizedVisitors = new List <string>();
// Confirms that webcam has been properly initialized and oxford is ready to go
if (webcam.IsInitialized() && initializedOxford)
{
// Stores current frame from webcam feed in a temporary folder
StorageFile image = await webcam.CapturePhoto();
try
{
// Oxford determines whether or not the visitor is on the Whitelist and returns true if so
recognizedVisitors = await OxfordFaceAPIHelper.IsFaceInWhitelist(image);
}
catch (FaceRecognitionException fe)
{
switch (fe.ExceptionType)
{
// Fails and catches as a FaceRecognitionException if no face is detected in the image
case FaceRecognitionExceptionType.NoFaceDetected:
Debug.WriteLine("WARNING: No face detected in this image.");
break;
}
}
catch (FaceAPIException faceAPIEx)
{
Debug.WriteLine("FaceAPIException in IsFaceInWhitelist(): " + faceAPIEx.ErrorMessage);
}
catch
{
// General error. This can happen if there are no visitors authorized in the whitelist
Debug.WriteLine("WARNING: Oxford just threw a general expception.");
}
if (recognizedVisitors.Count > 0)
{
// If everything went well and a visitor was recognized, unlock the door:
AuthenticateUser(recognizedVisitors[0]);
}
else
{
// Otherwise, inform user that they were not recognized by the system
await speech.Read(SpeechContants.VisitorNotRecognizedMessage);
}
}
else
{
if (!webcam.IsInitialized())
{
// The webcam has not been fully initialized for whatever reason:
Debug.WriteLine("Unable to analyze visitor at door as the camera failed to initlialize properly.");
await speech.Read(SpeechContants.NoCameraMessage);
}
if (!initializedOxford)
{
// Oxford is still initializing:
Debug.WriteLine("Unable to analyze visitor at door as Oxford Facial Recogntion is still initializing.");
}
}
doorbellJustPressed = false;
AnalysingVisitorGrid.Visibility = Visibility.Collapsed;
}
