public async Task DescribeImageAsync()
{
IsBusy = true;
StatusMessage = null;
string baseDescription = null;
string facesRecognizedDescription = null;
string emotionDescription = null;
MessengerInstance.Send(new NotificationMessage(Constants.TakingPhoto));
try
{
StatusMessage = AppResources.QueryingVisionService;
using (var stream = await streamingService.GetCurrentFrameAsync())
{
if (stream != null)
{
var imageBytes = await stream.ToArrayAsync();
MessengerInstance.Send(new NotificationMessage <byte[]>(imageBytes, Constants.PhotoTaken));
if (await Network.IsInternetAvailableAsync())
{
var result = await cognitiveClient.RecognizeAsync(stream, Language, RecognitionType.Vision | RecognitionType.Emotion, OnRecognitionProgress);
var visionResult = result.VisionResult;
if (visionResult.IsValid)
{
baseDescription = visionResult.Description;
if (visionResult.IsTranslated)
{
if (Settings.ShowOriginalDescriptionOnTranslation)
{
baseDescription = $"{visionResult.TranslatedDescription} ({visionResult.Description})";
}
else
{
baseDescription = visionResult.TranslatedDescription;
}
}
if (Settings.ShowDescriptionConfidence)
{
baseDescription = $"{baseDescription} ({Math.Round(visionResult.Confidence, 2)})";
}
// Analyzes emotion results.
var emotionResults = result.EmotionResults;
if (emotionResults.Any())
{
var emotionMessages = new StringBuilder();
foreach (var emotionResult in emotionResults)
{
var emotionMessage = SpeechHelper.GetEmotionMessage(emotionResult.Gender, emotionResult.Age, emotionResult.Emotion);
if (!string.IsNullOrWhiteSpace(emotionMessage))
{
emotionMessages.Append(emotionMessage);
}
}
// Describes how many faces have been recognized.
if (emotionResults.Count() == 1)
{
facesRecognizedDescription = AppResources.FaceRecognizedSingular;
}
else
{
facesRecognizedDescription = $"{string.Format(AppResources.FacesRecognizedPlural, emotionResults.Count())} {Constants.SentenceEnd}";
}
emotionDescription = emotionMessages.ToString();
}
}
else
{
if (Settings.ShowRawDescriptionOnInvalidRecognition && visionResult.RawDescription != null)
{
baseDescription = $"{AppResources.RecognitionFailed} ({visionResult.RawDescription}, {Math.Round(visionResult.Confidence, 2)})";
}
else
{
baseDescription = AppResources.RecognitionFailed;
}
}
}
else
{
// Connection isn't available, the service cannot be reached.
baseDescription = AppResources.NoConnection;
}
}
else
{
baseDescription = AppResources.UnableToTakePhoto;
}
}
}
catch (Microsoft.ProjectOxford.Vision.ClientException)
{
// Unable to access the service (tipically, due to invalid registration keys).
baseDescription = AppResources.UnableToAccessService;
}
catch (Microsoft.ProjectOxford.Common.ClientException ex) when(ex.Error.Code.ToLower() == "unauthorized")
{
// Unable to access the service (tipically, due to invalid registration keys).
baseDescription = AppResources.UnableToAccessService;
}
catch (WebException)
{
// Internet isn't available, the service cannot be reached.
baseDescription = AppResources.NoConnection;
}
catch (Exception ex)
{
var error = AppResources.RecognitionError;
if (Settings.ShowExceptionOnError)
{
error = $"{error} ({ex.Message})";
}
baseDescription = error;
}
// Shows and speaks the result.
var message = $"{baseDescription}{Constants.SentenceEnd} {facesRecognizedDescription} {emotionDescription}";
StatusMessage = this.GetNormalizedMessage(message);
await SpeechHelper.TrySpeechAsync(message);
IsBusy = false;
}
private async Task TakePhotoAsync()
{
IsBusy = true;
string recognizeText = null;
try
{
using (var stream = await mediaPicker.TakePhotoAsync())
{
if (stream != null)
{
var imageBytes = await stream.ToArrayAsync();
MessengerInstance.Send(new NotificationMessage <byte[]>(imageBytes, Constants.PhotoTaken));
Message = null;
if (await Network.IsInternetAvailableAsync())
{
var result = await cognitiveClient.RecognizeAsync(stream, Language, RecognitionType.Text);
var ocrResult = result.OcrResult;
if (ocrResult.IsValid)
{
recognizeText = ocrResult.Text;
}
else
{
recognizeText = AppResources.UnableToRecognizeText;
}
}
else
{
// Internet isn't available, the service cannot be reached.
recognizeText = AppResources.NoConnection;
}
}
else
{
// If message is null at this point, this is the first request. If we cancel it, turns automatically to the
// previous page.
if (message == null)
{
Navigator.GoBack();
}
IsBusy = false;
return;
}
}
}
catch (WebException)
{
// Internet isn't available, the service cannot be reached.
recognizeText = AppResources.NoConnection;
}
catch (ClientException)
{
// Unable to access the service (tipically, due to invalid registration keys).
recognizeText = AppResources.UnableToAccessService;
}
catch (Exception ex)
{
var error = AppResources.RecognitionError;
if (Settings.ShowExceptionOnError)
{
error = $"{error} ({ex.Message})";
}
recognizeText = error;
}
// Shows the result.
Message = this.GetNormalizedMessage(recognizeText);
IsBusy = false;
}