public async Task <CognitiveResult> AnalyzeAsync(Stream stream, string language, RecognitionType recognitionType = RecognitionType.All, Func <RecognitionPhase, Task> onProgress = null)
{
var result = new CognitiveResult();
var imageBytes = await stream.ToArrayAsync();
await RaiseOnProgressAsync(onProgress, RecognitionPhase.QueryingService);
var visionService = new VisionServiceClient(Settings.VisionSubscriptionKey);
AnalysisResult analyzeImageResult = null;
if (recognitionType.HasFlag(RecognitionType.Vision))
{
var features = new HashSet <VisualFeature> {
VisualFeature.Description
};
if (recognitionType.HasFlag(RecognitionType.Face) || recognitionType.HasFlag(RecognitionType.Emotion))
{
// If recognition types include face or emotions, add also the Faces Visual Feature, so Face and Emotion services are called
// only if really needed.
features.Add(VisualFeature.Faces);
}
try
{
analyzeImageResult = await visionService.AnalyzeImageAsync(stream, features);
}
catch (ClientException ex)
{
var exception = await CreateExceptionAsync(ex.Error.Code, ex.Error.Message, "Vision", ex.GetHttpStatusCode(), ex, language, onProgress);
throw exception;
}
Caption originalDescription;
Caption filteredDescription;
var visionSettings = VisionSettingsProvider != null ? await VisionSettingsProvider.GetSettingsAsync() : null;
var isValid = analyzeImageResult.IsValid(out originalDescription, out filteredDescription, visionSettings);
var visionResult = result.VisionResult;
visionResult.IsValid = isValid;
visionResult.RawDescription = originalDescription.Text;
visionResult.Confidence = originalDescription.Confidence;
if (isValid)
{
visionResult.Description = filteredDescription.Text;
visionResult.TranslatedDescription = await TranslateAsync(filteredDescription.Text, language, onProgress);
}
}
if ((recognitionType.HasFlag(RecognitionType.Face) || recognitionType.HasFlag(RecognitionType.Emotion)) &&
(analyzeImageResult?.Faces.Any() ?? true)) // If Vision service was previously called, checks if any face was detected.
{
var faceService = new FaceServiceClient(Settings.FaceSubscriptionKey);
await RaiseOnProgressAsync(onProgress, RecognitionPhase.RecognizingFaces);
try
{
stream.Position = 0;
var attributes = new HashSet <FaceAttributeType> {
FaceAttributeType.Gender, FaceAttributeType.Age
};
if (recognitionType.HasFlag(RecognitionType.Emotion))
{
// If recognition types include emotions, add also the Emotion Face Attribute Type, so this feature is called
// only if really needed.
attributes.Add(FaceAttributeType.Emotion);
}
var faces = await faceService.DetectAsync(stream, returnFaceAttributes : attributes);
if (faces.Any())
{
if (!faceServiceInitialized)
{
// If necessary, initializes face service by obtaining the face group used for identification, if any.
await InitializeFaceServiceAsync(faceService);
}
// Tries to identify faces in the image.
IdentifyResult[] faceIdentificationResult = null;
if (!string.IsNullOrWhiteSpace(identifyPersonGroupId))
{
var faceIds = faces.Select(face => face.FaceId).ToArray();
faceIdentificationResult = await faceService.IdentifyAsync(identifyPersonGroupId, faceIds);
}
var faceTasks = new List <Task>();
foreach (var face in faces)
{
await RaiseOnProgressAsync(onProgress, RecognitionPhase.RecognizingFaces);
// Runs face identification in parallel.
var task = Task.Run(async() =>
{
var faceResult = face.GetFaceResult();
// Checks if there is a candidate (i.e. a known person) in the identification result.
var candidate = faceIdentificationResult?.FirstOrDefault(r => r.FaceId == face.FaceId)?.Candidates.FirstOrDefault();
if (candidate != null)
{
// Gets the person name.
var person = await faceService.GetPersonAsync(identifyPersonGroupId, candidate.PersonId);
faceResult.IdentifyConfidence = candidate.Confidence;
faceResult.Name = person?.Name;
}
result.FaceResults.Add(faceResult);
});
faceTasks.Add(task);
}
await Task.WhenAll(faceTasks);
}
}
catch (FaceAPIException ex)
{
var exception = await CreateExceptionAsync(ex.ErrorCode, ex.ErrorMessage, "Face", ex.HttpStatus, ex, language, onProgress);
throw exception;
}
}
if (recognitionType.HasFlag(RecognitionType.Text))
{
await RaiseOnProgressAsync(onProgress, RecognitionPhase.RecognizingText);
try
{
using (var ms = new MemoryStream(imageBytes))
{
var results = await visionService.RecognizeTextAsync(ms);
var text = results.GetRecognizedText();
result.OcrResult.Text = text;
}
}
catch (Microsoft.ProjectOxford.Vision.ClientException ex)
{
var exception = await CreateExceptionAsync(ex.Error.Code, ex.Error.Message, "Vision", ex.GetHttpStatusCode(), ex, language, onProgress);
throw exception;
}
}
return(result);
}