async void OnIdentifyUser(object sender, RoutedEventArgs e)
{
await this.cameraDisplay.TakePhotoAsync();
// We ask Oxford to detect, it will store the face for 24 hours and
// will give us an Id to use.
var detectedFaceId = await this.DetectFirstFaceInCapturedPhotoAsync();
if (detectedFaceId != Guid.Empty)
{
var personGroupId = await this.CreateOrGetPersonGroupAsync("MyPeople");
var results = await this.faceClient.IdentifyAsync(
personGroupId,
new Guid[] { detectedFaceId },
1); // only 1 candidate being asked for
if ((results == null) || (results.First().Candidates.Length == 0))
{
await this.MessageDialog("no results", "that didn't work - got zero results");
}
else
{
var candidate = results.First().Candidates[0];
var name = await AccountMap.GetNameForGuidAsync(candidate.PersonId);
this.cameraDisplay.ShowLegend($"We think this is {name}");
await Task.Delay(TimeSpan.FromSeconds(5));
}
this.cameraDisplay.ResetVisuals();
}
}
async void OnSubmitFaceForUser(object sender, RoutedEventArgs e)
{
await this.cameraDisplay.TakePhotoAsync();
// We can have many groups of up to 1000 members but we just hard-code
// a single group called 'MyPeople'.
var personGroupId = await this.CreateOrGetPersonGroupAsync(
"MyPeople");
// We then go to grab an id for a person with the right name in that
// group.
var personName = this.txtPersonName.Text;
var personId = await this.CreateOrGetPersonAsync(
personGroupId,
personName);
await AccountMap.SetNameForGuidAsync(personId, personName);
// We then register this face as belonging to that person in that
// group.
var result = await this.faceClient.AddPersonFaceAsync(
personGroupId.ToString(),
personId,
this.cameraDisplay.CapturedPhotoStream.AsStreamForRead());
this.cameraDisplay.ResetVisuals();
}