/// <summary>
/// Function to update the list of Face IDs, based on the example images added
/// </summary>
private async void UpdateFaceGuidsAsync()
{
if (!_faceListExists)
{
return;
}
try
{
FaceList faceList = await _faceServiceClient.GetFaceListAsync(FaceListName.ToLower());
if (faceList == null)
{
return;
}
PersistedFace[] faces = faceList.PersistedFaces;
foreach (PersistedFace face in faces)
{
FaceIds.Add(face.PersistedFaceId);
}
}
catch (FaceAPIException ex)
{
Debug.WriteLine($"Failed to get face list - {ex.ErrorMessage}");
}
catch (Exception ex)
{
Debug.WriteLine(ex.Message);
}
}
/// <summary>
/// Function to add example faces to a given face list. Will loop through a folder and add all image files in that folder
/// </summary>
/// <param name="obj"></param>
private async void AddExampleFacesToList(object obj)
{
string personGroupDirectory = Path.Combine(Environment.CurrentDirectory, "PersonGroup");
string[] images = GetImageFiles(personGroupDirectory);
try
{
foreach (string image in images)
{
using (Stream fileStream = File.OpenRead(image))
{
Face[] faces = await _faceServiceClient.DetectAsync(fileStream);
FaceRectangle faceRectangle = faces[0].FaceRectangle;
AddPersistedFaceResult addFacesResult =
await _faceServiceClient.AddFaceToFaceListAsync(
FaceListName.ToLower(),
fileStream, null, faceRectangle);
UpdateFaceGuidsAsync();
}
}
}
catch (FaceAPIException ex)
{
Debug.WriteLine($"Failed to add faces to face list: {ex.ErrorMessage}");
}
catch (Exception ex)
{
Debug.WriteLine(ex.Message);
}
}
/// <summary>
/// Function to create new face list
/// </summary>
/// <param name="obj"></param>
private async void CreateFaceListAsync(object obj)
{
try
{
if (!_faceListExists)
{
await _faceServiceClient.CreateFaceListAsync(FaceListName.ToLower(), FaceListName, string.Empty);
await DoesFaceListExistAsync();
}
}
catch (FaceAPIException ex)
{
Debug.WriteLine($"Failed to create face list - {ex.ErrorMessage}");
}
catch (Exception ex)
{
Debug.WriteLine(ex.Message);
}
}
/// <summary>
/// Function to find similar faces. Will first detect any faces in the given photo, and use this result for the similar faces search
/// </summary>
/// <param name="obj"></param>
private async void FindSimilarFace(object obj)
{
if (!_faceListExists || FaceIds.Count == 0)
{
SimilarResult = "Face list does not exist";
}
Guid findFaceGuid = await BrowseAndDetectFaces();
if (findFaceGuid.Equals(Guid.Empty))
{
return;
}
try
{
SimilarPersistedFace[] similarFaces = await _faceServiceClient.FindSimilarAsync(findFaceGuid, FaceListName.ToLower(), 3);
if (similarFaces == null || similarFaces.Length == 0)
{
SimilarResult = "No faces were similar";
}
StringBuilder result = new StringBuilder();
result.Append("Similar faces:\n");
if (similarFaces.Length == 0)
{
result.Append("No similar faces found");
}
foreach (SimilarPersistedFace similarFace in similarFaces)
{
result.AppendFormat("Face ID: {0}\n", similarFace.PersistedFaceId);
result.AppendFormat("Probability: {0}\n\n", similarFace.Confidence);
}
SimilarResult = result.ToString();
}
catch (Exception ex)
{
Debug.WriteLine(ex.Message);
}
}