public async Task <List <string> > FaceRecognizeAsync(StorageFile imageFile)
{
var recogResult = new List <string>();
if (!FaceApiUtils.ValidateImageFile(imageFile))
{
throw new FaceRecognitionException(FaceRecognitionExceptionType.InvalidImage);
}
// detect all faces in the image
var faceIds = await DetectFacesFromImage(imageFile);
// try to identify all faces to person
var identificationResults = await _faceApiClient.IdentifyAsync(WhitelistId, faceIds);
// add identified person name to result list
foreach (var result in identificationResults)
{
if (result.Candidates.Length > 0)
{
var personName = _whitelist.GetPersonNameById(result.Candidates[0].PersonId);
Debug.WriteLine("Face ID Confidence: " + Math.Round(result.Candidates[0].Confidence * 100, 1) + "%");
recogResult.Add(personName);
}
}
return(recogResult);
}
public async Task <bool> RemoveImageFromWhitelistAsync(StorageFile imageFile, string personName = null)
{
bool isSuccess = true;
if (!FaceApiUtils.ValidateImageFile(imageFile))
{
isSuccess = false;
}
else
{
// If personName is null use the folder name as person name
if (string.IsNullOrEmpty(personName))
{
personName = await FaceApiUtils.GetParentFolderNameAsync(imageFile);
}
var personId = _whitelist.GetPersonIdByName(personName);
var faceId = _whitelist.GetFaceIdByFilePath(imageFile.Path);
if (personId == Guid.Empty || faceId == Guid.Empty)
{
isSuccess = false;
}
else
{
await RemoveFace(personId, faceId);
// train whitelist
isSuccess = await TrainingWhitelistAsync();
}
}
return(isSuccess);
}
/// <summary>
/// Detect face and return the face id of a image file
/// </summary>
/// <param name="imageFile">
/// image file to detect face
/// </param>
/// <returns>face id</returns>
private async Task <Guid[]> DetectFacesFromImage(StorageFile imageFile)
{
var stream = await imageFile.OpenStreamForReadAsync();
var faces = await _faceApiClient.DetectAsync(stream);
if (faces == null || faces.Length < 1)
{
throw new FaceRecognitionException(FaceRecognitionExceptionType.NoFaceDetected);
}
return(FaceApiUtils.FacesToFaceIds(faces));
}
public async Task <bool> AddImageToWhitelistAsync(StorageFile imageFile, string personName = null)
{
bool isSuccess = true;
// imageFile should be valid image file
if (!FaceApiUtils.ValidateImageFile(imageFile))
{
isSuccess = false;
}
else
{
var filePath = imageFile.Path;
// If personName is null/empty, use the folder name as person name
if (string.IsNullOrEmpty(personName))
{
personName = await FaceApiUtils.GetParentFolderNameAsync(imageFile);
}
// If person name doesn't exists, add it
var personId = _whitelist.GetPersonIdByName(personName);
if (personId == Guid.Empty)
{
var folder = await imageFile.GetParentAsync();
personId = await CreatePerson(personName, folder);
}
// detect faces
var faceId = await DetectFaceFromImage(imageFile);
await AddFace(personId, faceId, imageFile.Path);
// train whitelist
isSuccess = await TrainingWhitelistAsync();
}
return(isSuccess);
}
/// <summary>
/// Use whitelist folder to build whitelist Database
/// </summary>
/// <returns></returns>
private async Task BuildWhiteListAsync(IProgress <int> progress, double progressCnt)
{
Debug.WriteLine("Start building whitelist from " + _whitelistFolder.Path);
// calc progress step
var fileCnt = await FaceApiUtils.GetFileCountInWhitelist(_whitelistFolder);
var progressStep = (100.0 - progressCnt) / fileCnt;
var subFolders = await _whitelistFolder.GetFoldersAsync();
// Iterate all subfolders in whitelist
foreach (var folder in subFolders)
{
var personName = folder.Name;
// create new person
var personId = await CreatePerson(personName, folder);
// get all images in the folder
var files = await folder.GetFilesAsync();
// iterate all images and add to whitelist
foreach (var file in files)
{
Debug.WriteLine("BuildWhiteList: Processing " + file.Path);
try
{
var faceId = await DetectFaceFromImage(file);
await AddFace(personId, faceId, file.Path);
Debug.WriteLine("This image added to whitelist successfully!");
}
catch (FaceRecognitionException fe)
{
switch (fe.ExceptionType)
{
case FaceRecognitionExceptionType.InvalidImage:
Debug.WriteLine("WARNING: This file is not a valid image!");
break;
case FaceRecognitionExceptionType.NoFaceDetected:
Debug.WriteLine("WARNING: No face detected in this image");
break;
case FaceRecognitionExceptionType.MultipleFacesDetected:
Debug.WriteLine("WARNING: Multiple faces detected, ignored this image");
break;
}
}
// update progress
progressCnt += progressStep;
UpdateProgress(progress, progressCnt);
}
}
await TrainingWhitelistAsync();
Debug.WriteLine("Whitelist created successfully!");
}