public static async Task DeleteFaceFromFaceList(string faceIdToDelete)
{
if (faceLists == null)
{
await Initialize();
}
var faceListId = faceLists.FirstOrDefault().Key;
await FaceServiceHelper.DeleteFaceFromFaceListAsync(faceListId, new Guid(faceIdToDelete));
}
/// <summary>
///
/// </summary>
/// <param name="imageStream"></param>
/// <param name="faceId"></param>
/// <param name="faceRectangle"></param>
/// <param name="complexScenario"> - Whether we are identifying face hard way - means whether we need to use db or not</param>
/// <returns></returns>
public static async Task <Tuple <SimilarPersistedFace, string> > FindSimilarPersistedFaceAsync(Stream imageStream, Guid faceId, FaceRectangle faceRectangle)
{
if (faceLists == null)
{
await Initialize();
}
Tuple <SimilarPersistedFace, string> bestMatch = null;
var faceListId = faceLists.FirstOrDefault().Key;
//Delete for testing purposes
//await FaceServiceHelper.DeleteFaceListAsync(faceListId);
try
{
SimilarPersistedFace similarFace = null;
if (faceListId != null)
{
try
{
similarFace = (await FaceServiceHelper.FindSimilarAsync(faceId, faceListId))?.FirstOrDefault();
}
catch (Exception e)
{
if ((e as FaceAPIException).ErrorCode == "FaceListNotReady")
{
// do nothing, list is empty but we continue
}
}
}
if (similarFace != null)
{
if (bestMatch != null)
{
// We already found a match for this face in another list. Replace the previous one if the new confidence is higher.
if (bestMatch.Item1.Confidence < similarFace.Confidence)
{
bestMatch = new Tuple <SimilarPersistedFace, string>(similarFace, faceListId);
}
}
else
{
bestMatch = new Tuple <SimilarPersistedFace, string>(similarFace, faceListId);
}
}
else
{
// If we are here we didnt' find a match, so let's add the face to the first FaceList that we can add it to. We
// might create a new list if none exist, and if all lists are full we will delete the oldest face list (based on when we
// last matched anything on it) so that we can add the new one.
if (!faceLists.Any())
{
// We don't have any FaceLists yet. Create one
newFaceListId = Guid.NewGuid().ToString();
// await FaceServiceHelper.CreateFaceListAsync(newFaceListId, "ManagedFaceList", FaceListsUserDataFilter);
//We are not using filters
await FaceServiceHelper.CreateFaceListAsync(newFaceListId, "ManagedFaceList");
faceLists.Add(newFaceListId, new FaceListInfo {
FaceListId = newFaceListId, LastMatchTimestamp = DateTime.Now
});
}
AddPersistedFaceResult addResult = null;
var faceList = faceLists.First();
if (faceList.Value.IsFull)
{
//It is here only for complex scenario where we use groups and lists mappings
try
{
DBSimilarFace faceToDelete = null;
using (var db = new KioskDBContext())
{
faceToDelete = db.SimilarFaces.OrderByDescending(sf => sf.PersonId).First();
db.SimilarFaces.Remove(faceToDelete);
await db.SaveChangesAsync();
}
await FaceServiceHelper.DeleteFaceFromFaceListAsync(faceList.Key, new Guid(faceToDelete.FaceId));
}
catch (Exception e)
{
Debug.WriteLine("No face to be deleted" + e.Message);
}
}
addResult = await FaceServiceHelper.AddFaceToFaceListAsync(faceList.Key, imageStream, faceRectangle);
if (addResult != null)
{
bestMatch = new Tuple <SimilarPersistedFace, string>(new SimilarPersistedFace {
Confidence = 1, PersistedFaceId = addResult.PersistedFaceId
}, null);
}
}
}
catch (Exception e)
{
// Catch errors with individual face lists so we can continue looping through all lists. Maybe an answer will come from
// another one.
ErrorTrackingHelper.TrackException(e, "Face API FindSimilarAsync error");
}
return(bestMatch);
}
public static async Task <SimilarPersistedFace> FindSimilarPersistedFaceAsync(Stream imageStream, Guid faceId, FaceRectangle faceRectangle, string faceIdToDelete = "")
{
if (faceLists == null)
{
await Initialize();
}
Tuple <SimilarPersistedFace, string> bestMatch = null;
var faceListId = faceLists.FirstOrDefault().Key;
try
{
SimilarPersistedFace similarFace = (await FaceServiceHelper.FindSimilarAsync(faceId, faceListId))?.FirstOrDefault();
if (similarFace != null)
{
if (bestMatch != null)
{
// We already found a match for this face in another list. Replace the previous one if the new confidence is higher.
if (bestMatch.Item1.Confidence < similarFace.Confidence)
{
bestMatch = new Tuple <SimilarPersistedFace, string>(similarFace, faceListId);
}
}
else
{
bestMatch = new Tuple <SimilarPersistedFace, string>(similarFace, faceListId);
}
}
else
{
// If we are here we didnt' find a match, so let's add the face to the first FaceList that we can add it to. We
// might create a new list if none exist, and if all lists are full we will delete the oldest face list (based on when we
// last matched anything on it) so that we can add the new one.
if (!faceLists.Any())
{
// We don't have any FaceLists yet. Create one
string newFaceListId = Guid.NewGuid().ToString();
// await FaceServiceHelper.CreateFaceListAsync(newFaceListId, "ManagedFaceList", FaceListsUserDataFilter);
//We are not using filters
await FaceServiceHelper.CreateFaceListAsync(newFaceListId, "ManagedFaceList");
faceLists.Add(newFaceListId, new FaceListInfo {
FaceListId = newFaceListId, LastMatchTimestamp = DateTime.Now
});
}
AddPersistedFaceResult addResult = null;
var faceList = faceLists.First();
if (faceList.Value.IsFull)
{
await FaceServiceHelper.DeleteFaceFromFaceListAsync(faceList.Key, new Guid(faceIdToDelete));
addResult = await FaceServiceHelper.AddFaceToFaceListAsync(faceList.Key, imageStream, faceRectangle);
}
if (addResult != null)
{
bestMatch = new Tuple <SimilarPersistedFace, string>(new SimilarPersistedFace {
Confidence = 1, PersistedFaceId = addResult.PersistedFaceId
}, null);
}
}
}
catch (Exception e)
{
// Catch errors with individual face lists so we can continue looping through all lists. Maybe an answer will come from
// another one.
ErrorTrackingHelper.TrackException(e, "Face API FindSimilarAsync error");
}
return(bestMatch?.Item1);
}
