/// <summary>
/// Add All detected faces to a specific collection
/// </summary>
/// <param name="collectionId"></param>
/// <param name="imageId"></param>
/// <param name="image"></param>
public FaceRecord AddImageToCollection(string collectionId, Amazon.Rekognition.Model.Image image)
{
AmazonRekognitionClient rekognitionClient = AmazonClient.GetInstance();
//Validate that image contains only one face.
DetectFacesResponse detectFacesResponse = rekognitionClient.DetectFaces(new Amazon.Rekognition.Model.DetectFacesRequest
{
Attributes = new List <string> {
"ALL"
},
Image = image
});
if (null != detectFacesResponse.FaceDetails && detectFacesResponse.FaceDetails.Count > 1)
{
throw new ArgumentNullException("Many faces in the image");
}
IndexFacesRequest indexFacesRequest = new IndexFacesRequest()
{
Image = image,
CollectionId = collectionId,
DetectionAttributes = new List <String>()
{
"ALL"
}
};
IndexFacesResponse indexFacesResponse = rekognitionClient.IndexFaces(indexFacesRequest);
return(indexFacesResponse.FaceRecords.FirstOrDefault());
}
public List <string> GetAllFacesInCollection(string collectionId)
{
AmazonRekognitionClient rekognitionClient = AmazonClient.GetInstance();
ListFacesResponse listFacesResponse = null;
List <string> faces = new List <string>();
string paginationToken = null;
do
{
if (listFacesResponse != null)
{
paginationToken = listFacesResponse.NextToken;
}
ListFacesRequest listFacesRequest = new ListFacesRequest()
{
CollectionId = collectionId,
MaxResults = 1,
NextToken = paginationToken
};
listFacesResponse = rekognitionClient.ListFaces(listFacesRequest);
foreach (Amazon.Rekognition.Model.Face face in listFacesResponse.Faces)
{
faces.Add(face.FaceId);
}
}while (listFacesResponse != null && !String.IsNullOrEmpty(listFacesResponse.NextToken));
return(faces);
}
public void RemoveFacesFromCollection(string collectionId, List <string> removedFaces)
{
AmazonRekognitionClient rekognitionClient = AmazonClient.GetInstance();
DeleteFacesRequest deleteFacesRequest = new DeleteFacesRequest()
{
CollectionId = collectionId,
FaceIds = removedFaces
};
DeleteFacesResponse deleteFacesResponse = rekognitionClient.DeleteFaces(deleteFacesRequest);
}
public List <FaceRecord> Recognize(string collectionId, Amazon.Rekognition.Model.Image image)
{
//1- Detect faces in the input image and adds them to the specified collection.
AmazonRekognitionClient rekognitionClient = AmazonClient.GetInstance();
IndexFacesRequest indexFacesRequest = new IndexFacesRequest()
{
Image = image,
CollectionId = collectionId,
DetectionAttributes = new List <String>()
{
"DEFAULT"
}
};
IndexFacesResponse indexFacesResponse = rekognitionClient.IndexFaces(indexFacesRequest);
//2- Search all detected faces in the collection
SearchFacesResponse searchFacesResponse = null;
List <FaceRecord> matchedFaces = new List <FaceRecord>();
if (null != indexFacesResponse && null != indexFacesResponse.FaceRecords && 0 != indexFacesResponse.FaceRecords.Count)
{
foreach (FaceRecord face in indexFacesResponse.FaceRecords)
{
searchFacesResponse = rekognitionClient.SearchFaces(new SearchFacesRequest
{
CollectionId = collectionId,
FaceId = face.Face.FaceId,
FaceMatchThreshold = 70F,
MaxFaces = 2
});
if (searchFacesResponse.FaceMatches != null && searchFacesResponse.FaceMatches.Count != 0)
{
matchedFaces.Add(face);
}
}
//Remove newly added faces to the collection
_collectionService.RemoveFacesFromCollection(collectionId, indexFacesResponse.FaceRecords.Select(x => x.Face.FaceId).ToList());
}
return(matchedFaces);
}
public bool AddCollection(string collectionId)
{
try
{
AmazonRekognitionClient rekognitionClient = AmazonClient.GetInstance();
CreateCollectionRequest createCollectionRequest = new CreateCollectionRequest()
{
CollectionId = collectionId
};
CreateCollectionResponse createCollectionResponse = rekognitionClient.CreateCollection(createCollectionRequest);
return(true);
}
catch (Exception ex)
{
return(false);
}
}
