public bool Train() { var allFaces = faceService_.CallFaces("ALL_USERS"); if (allFaces != null) { var faceImages = new Image <Gray, byte> [allFaces.Count]; var faceLabels = new int[allFaces.Count]; for (int i = 0; i < allFaces.Count; i++) { Stream stream = new MemoryStream(); stream.Write(allFaces[i].Image, 0, allFaces[i].Image.Length); var faceImage = new Image <Gray, byte>(new Bitmap(stream)); faceImages[i] = faceImage.Resize(100, 100, Inter.Cubic); faceLabels[i] = allFaces[i].UserId; } faceRecognizer_.Train(faceImages, faceLabels); faceRecognizer_.Save(recognizerFilePath_); } return(true); }