def add_face(self, image_path):
faces = Faces()
faces.from_file(image_path)
image = Image.open(image_path)
if not faces.data:
raise MissingFaceException("image has no faces")
face = self.find_key_face(faces, image)
if not face:
raise NoRectangleException("can't find valid rectangle for faces in image " + image_path)
self.faces.append({"face": face, "image": image})
