Contour A set of points that outlines a facial landmark or region such as eye, face, or lips. 
Face A human face detected in an image or video. 
FaceDetector Detector for finding Faces in a supplied image. 
FaceDetector.Builder Builder for creating face detector instances. 
Landmark A point on a detected face, such as an eye, nose, or mouth. 
LargestFaceFocusingProcessor Face processor that focuses on tracking a single "prominent face", in conjunction with the associated FaceDetector
LargestFaceFocusingProcessor.Builder Builder for creating a LargestFaceFocusingProcessor.