CameraSource.PictureCallback	Callback interface used to supply image data from a photo capture.
CameraSource.ShutterCallback	Callback interface used to signal the moment of actual image capture.
Detector.Processor<T>	Interface for defining a post-processing action to be executed for each detection, when using the detector as part of a pipeline (see the class level docs above).
MultiProcessor.Factory<T>	Factory for creating new tracker instances.

CameraSource	Manages the camera in conjunction with an underlying `Detector`.
CameraSource.Builder	Builder for configuring and creating an associated camera source.
Detector<T>	Detector is the base class for implementing specific detector instances, such as a barcode detector or face detector.
Detector.Detections<T>	Detection result object containing both detected items and the associated frame metadata.
FocusingProcessor<T>	Base class for implementing a `processor` which filters the set of detection results, consistently delivering a single detected item to an associated `Tracker`.
Frame	Image data with associated `metadata`.
Frame.Builder	Builder for creating a frame instance.
Frame.Metadata	Frame metadata, describing the image dimensions, rotation, and sequencing information.
MultiDetector	A multi-detector is used to combine multiple detectors, so that multiple detectors can be used together on a frame or frames received from a source within a pipeline.
MultiDetector.Builder	Builder for creating MultiDetector instances.
MultiProcessor<T>	Detection processor which distributes the items of a detection result among individual trackers.
MultiProcessor.Builder<T>	Builder for creating a multiprocessor instance.
Tracker<T>	A tracker is used to receive notifications for a detected item over time.