The part of the screen that was overlaid is saved and restored when the screen overlay is removed. THIS DEFINITION IS FOR PERSONAL USE ONLY. All other reproduction requires permission.
The Camera Control button extends that area to an overlay where the Camera Control ... to remove the default Camera icon from the lock screen and replace it with something else.
This also facilitates the connection to the 176×220 color LCD screen. In the video ... is used to grab the image from the camera, draw a circle on it, and overlay the distance in centimeters ...