Marker-based AR implies the scanning of a particular image (marker) with the
camera of your mobile device. The device recognizes the marker and displays
the augmented reality content on top of it. For instance, this type of AR is
purposefully used when we want to bring artworks to life from the same point
as captured on the image, creating a smooth effect of revival.
In order for a mobile device to accurately recognize the marker, the latter needs
to have distinctive features and good enough contrast. Any image or object can
serve as a marker, provided that it has sufficient unique visual points.
The common examples include printed materials, such as logos, pictures,
leaflets, brochures, posters and even cylindrical objects like bottles and cans,
which require marker-based cylindrical AR tracking.
With the help of extended tracking, the user can then move the marker around
to a certain degree and the AR content will follow it, maintaining its orientation
within a scene. In the Arloopa app, the user can also detach the AR content
from the marker and place it anywhere in their environment, manually move it
around and zoom in/out as needed.