By detecting a marker label on a
book through a webcam capture, a virtual element is then
generated by the AR software. This virtual element would
be shown upon the book and recovered on the computer
screen that can be manipulated by tilting or rotating the
book. Moreover, setting with a projector in a traditional
classroom, students can operate the card with an AR
marker to control the 3D objects on a projected screen
(Nu´n˜ez et al. 2008) or a whiteboard (Kerawalla et al.
2006). Also, it is a trend that marker-based AR applications
with mobile devices are being developed, such as the AndAR
project initiated by Google in 2011. With mobile
devices, the applications of AR would not be restricted on
the front of desktop computers.