AR technology was born after virtual reality technology. Virtual reality replaces reality with a simulation. On the
other hand, in AR technology, a view of a reality can be modified by addition of digital information so that it can
improve a person's perception of the reality. In AR, there are four main components: (1) a camera to capture a target
information, (2) marker which is the target information, (3) mobile phones to store and process information when
the captured image is the target information (marker), and (4) digital content is the content that will be displayed on
the screen when the camera is able to track the marker. Fig. 1 shows an example of an AR application where the
marker is a real memory stick called random access memory (RAM). When the camera phone has tracked the RAM,
the phone will then display digital information associated with the marker on the screen.