Basically, marker-based AR requires specific labels to
register the position of 3D objects on the real-world image.
As presented in Fig. 2, an AR book with basic equipment
such as a webcam and marker labels is one of the typical
marker-based applications and has been employed in several
studies (e.g., Koong Lin et al. 2011; Martı´n-Gutie´rrez
et al. 2010).