Concurrent to the recent progress in
recognition, interesting advancements have been happening in virtual reality (VR by
Oculus) [8], augmented reality (AR by HoloLens) [9], and smart wearable devices.
[8]Oculus, V.: Oculus rift-virtual reality headset for 3d gaming. URL: http://www. oculusvr.
com (2012)
[9]Gottmer, M.: Merging reality and virtuality with microsoft hololens. (2015)