Holobot: Hologram based Extended Reality Telepresence Robot

Nowadays, telepresence systems based on the Extended Reality (XR) system are actively developed and used for remote collaboration due to COVID-19. Still, several issues, such as limited traversable space in Virtual Reality (VR) and require all participants to wear head-mounted display (HMD), stop these systems from being used in our daily life. On the other hand, telepresence robots have been used in various fields before the pandemic. However, these robots also have a limitation in that the current form is incapable of delivering non-verbal expressions, which is essential for social interaction. Therefore, we present a Holobot, a telepresence robot based on the XR system. A remote user connects to the Holobot through VR HMDs, and the Holobot augments a virtual avatar that projects users' facial and gesture expressions. We developed a prototype and conducted a simple field test in the exhibition to receive feedback. VR participants enjoyed exploring remote spaces and interacting with each other through Holobot. Furthermore, remote space participants mentioned that a 1:1 scale avatar helped to build co-presence with the VR user. Based on these insights, we think Holobot could provide design guideline for future telepresence robot. For further approach, we plan to improve our prototype and conduct user test for structured evaluation of our system.