Real-and-Present: Investigating the Use of Life-Size 2D Video Avatars in HMD-Based AR Teleconferencing
CoRR(2024)
摘要
Augmented Reality (AR) teleconferencing allows separately located users to
interact with each other in 3D through agents in their own physical
environments. Existing methods leveraging volumetric capturing and
reconstruction can provide a high-fidelity experience but are often too complex
and expensive for everyday usage. Other solutions target mobile and
effortless-to-setup teleconferencing on AR Head Mounted Displays (HMD). They
directly transplant the conventional video conferencing onto an AR-HMD platform
or use avatars to represent remote participants. However, they can only support
either a high fidelity or a high level of co-presence. Moreover, the limited
Field of View (FoV) of HMDs could further influence users' immersive
experience. To achieve a balance between fidelity and co-presence, we explore
using life-size 2D video-based avatars (video avatars for short) in AR
teleconferencing. Specifically, with the potential effect of FoV on users'
perception of proximity, we first conduct a pilot study to explore the
local-user-centered optimal placement of video avatars in small-group AR
conversations. With the placement results, we then implement a proof-of-concept
prototype of video-avatar-based teleconferencing. We conduct user evaluations
with the prototype to verify its effectiveness in balancing fidelity and
co-presence. Following the indication in the pilot study, we further
quantitatively explore the effect of FoV size on the video avatar's optimal
placement through a user study involving more FoV conditions in a VR-simulated
environment. We regress placement models to serve as references for
computationally determining video avatar placements in such teleconferencing
applications on various existing AR HMDs and future ones with bigger FoVs.
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