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Physical environment understanding is vital in delivering immersive andinteractive mobile augmented reality (AR) user experiences. Recently, we havewitnessed a transition in the design of environment understanding systems, fromvisual data focused to centering on the concept of spatial context, includinguser, device, and environment information. Even though spatial context canbenefit the environment understanding tasks, e.g., we demonstrate in a casestudy that lighting estimation performance can be improved by as much as 59%,not all environment understanding systems support spatial context. Furthermore,even for the environment understanding systems that support spatial context,not all useful spatial context has been leveraged; and the design andimplementation can differ vastly. In this paper, we advocate for the design ofa spatial context-aware and shared environment understanding system that caneffectively support multiple tasks simultaneously. Fundamentally, there aremany practical challenges in designing such a unified environment understandingsystem. We discuss the challenges in the context of three open questions, (i)how to fully leverage user mobility, (ii) how to design a unified data model,and (iii) finally how to build a shared system for multiple tasks.

Get-A-Sense: Designing Spatial Context Awareness for Mobile AR Environment Understanding