Velocity-Based LOD Reduction in Virtual Reality: A Psychometric Approach

David Petrescu, Zahra Montazeri, Steve Pettifer, Paul A. Warren

Research output: Working paper

Abstract

Virtual Reality headsets enable users to explore the environment by performing self-induced movements. The retinal velocity
produced by such motion reduces the visual system’s ability to resolve fine detail. We measured the impact of self-induced head
rotations on the ability to detect quality changes of a realistic 3D model in an immersive virtual reality environment. We varied
the Level-of-Detail (LOD) as a function of rotational head velocity with different degrees of severity. Using a psychophysical
method, we asked 17 participants to identify which of the two presented intervals contained the higher quality model under two
different maximum velocity conditions. After fitting psychometric functions to data relating the percentage of correct responses
to the aggressiveness of LOD manipulations, we identified the threshold severity for which participants could reliably (75%)
detect the lower LOD model. Participants accepted an approximately four-fold LOD reduction even in the low maximum velocity
condition without a significant impact on perceived quality, which suggests that there is considerable potential for optimisation
when users are moving (increased range of perceptual uncertainty). Moreover, LOD could be degraded significantly more in
the maximum head velocity condition, suggesting these effects are indeed speed dependent
Original languageEnglish
Publication statusPublished - Sept 2022

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