6533b861fe1ef96bd12c568c

RESEARCH PRODUCT

Assessment of spatial perception for a multi-layer volumetric display: the effect of exocentric and egocentric distance on relative depth judgements

subject

description

Three-dimensional images on multiple depth layers of the volumetric display provide the physiological depth cues which ensure the high precision of depth judgements at close viewing distances and enhance the user experience. However, the contribution of physiological cues declines with an increase of viewing distance (egocentric distance), and the human spatial perception varies depending on the inter-stimuli distance (exocentric distance). We conducted a psychophysical experiment to test the perception of three-dimensional images rendered on the volumetric display depending on exocentric and egocentric stimuli distance. The constant angular size visual stimuli were displayed on different depth layers of the optical element at three eccentricities in a random order. In 4AFC tasks, observers were required to indicate the closest stimulus. The decline in performance was evident at the largest tested exocentric distance, and it became more pronounced with an increase of egocentric distance. However, no performance differences manifested themselves when stimuli were located close to each other. Namely, the correct relative depth judgements were given quickly regardless of slight changes in the egocentric distance. We discuss how the viewing distance and spatial layout of stimuli facilitate perception of three-dimensional images on the volumetric display.