Relationship between perceived room brightness and light source appearance mode in different media: reality, virtual reality and 2D images

The appearance mode of an object, whether it appears self-luminous or reflective, depends on its luminance and its surrounding. This research aims to verify whether the appearance mode of a spherical lamp (“on” / “off”) and perceived room brightness is influenced by the presentation medium: real 3D scenes (R-3D), rendered virtual 3D scenes (VR-3D) presented on a head-mounted-display (HMD) and 2D scenes presented on a regular display (D-2D). Twenty observers evaluated the lamp’s appearance mode when presented in different luminance values and rated the apparent room brightness of the scene under four viewing conditions: R-3D and D-2D with warm-white scene lighting, and D-2D and VR-3D with cool-white scene lighting. Threshold luminance, defined as the luminance corresponding to a 50-50 chance of perceiving a lamp as switched on, showed large observer variability, which might originate from the diversity of the observers’ understanding of the lamp material and their strategy to judge the appearance mode. Respectively, threshold luminance and room brightness were significantly lower and significantly higher for the virtual reality scene than for the other conditions. However, no evidence was found that the appearance mode of a spherical lamp can relevantly predict room brightness.

ISBN:978-0-89208-348-0

Jaar van publicatie:2020

Toegankelijkheid:Open