Analysis Of Human Perception Of Surface Directionality
Creators: name: Shah, Pratik
name: Chantler, Mike
name: Green, Patrick
Publisher: name: Zenodo
Year: 2012
Subjects: Perceived directionality
Surface texture
Human perception

description: Among many visual characteristics of surfaces, directionality is known to be very important [1, 2, 13, 14] in human perception of textured surfaces. Through series of psychophysical experiments, we investigated effects of various factors on human perception of directionality of synthetic random-phase textured surfaces (see Figure 1) defined by mathematical model. The parameters of the surface model were varied to generate height maps of different directional surfaces, which were then rendered and animated in real-time with controlled illumination. Observers were asked to provide their responses about the directionality of these surfaces during psychophysical experiments. The responses were used to derive a perceptual scale of directionality (perceived directionality) that could be related to parameters of surface model. Statistical tests were carried out to determine if the differences in perceived directionality due to change in the values of parameters are significant.
The parameters, whose effects were investigated, are: angular variance (σ2), RMS roughness (δ), central radial frequency (fc) and Bandwidth (Bw). It was found that all four parameters have significant effect on human perception of directionality when their separate effects were investigated and only first three parameters have significant effect when their combined effects were investigated. In the first case, each parameter is varied while holding the other constant and in the second case, all are varied together in one experiment. This record was migrated from the OpenDepot repository service in June, 2017 before shutting down.
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