Measurement of Perceptual Roughness in Fractal Surfaces

Proc. CIE Expert Symposium on Visual Appearance, 2006
In this paper we present an investigation into visually perceived surface roughness. First we present psychophysical evidence that suggests that there is a simple relationship between perceived roughness and two well known surface parameters: fractal dimension and rms roughness. And that neither are good estimators, on there own, of perceived roughness. Second we present a measurement model for deriving the perceived roughness of a surface from its height function which is motivated by the spatial frequency channel model of the human visual system.


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