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. Author manuscript; available in PMC: 2009 Oct 13.
Published in final edited form as: J Vis. 2006 May 5;6(5):634–648. doi: 10.1167/6.5.8

Figure 15. Two surfaces perceived by one observer (PJN) in this study to be equal in roughness.

Figure 15

A fronto-parallel view of (a) a test surface with roughness r=1.56 cm under one illuminant (ϕ = 70°) and (b) a match surface with roughness r = 0.61 cm under another illuminant (ϕ = 50°), that was perceived to be equal in roughness to the surface in (a).