From: How direction of illumination affects visually perceived surface roughness
Journal of Vision. 2006;6(5):8. doi:10.1167/6.5.8
Figure Legend:
Results for Condition I compared with Condition II. Estimates of the PSE slopes from Condition I are plotted versus
those from Condition II for each observer. Each data point represents a comparison of all surfaces with varying
roughness under two different illuminant conditions (e.g., ϕ = 70 vs. 50 deg) for a given observer. The dotted line
represents the lines of roughness constancy along which points representing slope values of 1 would lie. The dashed line
represents the identity line along which slope values for Conditions I and II would be equal to one another. Notice that
almost all points lie inside the area inscribed by the lines of roughness constancy, indicating that almost all PSE slopes
were
than 1.7/12/2017
Furthermore, all points
lie roughly for
along
the identity
line.
Date
of less
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