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Surface-slant-from-texture discrimination: Effects of slant level and texture type

2002

Poster

ei


The problem of surface-slant-from-texture was studied psychophysically by measuring the performances of five human subjects in a slant-discrimination task with a number of different types of textures: uniform lattices, randomly displaced lattices, polka dots, Voronoi tessellations, orthogonal sinusoidal plaid patterns, fractal or 1/f noise, “coherent” noise and a “diffusion-based” texture (leopard skin-like). The results show: (1) Improving performance with larger slants for all textures. (2) A “non-symmetrical” performance around a particular slant characterized by a psychometric function that is steeper in the direction of the more slanted orientation. (3) For sufficiently large slants (66 deg) there are no major differences in performance between any of the different textures. (4) For slants at 26, 37 and 53 degrees, however, there are marked differences between the different textures. (5) The observed differences in performance across textures for slants up to 53 degrees are systematic within subjects, and nearly so across them. This allows a rank-order of textures to be formed according to their “helpfulness” — that is, how easy the discrimination task is when a particular texture is mapped on the surface. Polka dots tended to allow the best slant discrimination performance, noise patterns the worst up to the large slant of 66 degrees at which performance was almost independent of the particular texture chosen. Finally, our large number of 2AFC trials (approximately 2800 trials per texture across subjects) and associated tight confidence intervals may enable us to find out about which statistical properties of the textures could be responsible for surface-slant-from-texture estimation, with the ultimate goal of being able to predict observer performance for any arbitrary texture.

Author(s): Rosas, P. and Wichmann, FA. and Wagemans, J.
Journal: Journal of Vision
Volume: 2
Number (issue): 7
Pages: 300
Year: 2002
Month: November
Day: 0

Department(s): Empirical Inference
Bibtex Type: Poster (poster)

Digital: 0
DOI: 10.1167/2.7.300
Event Name: Second Annual Meeting of the Vision Sciences Society (VSS 2002)
Event Place: Sarasota, FL, USA
Organization: Max-Planck-Gesellschaft
School: Biologische Kybernetik

Links: Web

BibTex

@poster{1157,
  title = {Surface-slant-from-texture discrimination: Effects of slant level and texture type},
  author = {Rosas, P. and Wichmann, FA. and Wagemans, J.},
  journal = {Journal of Vision},
  volume = {2},
  number = {7},
  pages = {300},
  organization = {Max-Planck-Gesellschaft},
  school = {Biologische Kybernetik},
  month = nov,
  year = {2002},
  month_numeric = {11}
}