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  Spatiotemporal discrimination thresholds for dynamic random fractal (1/f) textures

Cunningham, D., Billock, V., & Tsou, B. (2000). Spatiotemporal discrimination thresholds for dynamic random fractal (1/f) textures. Poster presented at 23rd European Conference on Visual Perception (ECVP 2000), Groningen, The Netherlands.

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Cunningham, DW1, 2, Author              
Billock, VA, Author
Tsou, BH, Author
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1Department Human Perception, Cognition and Action, Max Planck Institute for Biological Cybernetics, Max Planck Society, ou_1497797              
2Max Planck Institute for Biological Cybernetics, Max Planck Society, Spemannstrasse 38, 72076 Tübingen, DE, ou_1497794              

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 Abstract: Natural scenes are fractal in space (ie they have 1/f B spatial frequency spectra) and time (1/f A temporal spectra), and can be compellingly mimicked by fractal textures. If dynamic fractal texture statistics are used to describe natural scenes, then data on discriminability of such textures are required. The smallest detectable change was measured separately for 10 spatial (0.4 to 2.2) and 8 temporal exponents (static, and 0.2 to 1.4) with an adaptive staircase. Computational constraints limited each fractal to 64 frames (~ 2 s) of 64 × 64 pixel images. Spatial discriminations were easiest when the spatial exponent B was ~ 1.6 and were similar across all temporal exponents. Temporal discriminations were easiest when the temporal exponent A was ~ 0.8, and increased in difficulty as the spatial exponent increased. This similarity in spatial discrimination thresholds for static and dynamic fractals suggests that the spatial and temporal dimensions are independent in dynamic fractals (at least for spatial judgments), as is often assumed. The dependence of temporal judgments on the coarseness of the texture (ie on the spatial exponent) is understandable, as a 1 mm change in position is more noticeable for a 1 mm object than for a 100 m object.

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 Dates: 2000-08
 Publication Status: Published in print
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 Identifiers: BibTex Citekey: 1995
DOI: 10.1177/03010066000290S101
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Title: 23rd European Conference on Visual Perception (ECVP 2000)
Place of Event: Groningen, The Netherlands
Start-/End Date: 2000-08-27 - 2000-08-31

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Title: Perception
Source Genre: Journal
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Publ. Info: London : Pion Ltd.
Pages: - Volume / Issue: 29 (ECVP Abstract Supplement) Sequence Number: - Start / End Page: 104 Identifier: ISSN: 0301-0066
CoNE: https://pure.mpg.de/cone/journals/resource/954925509369