Perception of local orientation from shaded images

Pollick, F. E. , Watanabe, H. and Kawato, M. (1996) Perception of local orientation from shaded images. Perception and Psychophysics, 58(5), pp. 762-780. (doi: 10.3758/BF03213108) (PMID:8710454)

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The perception of local orientation from shaded images was examined. In Experiment 1, subjects viewed a boundaryless Gaussian hill and judged local orientation using both a gauge figure and a pointing method. One subject reported an internally consistent surface which was incompatible with the judged light-source direction and model used to generate the image. The remaining subjects reported a surface similar to the generating one, and analysis of their results indicated a contour of zero difference between response and generating slants. This contour of zero slant difference was explored in three subsequent experiments using the pointing technique. These experiments investigated possible influences of luminance artifact (Experiment 2), perception of global orientation (Experiment 3), and self-occluding contours (Experiment 4). All three of these experiments yielded results similar to those of Experiment 1, with distinct contours of zero slant difference. This contour was explored for relationships with the simulated slant of the generating surface and the differential structure of image intensity. This analysis indicated that the contour of zero slant difference was approximately a line of constant slant which shared large regions of adjacency to the zero crossings of the second directional derivative of image intensity.

Item Type:Articles
Glasgow Author(s) Enlighten ID:Pollick, Professor Frank
Authors: Pollick, F. E., Watanabe, H., and Kawato, M.
College/School:College of Science and Engineering > School of Psychology
Journal Name:Perception and Psychophysics
ISSN (Online):1532-5962

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