Abstract
Estimating the pose (three-dimensional orientation) of objects is an important aspect of 3-D shape perception. We studied the ability of observers to match the pose of the principal axes of an object with the pose of a cross consisting of three perpendicular axes. For objects, we used a long and a flat spheroid and eight symmetric objects with aspect ratios of dimensions of approximately 4:2:1. Stimulus cues were the contour and stereo for the spheroids, and contour, stereo, and shading for the symmetric objects. In addition, the spheroids were shown with or without surface texture and with or without active motion. Results show that observers can perform the task with standard deviations of a few degrees, though biases could be as large as 30º. The results can be naturally decomposed in viewer-centered coordinates, and it turns out that the estimation of orientation in the frontoparallel plane (tilt) is more precise than estimation of orientation in depth (slant, roll). A comparison of long and flat spheroids shows that sticks lead to better performance than do slabs. This can even be the case within the same object; the pose of the stick-like aspect is seen with more precision than is the pose of the slab-like aspect. The largest biases occurred when the spheroids were displayed with the binocular contour as the only cue. We can explain these biases by assuming that subjects' settings are influenced by the orientation of the rim.
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Ames, A., Jr. (1951). Visual perception and the rotating trapezoidal window.Psychological Monographs,65(7), 1–32.
Annis, R. C., &Frost, B. (1973). Human visual ecology and orientation anisotropies in acuity.Science,182, 729–731.
Appelle, S. (1972). Perception and discrimination as a function of stimulus orientation: The “oblique effect” in man and animals.Psychological Bulletin,78, 266–278.
Braunstein, M. L. (1976).Depth perception through motion. New York: Academic Press.
Coppola, D. M., Purves, H. R., McCoy, A. N., &Purves, D. (1998). The distribution of oriented contours in the real world.Proceedings of the National Academy of Sciences,95, 4002–4006.
Cuijpers, R. H., Kappers, A. M. L., &Koenderink, J. J. (2001). On the role of external reference frames on visual judgements of parallelity.Acta Psychologica,108, 283–302.
Fisher, N. I. (1993).Statistical analysis of circular data. Cambridge: Cambridge University Press.
Gibson, J. J., &Gibson, E. J. (1957). Continuous perspective transformations and the perception of rigid motion.Journal of Experimental Psychology,54, 129–138.
Koenderink, J. J. (1984). What does the occluding contour tell us about solid shape?Perception,13, 321–330.
Koenderink, J. J., van Doorn, A. J., &Kappers, A. M. L. (1992). Surface perception in pictures.Perception & Psychophysics,52, 487–496.
Mardia, K. V., &Jupp, P. E. (2000).Directional statistics. Chichester, U.K.: Wiley.
Marr, D. (1982).Vision. New York: W. H. Freeman.
Marr, D., &Nishihara, H. K. (1978). Representation and recognition of the spatial organization of three-dimensional shapes.Proceedings of the Royal Society of London: Series B,200, 269–294.
Norman, J. F., Dawson, T. E., &Raines, S. R. (2000). The perception and recognition of natural object shape from deforming and static shadows.Perception,29, 135–148.
Norman, J. F., &Todd, J. T. (1994). Perception of rigid motion in depth from the optical deformations of shadows and occlusion boundaries.Journal of Experimental Psychology: Human Perception & Performance,20, 343–356.
Norman, J. F., Todd, J. T., &Phillips, F. (1995). The perception of surface orientation from multiple sources of optical information.Perception & Psychophysics,57, 629–636.
Oomes, A. H. J. (1998).Human visual perception of spatial structure: Symmetry, orientation, and attitude. Unpublished doctoral dissertation, University of Nijmegen.
Pollick, F. E., Nishida, S., Koike, Y., &Kawato, M. (1994). Perceived motion in structure from motion: Pointing responses to the axis of rotation.Perception & Psychophysics,56, 91–109.
Robinson, J. A., McKenzie, B. E., &Day, R. H. (1996). Anticipatory reaching by infants and adults: The effect of object features and apertures in opaque and transparent screens.Child Development,67, 2641–2657.
Rogers, B. J., &Graham, M. (1983). Anisotropies in the perception of three-dimensional surfaces.Science,221, 1409–1411.
Switkes, E., Mayer, M. J., &Sloan, J. A. (1978). Spatial frequency analysis of the visual environment: Anisotropy and the carpentered environment hypothesis.Vision Research,18, 1393–1399.
Wanger, L. R., Ferwerda, J. A., &Greenberg, D. P. (1992). Perceiving spatial relationships in computer-generated images.IEEE Computer Graphics & Applications,12, 44–58.
Westheimer, G., &Beard, B. L. (1998). Orientation dependency for foveal line stimuli: Detection and intensity discrimination, orientation discrimination and Vernier acuity.Vision Research,38, 1097–1103.
Willats, J. (1992). Seeing lumps, sticks, and slabs in silhouettes.Perception,21, 481–496.
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This research was partially funded by the Netherlands Organization for Scientific Research (NWO).
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Oomes, A.H.J., Dijkstra, T.M.H. Object pose: Perceiving 3-D shape as sticks and slabs. Perception & Psychophysics 64, 507–520 (2002). https://doi.org/10.3758/BF03194722
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DOI: https://doi.org/10.3758/BF03194722