Judged shape of ground plane regions in realistic 3-D scenes

Sauer, Craig; Braunstein, Myron L.; Andersen, George J.; Bian, Zheng

doi:10.1167/1.3.41

Journal of Vision

2010

DOI: 10.1167/1.3.41

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Judged shape of ground plane regions in realistic 3-D scenes

Craig Sauer

Myron L. Braunstein

George J. Andersen

et al.

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“…In the L-shaped condition ( Figure 1A), an observer was asked to perceptually match the sagittal length (L) of the L-shaped target to its lateral width (W). It was expected that the observer would require the length of the L-shaped target to be longer to match its width; that is, the aspect ratio (W/L) of the matched L-shaped target would be smaller than 1 (Loomis & Philbeck, 1999;Loomis, Philbeck, & Zahorik, 2002;Sauer, Braunstein, Andersen, & Bian, 2001). In addition, our previous studies have shown that the foreshortening of the L-shaped target is affected by the extent of the visible ground surface supporting the target .…”

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confidence: 99%

Perceived relative distance on the ground affected by the selection of depth information

Ooi

2008

Perception & Psychophysics

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confidence: 99%

Perceived relative distance on the ground affected by the selection of depth information

Ooi

2008

Perception & Psychophysics

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Judging Distance across Texture Discontinuities

2003

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Sinai et al (1998 Nature 395 497-500) showed that less distance is perceived along a ground surface that spans two differently textured regions than along a surface that is uniformly textured. We examined the effect of texture continuity on judged distance using computer-generated displays of simulated surfaces in five experiments. Discontinuities were produced by using different textures, the same texture reversed in contrast, or the same texture shifted horizontally. The simulated surface was either a ground plane or a frontoparallel plane. For all textures and both orientations, less distance was judged in the discontinuous conditions than in continuous conditions. We propose that when a surface contains a texture discontinuity, a small area adjacent to the perceived boundary is excluded from judged distances.

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Perception of Scene Layout from Optical Contact, Shadows, and Motion

Braunstein

Andersen

2004

Perception

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Kersten et al (1997 Perception 26 171-192) found that the perceived motion of an object in a 3-D scene was determined by the motion of a shadow. In the present study, we compared the effect of a shadow to that of a second object on the ground in determining the perceived position in depth of a floating object in both dynamic and stationary scenes. Changing the second (lower) object from textured to dark increased the influence of the second object on the judged position of the first object. Giving the second object zero thickness had this effect only if it was also dark. Variations in the height of the floating object were important with a second object but not with a shadow, in motion scenes. With alternative shadows present, the position of the floating object was determined primarily by matching speeds, with matching sizes as a secondary factor. These results show some similarities but important differences between the effect of a second object and that of a shadow.

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Judged shape of ground plane regions in realistic 3-D scenes

Cited by 5 publications

References 0 publications

Perceived relative distance on the ground affected by the selection of depth information

Perceived relative distance on the ground affected by the selection of depth information

Judging Distance across Texture Discontinuities

Perception of Scene Layout from Optical Contact, Shadows, and Motion

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