Anisotropy of texture gradient as depth cue A Higashiyama, T Yamazaki |
|---|
Psychology, Ritsumeikan University, Japan
|
| Since Gibson’s (1950), it has been documented that texture gradient generates a slanted surface. To demonstrate this effect, people have normally used texture gradient in which texture density is low at the bottom, is high at the top, and is gradually changed along the vertical axis of the pattern. Our inquiry was to ask whether the effect of texture gradient is independent of orientation of the pattern and of orientation of observer’s head. For this purpose, we used a texture gradient pattern that was consisted of filled circles or of cobble stones. In either pattern, size of texture elements and the space interval between the neighboring elements were changed in perspective and orientation (normal vs. upside-down) of the pattern was also changed. Each of 18 observers viewed each pattern through a head-mounted display while leaning the head downward, keeping it upright, or leaning it backward. The observer judged apparent slant of the surface generated by texture gradient. We found that 1) apparent slant did not change with the change in head position and 2) apparent slant was steeper for the upside-down pattern than fort the normal pattern. We discuss this finding in terms of the anisotropy of visual space. |
| Up Home |
|---|