What defines a view?
详细信息 查看全文
- 作者：Tarr ; Michael J. ; Kriegman ; David J.
- 关键词：Object representation ; Viewpoint effects ; Shape perception ; Characteristic views ; Aspect graphs
- 刊名：Vision Research
- 出版年：2001
- 出版时间：July, 2001
- 年：2001
- 卷：41
- 期：15
- 页码：1981-2004
- 全文大小：543 K
文摘
At a given instant we see only visible surfaces, not an object's complete 3D appearance. Thus, objects may be represented as discrete ‘views’ showing only those features visible from a limited range of viewpoints. We address how to define a view using Koenderink's (Koenderink & Van Doorn, Biol. Cybernet. 32 (1979) 211.) geometric method for enumerating complete sets of stable views as aspect graphs. Using objects with known aspect graphs, five experiments examined whether the perception of orientation is sensitive to the qualitative features that define aspect graphs. Highest sensitivity to viewpoint changes was observed at locations where the theory predicts qualitative transitions, although some transitions did not affect performance. Hypotheses about why humans ignore some transitions offer insights into mechanisms for object representation.