Bayesian combination of ambiguous shape cues
Bayesian combination of ambiguous shape cues
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DOI：
10.1167/4.10.7
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发表时间：
2004-01-01
影响因子：
1.8
通讯作者：
Mamassian, P
中科院分区：
文献类型：
--
作者：
Adams, WJ;Mamassian, P
我们研究了当一个线索不明确时，不同的深度线索是如何结合在一起的。凸面和凹面在较大的观看距离下产生相似的纹理投影。本研究考虑了明确的视差信息及其与模糊纹理信息的结合。具体来说，我们询问视差和纹理是在形状估计的线性组合之前单独处理，还是联合处理，以使视差消除纹理信息的歧义。立体呈现了不同深度的垂直脊。它们的纹理与凸脊和凹脊一致（就最大可能性而言）。视差与凸脊或凹脊相符。在另一个单独的实验中，刺激仅由纹理定义（单目观察）。在单目观察下，观察者一致地报告了纹理线索的凸解释。然而，在立体刺激下，纹理信息从视差中调制形状的方式与简单的线性组合不一致。当视差显示凹面时，单眼观察到的高度凸面纹理图案会使刺激看起来比“平坦”纹理图案更凹面。我们的数据证实，不同的线索可以消除彼此的歧义。两个实验的数据都通过贝叶斯方法很好地模拟了凸性先验。
We investigate how different depth cues are combined when one cue is ambiguous. Convex and concave surfaces produce similar texture projections at large viewing distances. Our study considered unambiguous disparity information and its combination with ambiguous texture information. Specifically, we asked whether disparity and texture were processed separately, before linear combination of shape estimates, or jointly, such that disparity disambiguated the texture information.Vertical ridges of various depths were presented stereoscopically. Their texture was consistent (in terms of maximum likelihood) with both a convex and a concave ridge. Disparity was consistent with either a convex or concave ridge. In a separate experiment the stimuli were defined solely by texture (monocular viewing).Under monocular viewing observers consistently reported the convex interpretation of the texture cue. However, in stereoscopic stimuli, texture information modulated shape from disparity in a way inconsistent with simple linear combination. When disparity indicated a concave surface, a texture pattern perceived as highly convex when viewed monocularly caused the stimulus to appear more concave than a "flat" texture pattern. Our data confirm that different cues can disambiguate each other. Data from both experiments are well modeled by a Bayesian approach incorporating a prior for convexity.