Colour, contours, shading and shape: flow interactions reveal anchor neighbourhoods
Colour, contours, shading and shape: flow interactions reveal anchor neighbourhoods
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DOI：
10.1098/rsfs.2018.0019
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发表时间：
2018-08-06
期刊：
影响因子：
4.4
通讯作者：
Zucker, Steven W.
中科院分区：
文献类型：
--
作者：
Kunsberg, Benjamin;Holtmann-Rice, Daniel;Zucker, Steven W.
在从阴影推断形状信息时出现两个难题。首先，根据渲染物理学，图像可以随着照明或视点的（甚至）微小变化而显著变化，而图像通常不会。第二，亮度变化可以由材料效应（例如着色）以及阴影效应引起。如果解释不当，材质效果会混淆着色效果。我们展示了这些困境是如何通过回顾形状推断的最新发展，以及颜色在分离材料的阴影效应中的作用。这两个方面都表示在一个共同的几何（流）框架，色调/形状的相互作用的新显示器展示了一个全球性的影响与相互作用局限于局部区域。并非图像的所有部分在感知上都是相等的;形状感知似乎是从图像锚区域构建的。
Two dilemmas arise in inferring shape information from shading. First, depending on the rendering physics, images can change significantly with (even) small changes in lighting or viewpoint, while the percept frequently does not. Second, brightness variations can be induced by material effects-such as pigmentation-as well as by shading effects. Improperly interpreted, material effects would confound shading effects. We show how these dilemmas are coupled by reviewing recent developments in shape inference together with a role for colour in separating material from shading effects. Aspects of both are represented in a common geometric (flow) framework, and novel displays of hue/shape interaction demonstrate a global effect with interactions limited to localized regions. Not all parts of an image are perceptually equal; shape percepts appear to be constructed from image anchor regions.