PERCEPTUAL SENSITIVITY MAPS WITHIN GLOBALLY DEFINED VISUAL SHAPES
PERCEPTUAL SENSITIVITY MAPS WITHIN GLOBALLY DEFINED VISUAL SHAPES
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DOI：
10.1038/370644a0
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发表时间：
1994-08-25
期刊：
影响因子：
64.8
通讯作者：
JULESZ, B
中科院分区：
文献类型：
--
作者：
KOVACS, I;JULESZ, B
自然视觉中全局形状的处理是生物学中一个尚未解决的问题。早期视觉的已知过程是空间受限的（或局部的）操作，很少有人知道它们在将视觉图像组织成功能连贯的（或全局的）对象时的相互作用。在这里，我们介绍了一个人类的心理物理方法，它允许我们测量的感知组织的局部视觉检测器的活动模式的影响，我们映射差分对比敏感度的目标跨越由边界包围的区域。我们发现，即使对于边界和目标之间的大距离，局部对比敏感度在边界内也会增强。此外，最大的灵敏度增强的灵敏度地图的位置确定的全局形状属性。我们的数据支持一类通过中轴变换（1-3）描述形状的模型，这意味着视觉系统提取“骨架”作为对象的中间级表示。骨架表示提供了一个结构简化的形状描述，可用于更高级别的操作和编码到内存中。
AN unsolved problem of biology is the processing of global shape in natural vision. The known processes of early vision are spatially restricted (or local) operations, and little is known about their interactions in organizing the visual image into functionally coherent (or global) objects. Here we introduce a human psychophysical method which allows us to measure the effect of perceptual organization on the activity pattern of local visual detectors, We map differential contrast sensitivity for a target across regions enclosed by a boundary. We show that local contrast sensitivity is enhanced within the boundary even for large distances between the boundary and the target. Furthermore, the locations of maximal sensitivity enhancement in the sensitivity maps are determined by global shape properties. Our data support a class of models which describe shapes by the means of a medial axis transformation(1-3), implying that the visual system extracts 'skeletons' as an intermediate-lever representation of objects. The skeletal representation offers a structurally simplified shape description which can be used for higher-level operations and for coding into memory.