Medial-point description of shape:: a representation for action coding and its psychophysical correlates
Medial-point description of shape:: a representation for action coding and its psychophysical correlates
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DOI：
10.1016/s0042-6989(97)00321-0
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发表时间：
1998-08-01
期刊：
影响因子：
1.8
通讯作者：
Julesz, B
中科院分区：
文献类型：
--
作者：
Kovács, I;Fehér, A;Julesz, B
我们描述了一个基于区域的形状表示，可能是特别有用的，从生物学的角度来看，因为它促进了本地化的对象，对象部分相对于彼此。所提出的中点表示类似于中轴类型表示，但它更紧凑。中间点是沿着中间轴的、与边界的最长段等距的沿着的那些点，因此它们表示最大量的边缘信息。主要优点是可以将原始图像减少到少量的点。我们还提供了心理物理相关的形状与日益复杂的表示。使用反向映射技术，我们发现，数字内的对比敏感度的变化是由边界轮廓的形状定义的，在敏感度图中的峰值对应于所提出的表示的中间点。(C)1998爱思唯尔科技有限公司版权所有。
We describe a region-based shape representation that might be particularly useful from a biological perspective because it promotes the localization of objects, and object parts relative to each other. The proposed medial-point representation is similar to medial-axis type representations, but it is more compact. The medial points are those points along the medial axis that are equidistant from the longest segments of the boundary, therefore they represent the largest amount of edge information. The main advantage is that the original image can be reduced to a small number of points. We also provide psychophysical correlates of the representation for shapes with increasing complexity. Using a reverse mapping technique, we find that variations of contrast sensitivity within figures are defined by the shape of the bounding contour, and the peaks in the sensitivity maps correspond to the medial points of the proposed representation. (C) 1998 Elsevier Science Ltd. All rights reserved.