人类视觉中的边缘检测器。

Edge detectors in human vision.

作者信息

Shapley R M, Tolhurst D J

出版信息

J Physiol. 1973 Feb;229(1):165-83. doi: 10.1113/jphysiol.1973.sp010133.

DOI:10.1113/jphysiol.1973.sp010133

原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC1350218/

Abstract

The spatial properties of edge detectors were measured psychophysically with the technique of subthreshold addition. Subthreshold patterns used to add to an edge were lines, sine gratings, Gaussian edges, and ramps.2. The sensitivity profile, determined from experiments on subthreshold addition of lines to an edge was an antisymmetric function, with peak sensitivity approximately +/- 1.5' from its midpoint. Its total extent was about +/- 6'.3. The spatial frequency response of edge detectors was measured in experiments on subthreshold addition of sine gratings to an edge. The spatial frequency response was peaked at about 3 c/deg, and was broadly tuned in frequency. It was approximately equal to the Fourier transform of the sensitivity profile, implying linearity of edge detectors.4. The visibility of Gaussian edges and ramps could be explained largely in terms of the activation of edge detector neurones.5. The role of edge detectors in perception, in creating apparent brightness, and as an explanation of contour illusions, is discussed.

摘要

利用阈下相加技术对边缘检测器的空间特性进行了心理物理学测量。用于加到边缘上的阈下图案有线条、正弦光栅、高斯边缘和斜坡。
通过对线条阈下相加到边缘的实验确定的灵敏度分布是一个反对称函数，其峰值灵敏度在距中点约±1.5'处。其总范围约为±6'。
在将正弦光栅阈下相加到边缘的实验中测量了边缘检测器的空间频率响应。空间频率响应在约3周/度处达到峰值，并且在频率上具有较宽的调谐。它大致等于灵敏度分布的傅里叶变换，这意味着边缘检测器具有线性。
高斯边缘和斜坡的可见性在很大程度上可以根据边缘检测器神经元的激活来解释。
讨论了边缘检测器在感知、产生表观亮度以及作为轮廓错觉解释方面的作用。