Spatial-frequency tuning of visual contour integration
Spatial-frequency tuning of visual contour integration
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DOI：
10.1364/josaa.15.001486
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发表时间：
1998-06-01
影响因子：
1.9
通讯作者：
Hess, RF
中科院分区：
文献类型：
--
作者：
Dakin, SC;Hess, RF
我们研究的机制，有助于视觉轮廓检测，特别是其调整轮廓组件的空间频率。测量的检测的轮廓组成的Gabor微图案内持有的随机取向的干扰素元素。干扰物被随机分配到两个空间频率中的一个，并且沿着轮廓的元素在这些值之间交替。我们报告说，连续的轮廓元素之间的容忍的空间频率差的程度是成反比的方向之间的差异。对于直线轮廓的空间频率调谐（半高处的半宽）类似于1.3倍频程，但是对于连续元素之间具有30度差的轮廓，下降到类似于0.7倍频程。曲线轮廓的积分在较窄的带宽下操作。自然图像中的许多方向信息来自边缘，我们认为这种调整的缩小与伴随边缘曲率增加的尺度间支持的减少有关。(C)1998年美国光学学会。
We examine the mechanism that subserves visual contour detection and particularly its tuning for the spatial frequency of contour components. The measured the detection of contours composed of Gabor micropatterns within a held of randomly oriented distracter elements. Distracters were randomly assigned one of two spatial frequencies, and elements lying along the contour alternated between these values. We report that the degree of tolerable spatial-frequency difference between successive contour elements is inversely proportional to the orientation difference between them. Spatial-frequency tuning (half-width at half-height) for straight contours is similar to 1.3 octaves but, for contours with a 30 degrees difference between successive elements, drops to similar to 0.7 octaves. Integration of curved contours operates at a narrower bandwidth. Much orientation information in natural images arises from edges, and we propose that this narrowing of tuning is related to the reduction in interscale support that accompanies increasing edge curvature. (C) 1998 Optical Society of America.