Locating the singular point in first-order optical flow fields
Locating the singular point in first-order optical flow fields
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DOI：
10.1037/0096-1523.24.5.1415
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发表时间：
1998-10
期刊：
影响因子：
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通讯作者：
S. F. Pas;A. Kappers;J. Koenderink
中科院分区：
文献类型：
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作者：
S. F. Pas;A. Kappers;J. Koenderink
作者调查了参与者在膨胀或旋转流场中定位奇点的能力。参与者的回答让我们深入了解可能偏离真实点的程度和方向，以及参与者回答的可重复性。刺激窗口为半径为10°的圆形。参与者的表现随着刺激的扩大或旋转而改善。当外部边缘或中央部分的刺激被封锁，性能不受影响时，奇点内的可见部分的刺激。然而，在刺激的可见部分之外的奇点被判断为比实际更接近可见部分的边缘。随着整个刺激区域的偏心率增加（高达20°，保持场大小恒定），性能恶化，而它不受刺激内奇点偏心率的影响。对报告期的严格限制只对业绩产生了数量上的影响。
The authors investigated how well participants were able to locate the singular point in an expanding or rotating flow field. The participants' responses gave insight into the magnitude and direction of possible deviations from the veridical point and into the reproducibility of the participants' answers. The stimulus window was circular with a radius of 10°. The performance of the participants improved with increasing expansion or rotation of the stimulus. When either the outer rim or the central part of the stimulus was blocked out, performance was not affected when singular points were inside the visible part of the stimulus. Singular points that were outside the visible part of the stimulus, however, were judged to be closer to the rim of the visible part than they actually were. Performance deteriorated with increasing eccentricity of the entire stimulus area (up to 20°, keeping the field size constant), whereas it was not affected by the eccentricity of the singular point within the stimulus. A drastic limitation of the presentation period had only a quantitative effect on performance.