Snippe H P, Koenderink J J
Utrecht Biophysics Research Institute, Buys Ballot Laboratory, The Netherlands.
J Opt Soc Am A Opt Image Sci Vis. 1994 Apr;11(4):1222-36. doi: 10.1364/josaa.11.001222.
We study the possibility of a metrical readout of velocity from an ensemble of Reichardt correlators. We show that with a suitable choice of spatial and temporal prefiltering of the correlator input it is possible to devise reliable (nonaliasing) velocity-tuned Reichardt detectors. However, because of the well-known covariance of spatial and velocity tuning of velocity detectors in biological motion vision, an ensemble consisting of these detectors has problems in extracting a pattern-invariant velocity. We find that pattern invariance of the motion estimate can be closely approximated with Reichardt correlators that sample the luminance pattern at more than the minimum number of two locations.
我们研究了从一组赖卡特相关器中进行速度的度量读出的可能性。我们表明，通过对相关器输入进行适当的空间和时间预滤波，可以设计出可靠的（无混叠）速度调谐赖卡特探测器。然而，由于生物运动视觉中速度探测器的空间和速度调谐存在众所周知的协方差，由这些探测器组成的集合在提取模式不变速度方面存在问题。我们发现，运动估计的模式不变性可以通过在多于两个位置对亮度模式进行采样的赖卡特相关器来紧密逼近。
