Detection of spatial discontinuities in first-order optical flow fields
نویسندگان
چکیده
منابع مشابه
Detection of first-order structure in optic flow fields
We measured psychophysical thresholds for the detection of four different optic flow components in the presence of a translational velocity. We also measured thresholds for detection of rotation in the presence of expansion and for expansion in the presence of rotation. Our stimuli consisted of sparse random dot patterns. Detection thresholds are similar for all four optic flow components. Thus...
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Thresholds for the detection of rotation and divergence in the presence of a translational component in sparse random dot patterns are determined for human observers and two computer algorithms. The algorithms only make use of local velocity directions and not of local velocity magnitude (speed). The results show that psychophysical performance in this task can be well described without the nee...
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15 صفحه اولDetection of divergence in optical flow fields
Psychophysical thresholds for the detection of divergence (expansion and contraction) in the presence of a translational component are determined. Stimuli consist of sparse random dot patterns. Lifetime, number of dots, divergence, and translational velocity are varied over a wide range. Moreover, the two major characteristics of a divergence pattern, namely, the direction of and the velocity a...
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valuable as a source of spatial information. Current techniques provide flow fields which are noisy and sparse, mak ing the recovery of spatial proper ties difficul t at best. This paper describes a technique for locating discontinuities in optical flow, which typically correspond to object boundaries. A simple blurring interpolator is used to smooth out noise and produce denser fields. Discont...
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ژورنال
عنوان ژورنال: Perception & Psychophysics
سال: 1997
ISSN: 0031-5117,1532-5962
DOI: 10.3758/bf03211865