SMOOTH AND SAMPLED MOTION
SMOOTH AND SAMPLED MOTION
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DOI：
10.1016/0042-6989(86)90012-x
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发表时间：
1986-01-01
期刊：
影响因子：
1.8
通讯作者：
MORRONE, MC
中科院分区：
文献类型：
--
作者：
BURR, DC;ROSS, J;MORRONE, MC
如果采样频率足够高，则频闪或采样运动与平滑运动是不可区分的。我们报告的漂移正弦光栅（扩展和截断），从0.06到24 c/deg的空间频率，从1.5到24 Hz的时间频率和对比度从3到100倍的检测阈值变化的平滑运动的最小采样频率的测量。平滑阈值采样频率随时间频率和对比度的增加而增加，随空间频率的增加而减少。与采样频率相关的阈值步长范围为20”弧（对于24 c/deg的光栅）至6 deg（对于0.06 c/deg的光栅）。对采样引入的杂散频率的计算使我们得出结论，如果采样高于奈奎斯特极限并且杂散分量的幅度低于其独立阈值，则运动看起来是平滑的。
Stroboscopic or sampled motion is indistinguishable from smooth motion if the frequency of sampling is sufficiently high. We report measurements of the minimum sample frequency for smooth motion of drifting sinusoidal gratings (extended and truncated) which varied in spatial frequency from 0.06 to 24 c/deg, in temporal frequency from 1.5 to 24 Hz and in contrast from 3 to 100 times detection threshold. Threshold sampling frequency for smoothness increased with temporal frequency and contrast, and inversely with spatial frequency. The threshold step size associated with the sampling frequency ranged from 20" arc (for gratings of 24 c/deg) to 6 deg (for gratings of 0.06 c/deg). Calculations of the spurious frequencies introduced by sampling lead us to conclude that motion appears smooth provided that sampling is above the Nyquist limit and that the amplitude of the spurious components is below their independent threshold.