DISCRIMINATION THRESHOLDS IN THE TWO-DIMENSIONAL SPATIAL-FREQUENCY DOMAIN
DISCRIMINATION THRESHOLDS IN THE TWO-DIMENSIONAL SPATIAL-FREQUENCY DOMAIN
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DOI：
10.1016/0042-6989(83)90135-9
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发表时间：
1983-01-01
期刊：
影响因子：
1.8
通讯作者：
HILZ, R
中科院分区：
文献类型：
--
作者：
CAELLI, T;BRETTEL, H;HILZ, R
在两个实验中，确定了两个正弦光栅之间的可分辨性作为方向和空间频率差的函数。方位（12）（15度）考虑步长)和4个空间频率（2、4、8、12 c[周期]/度[度]），并确定相应的识别阈值[在人类中]。空间频率识别阈值在所有频率和方向位置上没有显著变化，平均为。+-。1/8倍频程限制。方向阈值仅随着空间频率的增加而略有增加(从。+-。5.学位。在摄氏2度/度的温度下。6.学位。12℃/℃)。取向阈值在水平方向和垂直方向最敏感，在斜角处阈值最大，各向异性较大且一致。空间频率阈值未观察到斜向效应。过去的观察得到了证实；在二维空间域中提供了一套广泛的阈值测量。
In 2 experiments the discriminability between 2 sinusoidal gratings was determined as a function of orientation and spatial frequency differences. Orientation (12) (15.degree. steps) and 4 spatial frequencies (2, 4, 8, 12 c[cycle]/deg [degree]) were considered and corresponding discrimination thresholds were determined [in humans]. Spatial frequency discrimination thresholds did not significantly vary over all frequency and orientation positions and averaged at .+-. 1/8 octave limits. Orientation thresholds only slightly increased with spatial frequency (from .+-. 5.degree. at 2 c/deg to .+-. 6.degree. at 12 c/deg). A large and consistent anisotropy occurred with orientation thresholds showing most sensitivity in the horizontal and vertical directions, with largest thresholds at the oblique angles. No oblique effect was observed with spatial frequency thresholds. Past observations were confirmed; an extensive set of threshold measurements in the 2-dimensional spatial domain was provided.