AFTERIMAGES OF SINUSOIDAL, SQUARE-WAVE AND COMPOUND GRATINGS
AFTERIMAGES OF SINUSOIDAL, SQUARE-WAVE AND COMPOUND GRATINGS
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DOI：
10.1016/0042-6989(85)90143-9
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发表时间：
1985-01-01
期刊：
影响因子：
1.8
通讯作者：
TURNER, RSE
中科院分区：
文献类型：
--
作者：
GEORGESON, MA;TURNER, RSE
在低空间频率下稳定地固定正弦光栅后，观察到负的后像，并使用对比度匹配和消除方法进行量化。余像对比度是曝光的幂函数，定义为检查对比度和检查持续时间的乘积。一个单一的函数，在对数对数图上是线性的，描述了不同空间频率、对比度和持续时间的光栅的后像。匹配法得到的斜率(约0.42)低于对消法(0.62)，这可能是因为对比度自适应在第一种方法中减弱了感知的余像对比度，但第二种方法没有。方波光栅和含有两个或三个谐波分量的光栅产生的余像(通过对比度匹配进行评估)比正弦波要弱得多。对比度调整可能再次起到了作用。对比度知觉的半场不对称被注意到。真实光栅和后像的对比度几乎是相加的，特别是在低曝光时，但结果不能区分“局部适应”的线性滤波和增益控制模型。
Negative afterimages were observed after steady fixation of sinusoidal gratings at low spatial frequencies, and quantified using contrast-matching and cancellation methods. Afterimage contrast increased as a power function of "exposure", defined as the product of inspection contrast and inspection duration. A single function, linear on a log-log plot, describes the afterimages of gratings at different spatial frequencies, contrasts and durations. The matching method yielded a lower slope (about 0.42) than the cancellation method (0.62), probably because contrast adaptation attenuates perceived afterimage contrast in the first method, but not the second. Square-wave gratings, and those containing two or three harmonic components gave much weaker afterimages (assessed by contrast-matching) than sine-waves did. Contrast adaptation may again be responsible. Hemi-field asymmetries in contrast perception were noted. The contrast of real gratings and afterimages was nearly additive, especially at lower exposures, but the results cannot distinguish between linear filter and gain control models of "local adaptation".