Klein S A, Levi D M
J Opt Soc Am A. 1985 Jul;2(7):1170-90. doi: 10.1364/josaa.2.001170.
Bisection thresholds were measured as a function of the separation of the lines. For separations of less than 1.5 min, the addition of flanking lines facilitates bisection so that thresholds of less than 1 sec for discriminating the direction of offset could be reliably obtained. For larger separations an interval could be bisected to an accuracy of 1 part in 60. Experiments varying the length, luminance, and overlap of the lines suggest that different cues are used in these two regimes. A dual space-size analysis is presented that can account for these bisection thresholds over a wide range of experimental conditions. This quantitative analysis produces viewprints of the stimuli (analogous to the voiceprint of audition). Each viewprint shows the output of many spatial filters of different positions and sizes. A new filter shape is introduced that has advantages for modeling the visual system. The sensitivity of each filter is fixed by the contrast-response function. The analysis further shows that the limiting factors in spatial hyperacuity are both the contrast-response function and the spatial grain.
二等分阈值是作为线间距的函数来测量的。对于小于1.5分钟的间距，添加侧翼线有助于二等分，从而能够可靠地获得小于1秒的辨别偏移方向的阈值。对于更大的间距，一个间隔可以被二等分至1/60的精度。改变线的长度、亮度和重叠的实验表明，在这两种情况下使用了不同的线索。提出了一种双空间大小分析方法，该方法可以在广泛的实验条件下解释这些二等分阈值。这种定量分析产生了刺激的视图印记（类似于听觉的声纹）。每个视图印记显示了许多不同位置和大小的空间滤波器的输出。引入了一种新的滤波器形状，它在对视觉系统进行建模方面具有优势。每个滤波器的灵敏度由对比度响应函数确定。分析进一步表明，空间超敏锐度的限制因素是对比度响应函数和空间粒度。
