Snyder A W, Srinivasan M V
Biol Cybern. 1979 Feb 2;32(1):9-17. doi: 10.1007/BF00337446.
The hypothesis that neural processing in the human visual pathways compensates for both optical degradation as well as noise contamination at the photoreceptor level is introduced and shown to be consistent with the high frequency portion of the contrast sensitivity function for threshold detection of sinusoidal gratings in addition to the suprathreshold phenomenon of matching sinusoidal gratings of different spatial frequencies. This offers a unifying interpretation for why, at threshold conditions, the high spatial frequency portion of the image is blurred as severely by the nervous system as it is by the optics (e.g. Campbell and Green, 1965) while in extreme suprathreshold conditions the nervous system effectively deblurs the image (e.g. Georgeson and Sullivan, 1975; Kulikowski, 1976). These conclusions do not necessitate a highly specific form of visual processing such as Fourier channeling.
本文提出了一个假设，即人类视觉通路中的神经处理过程既能补偿光感受器水平上的光学退化，也能补偿噪声污染。研究表明，该假设不仅与用于正弦光栅阈值检测的对比度敏感函数的高频部分一致，还与匹配不同空间频率的正弦光栅的超阈值现象相符。这为以下现象提供了统一的解释：在阈值条件下，图像的高空间频率部分被神经系统模糊的程度与被光学系统模糊的程度一样严重（例如Campbell和Green，1965年）；而在极端超阈值条件下，神经系统能有效地使图像去模糊（例如Georgeson和Sullivan，1975年；Kulikowski，1976年）。这些结论并不需要特定形式的高度专业化视觉处理，如傅里叶通道化。
