HOW SURROUNDS AFFECT CHROMATICITY DISCRIMINATION
HOW SURROUNDS AFFECT CHROMATICITY DISCRIMINATION
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DOI：
10.1364/josaa.10.000545
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发表时间：
1993-04-01
影响因子：
1.9
通讯作者：
POKORNY, J
中科院分区：
文献类型：
--
作者：
MIYAHARA, E;SMITH, VC;POKORNY, J
沿着色度空间的两个基轴测量有或没有环绕的色度辨别阈值。在一个轴上，对于恒定的长波长敏感 (LWS) 锥体和中波长敏感 (MWS) 锥体激励，短波长敏感 (SWS) 锥体激励水平有所不同，而在另一轴上，对于恒定的 SWS 锥体激励水平，LWS 锥体和 MWS 锥体激励存在相等和相反的变化。三名观察者中的两名的结果表明，在黑暗的环境中，SWS 锥体介导的辨别力受到起始色度的 SWS 锥体激发水平的调节，显示出阈值与辐射度函数形式的函数。对于等亮度的白色或黄色环绕，所有三个观察者的辨别力在环绕的 SWS 锥体激励水平上显示为最小值，从而为白色环绕提供了 V 形函数。另一项使用较暗白色边框的实验表明，虽然最小值保持在白点，但函数逐渐变为具有深色边框的形状。由具有黑暗环绕的 LWS 和 MWS 锥体介导的辨别阈值在等能量白光的 LWS 锥体激发附近显示出最小值，给出 V 形函数。黄色和白色环绕的效果是加深 V。数据可以通过色度辨别模型来描述，该模型将阈值项、锥体增益控制和对手增益控制合并到两个方程中，一个用于 SWS 锥体辨别，另一个用于 LWS 锥体和 MWS 锥体辨别。
Chromatic discrimination thresholds were measured with and without surrounds along two cardinal axes of chromaticity space. On one axis the level of short-wavelength-sensitive (SWS)-cone excitation was varied for constant long-wavelength-sensitive (LWS)-cone and medium-wavelength-sensitive (MWS)-cone excitations, and on the other axis there were equal and opposite changes in LWS-cone and MWS-cone excitations for constant levels of SWS-cone excitation. Results for two of three observers showed that with a dark surround, discrimination mediated by SWS cones was regulated by the level of SWS-cone excitation of the starting chromaticity, showing a function with the form of a threshold-versus-radiance function. For an equiluminant white or yellow surround, the discrimination for all three observers showed a minimum at the level of SWS-cone excitation of the surround, giving a V-shaped function for the white surround. An additional experiment with dimmer white surrounds indicated that while the minimum remained at the white point, the function gradually changed toward the shape with a dark surround. Discrimination thresholds mediated by LWS and MWS cones with a dark surround showed a minimum near the LWS-cone excitation of equal-energy white, giving a V-shaped function. The effect of yellow and white surrounds was to deepen the V The data can be described by a model of chromatic discrimination incorporating a threshold term, a cone gain control, and an opponent gain control into two equations, one for SWS-cone discrimination and one for LWS-cone and MWS-cone discrimination.