人眼明度视觉空间频率传递特性的研究

为描述人眼视觉系统对空间复杂颜色刺激的信息处理机制，研究人眼视觉系统空间频率信息传递的多通道特性.设计心理物理实验，测量人眼视觉系统在感知均匀色空间CIELAB明度通道上的对比度敏感度数据.实验选取明度轴上5个明度值作为颜色样本，制作明度对比度随正弦波频率调制的图像刺激序列，挑选正常视觉观察者，采集5个明度样本的12个空间频率的对比度敏感度数据.对实验数据进行相关性分析发现:单个明度样本的不同空间频率对应的观察值之间是非线性相关的；随着明度样本数量增多，观察值之间的线性相关性增强.因此，人眼视觉系统对明度颜色通道的信息处理机制可用线性模型描述；明度颜色通道的空间频率传递特性可用3条空间频率调谐曲线表征；3条空间频率调谐曲线作用的频段不同，峰值不同，表现了人眼视觉系统具有不同的空间频率感受野. 

Research of the Characteristic of the Human Lightness Vision Spatial Frequency Transfer

In order to describe the spatial color information processing mechanism of human color vision, the characteristic of lightness spatial frequency transfer in the opposition color space CIELAB was measured. Apsychophysical experiments platform was established. The five lightness values on the L-axis of CIELAB were chosen as the color sample. To each lightness value, a series of images were made, which lightness contrast was modulated with sinusoidal frequency changes. The experiment selected the normal visual observer, collected those contrast sensitivity data of the five color samples corresponding to the twelve spatial frequencies. Correlation analysis shows that the observed values of the single color sample between the different spatial frequencies are non-linear correlation; with the numbers of lightness samples increased, the linear correlation was enhanced. Therefore, the spatial frequency transfer characteristic of the human lightness visual was described by linear model. The spatial frequency transfer nature of human lightness visual can be characteristic with three spatial frequency tuning curves. The spatial frequency tuning curves has different frequency and different peak, which describe the different spatial frequency receptive fields of the human visual system.