Detection of chromoluminance patterns on chromoluminance pedestals II: model
Detection of chromoluminance patterns on chromoluminance pedestals II: model
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DOI：
10.1016/s0042-6989(99)00228-x
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发表时间：
2000-01-01
期刊：
影响因子：
1.8
通讯作者：
Brainard, DH
中科院分区：
文献类型：
--
作者：
Chen, CC;Foley, JM;Brainard, DH
本文描述了一个彩色发光模式检测和基座效应的模型。这个模型有五个阶段。刺激首先由圆锥阵列处理，然后由颜色空间线性算子处理。线性算子的输出可以表示为空间上锥对比的加权和。模型中有三个符号相反的线性空间算子对。它们在空间中的每个点处的光谱调谐类似于颜色对手模型中的亮度、绿色/红色和蓝色/黄色机制，但是它们对视锥输入的灵敏度作为空间的函数而变化。每一对中的算子都是相同的，只是其中一个中的圆锥输入的符号与另一个中的圆锥输入的符号相反。每个线性运算符之后都有一个非线性响应运算符。它接受两种输入，一种是兴奋性的，另一种是分裂性的抑制性的。激励输入是线性算子之一的半波整流输出。抑制输入是所有线性算子输出的非线性和。非线性响应运算符将兴奋性输入提高到一个幂，并将其除以抑制性输入加上一个常数以产生响应。检测变量的计算方法是将三个非线性算子对目标加基座和单独基座的响应差异结合起来。该模型很好地解释了在配套文件中提出的大数据集，并与文献中的其他结果基本一致。所推断的色发光模式机制的光谱灵敏度与用不同方法得到的结果相似。该数据集被证明是与其他几个模型不一致。(C)2000爱思唯尔科技有限公司。保留所有权利。
A model for chromoluminance pattern detection and pedestal effects is described. This model has five stages. The stimulus is first processed by the cone array and then by color-spatial linear operators. The outputs of the linear operators may be expressed as weighted sums of cone contrasts over space. There are three opposite sign-pairs of linear spatial operators in the model. Their spectral:tuning at each point in space is similar to the luminance, green/red and blue/yellow mechanisms in color opponent models, but their sensitivity to cone inputs varies as a function of space. The operators in each pair are the same except that the signs of the cone inputs in one are the opposite of those in the other. A non-linear response operator follows each linear operator. It receives two inputs, one excitatory and the other divisive inhibitory. The excitatory input is the half-wave rectified output of one of the linear operators. The inhibitory input is a non-linear sum of all linear operator outputs. The non-linear response operator raises the excitatory input to a power, and divides it by the inhibitory input plus a constant to produce the response. The detection variable is computed by combining the difference in response to target-plus-pedestal and pedestal alone across the three non-linear operators. The model accounts well for the large data set presented in the companion paper and is generally consistent with other results in the literature. The spectral sensitivities of,the inferred chromoluminance pattern mechanisms are similar to those obtained with different methods. The data set is shown to be inconsistent with several other models. (C) 2000 Elsevier Science Ltd. All rights reserved.