同心圆感受野去抑制特性的数学模拟

以感受野外周区内各亚区之间的抑制性相互作用为基础，提出了一个能描述视网膜神经节细胞传输特性的数学模型，此模型能很好地解释传统感受野外大范围去抑制区产生的机制。当用来处理亮度对比边缘时，它既能很好地增强边缘对比，又可有效地提升被传统感受野中心／外周拮抗机制所滤除了的区域亮度对比和亮度梯度信息。本文也用不同空间频率的光栅和真实图像检验了模型的空间频率传递特性，并与其它模型进行了比较。

MATHEMATICAL SIMULATION OF DISINHIBITORY PROPERTIES OF CONCENTRIC RECEPTIVE FIELD

A mathematical model is propose bed on the mutual inhibition among the subunits within receptive field surround. The model may well describe the txansfer property of retinal ganglion cells and explain the mechanism of genesis of the extensive disinhibitory region beyond the cAntoal receptive field. When testing with a luminance contrast border, the new model can not noly enhance the bolder contrast, but also efficlently recover the area luminance contrast and luminance gradient information which were filtered by the center/stirround mechanism of the classical receptive field. Using a luminance grating containing different spatinl frequencies and a real image, the spatial frequency transfer property of the model has heen tested and compared with the other model.