García-Pérez M A
Laboratorio de Visión, Facultad de Psicologia, Universidad Complutense, Madrid, Spain.
Spat Vis. 1992;6(2):89-99.
When we fixate on a certain location in a scene, the image that our visual system provides us with is not like a snapshot of the scene. Because of visual inhomogeneity, the image we perceive is sharp and clean only around the fixation location, and it gradually blurs and loses detail with increasing distance from that location. In this paper, a procedure is presented that allows one to obtain the luminance distribution in the perceived image of a scene. The procedure is based on a stack distribution model of spatial visual processing, with parameters obtained experimentally. An application of this procedure is presented which allows an explanation of data on the decrease of visual acuity with eccentricity. The advantages of this procedure for taking visual inhomogeneity into account when seeking explanations for perceptual phenomena are also discussed.
当我们注视场景中的某个位置时，我们的视觉系统为我们提供的图像并不像场景的快照。由于视觉不均匀性，我们所感知的图像仅在注视位置周围清晰干净，并且随着与该位置距离的增加，它会逐渐模糊并失去细节。本文提出了一种方法，该方法可以让人们获得场景感知图像中的亮度分布。该方法基于空间视觉处理的堆栈分布模型，其参数通过实验获得。本文还给出了该方法的一个应用实例，该实例可以解释关于视力随偏心率降低的数据。此外，还讨论了在寻求感知现象的解释时，该方法在考虑视觉不均匀性方面的优势。
