From: Optimum spatiotemporal receptive fields for vision in dim light Journal of Vision. 2009;9(4):18. doi:10.1167/9.4.18 Figure Legend: Modeling of image motion and light intensity. (A) Original image data of size 1536 × 1024 pixels (width × height) were taken from the natural image collection of van Hateren and van der Schaaf (1998). For stimulus creation and data analysis, square subimages of size M × M are considered. (B) A moving stimulus is created by horizontally shifting the array of visual channels (white square in A) over the image. The result is a sequence of image frames (t = 0, 1, 2,…). The time between two subsequent image frames was chosen to be 10 ms. (C) Superimposing Poisson noise results in a moving stimulus that resembles the scene gathered by the visual channels at a given light intensity. Date of download: 11/11/2017 The Association for Research in Vision and Ophthalmology Copyright © 2017. All rights reserved.