retina by the geometry of world. The three columns represent the frequency of occurrence of projected angles based on different orientations of the sampling template (indicated by the icons below the graphs). The upper row shows the results obtained from fully natural scenes, and the lower row shows the results from environments that contained some (or mostly) human artifacts (see Figure 11.3 for examples). (After Howe and Purves, 2005. Copyright 2005 Springer Science+Business Media. With kind permission of Springer Science+Business Media.)
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