The position of an object in the visual field is a global characteristic of the object which must be determined shortly after its appearance. This characteristic is useful for organizing actions towards the object or for its better examination. A model of visual localization based on the concept of "image function" is proposed. It predicts that the centroid of a visual object determines its position. The centroid could be easily extracted from the maximum in the image function under certain conditions. Symmetry and size may influence the accuracy (absolute and relative) in locating visual objects.
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