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<p>The sources of visual information that must be present to correctly interpret spatial relations in images, the relative importance of different visual information sources with regard to metric judgments of spatial relations in images, and the ways that the task in which the images are used affect the visual information's usefulness are discussed. Cue theory, which states that the visual system computes the distances of objects in the environment based on information from the posture of the eyes and from the patterns of light projected onto the retinas by the environment, is presented. Three experiments in which the influence of pictorial cues on perceived spatial relations in computer-generated images was assessed are discussed. Each experiment examined the accuracy with which subjects matched the position, orientation, and size of a test object with a standard by interactively translating, rotating, and scaling the test object.</p>

L. C. Wanger, D. P. Greenberg and J. A. Ferwerda, "Perceiving Spatial Relationships in Computer-Generated Images," in IEEE Computer Graphics and Applications, vol. 12, no. , pp. 44-51, 54-58, 1992.
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