Items of the same size form smaller images when they

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items of the same size form smaller images when they are farther away Relative size and relative height both provide some metrical information. Relative metrical depth cue: A depth cue that could specify that object A is twice as far away as object B without providing information about the absolute distance to either A or B These cues give the visual system more information than nonmetrical cue like occlusion. Texture gradients result from a combination of the cues of relative size and relative height B. Monocular Cues to Three-Dimensional Space Relative height, relative size, texture gradient
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4 B. Monocular Cues to Three-Dimensional Space B. Monocular Cues to Three-Dimensional Space 5. Familiar size: A cue based on knowledge of the typical size of objects Familiar size can provide precise metrical information if your visual system knows the actual size of the object and the visual angle it takes up on the retina B. Monocular Cues to Three-Dimensional Space Epstein’s (1965) familiar -size experiment. B. Monocular Cues to Three-Dimensional Space 6. Aerial perspective: A depth cue based on the implicit understanding that light is scattered by the atmosphere More light is scattered when we look through more atmosphere Thus, more distant objects appear fainter, bluer, and less distinct
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5 B. Monocular Cues to Three-Dimensional Space Aerial perspective Aerial perspective Monocular Cues to Three-Dimensional Space 7. Linear perspective: Lines that are parallel in the three-dimensional world will appear to converge in a two-dimensional image as they extend into the distance 8. Vanishing point: The apparent point at which parallel lines receding in depth converge Linear perspective and vanishing point
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