Motion As A Cue To Depth A Kinetic Depth Effect

Relative motion can provide several different views of an object over time and information from these different views can reveal the 3D structure of the object. This is loosely analogous to the way stereo vision combines views from the two eyes to give depth information; since the eyes are horizontally displaced in the head, each eye provides a slightly different view of the world. These different views can be used to extract the relative depths in the image. We first consider the kinetic depth effect, where an object moves with respect to a stationary observer. Hans Wallach demonstrated this effect by projecting the image of an object rotating about a vertical (or horizontal) axis on to a screen. The object was a rigid 3D shape made up of a wire frame. The shadow of the moving object on the screen convincingly gave rise to the percept of a solid shape, showing that humans are able to integrate motion information to recover the 3D structure of objects.

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