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Chapter 1: The Physiology of 3D Perception > 1.3 Distance Scaling of Disparity

1.3 Distance Scaling of Disparity

In stereopsis there are two definitions of perceived distance or depth. The egocentric view refers to the conventional distance D between an observer and an object and is usually measured in m. On the other hand, relative depth is based on the depth interval between a viewer and the reference point on the horopter circle and is measured in radians of the disparity ? on the retina in Figure 1.1. The disparity information ? is connected to D by a strongly nonlinear relation stemming from the geometry shown in Figure 1.1. This relation has to be differently approximated or recalibrated or, in other words, scaled for different regions of distance D [19, 20].

For obtaining a veridical or true value, egocentric distance information D together with the relative depth ? are needed by the brain. It is assumed that the brain combines binocular disparity ? with egocentric distance cues for the process of disparity scaling.


  

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