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Control-Display Mapping with Three Translational Degrees of Freedom.

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Final rept.,

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Situations in which the human operator must control three translational degrees of freedom are common in, for example, control of robot arms, remotely controlled cameras, and tele-surgery. Often, the operator has no direct view on the controlled object, but receives information on the motions of the object via a camera - monitor system or a simplified graphical display. In the design of such systems, it is important that the mapping of the motions directions of the input device and the controlled object are compatible for the human operator. A compatible relation will lead to faster reaction times, faster learning and less errors. For this relation, two mapping principles may be distinguished. The first is a mapping in which the motions of the input device and the controlled object are always parallel in 3D space spatial-motion mapping. The second principle is a mapping in which the motions are parallel by comparison with the ground planes they are located or displayed in reference-plane mapping. These ground planes often are not parallel, for example a monitor placed on the operator table in which the control is located. When the ground plane of the device and the object are not parallel, both principles will lead to a different mapping. The literature on tasks with two degrees of freedom shows that reference-plane mapping is the more compatible mapping principle. However, the question is whether these results are valid for 3D tasks as well. Research on control - display mapping for three translational degrees of freedom is scarce. A previous experiment at the TNO Human Factors Research Institute showed an advantage of reference-plane mapping. Nonetheless, there are indications that this advantage is caused by the restrained 3D visual depth cues, which encouraged subjects to experience the task as a 2D task with a third dimension added.

Subject Categories:

  • Cartography and Aerial Photography
  • Computer Programming and Software

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