Information Visualization by Ware Colin

Author:Ware, Colin
Language: eng
Format: epub
ISBN: 9780123814654
Publisher: Elsevier Science
Published: 2012-03-30T04:00:00+00:00

Cyclopean Scale

One simple method that we developed to deal with diplopia problems is called a cyclopean scale (Ware et al., 1998). As illustrated in Figure 7.26, this manipulation involves scaling the virtual environment about the midpoint between the observer’s estimated eye positions (where the Cyclops of mythology had his one eye). The scaling variable is chosen so that the nearest part of the scene comes to a point just behind the monitor screen. To understand the effects of this operation, consider first that scaling a virtual world about a single viewpoint does not result in any change in computer graphics imagery (assuming depth of focus is not taken into account). Thus, the cyclopean scale does not change the overall sizes of objects as they are represented on a computer screen. It does change disparities, though. The cyclopean scale has a number of benefits for stereo viewing: More distant objects, which would normally not benefit from stereo viewing because they are beyond the range where significant disparities exist, are brought into a position where usable disparities are present. The vergence–focus discrepancy is reduced. At least for the part of the virtual object that lies close to the screen, there is no vergence–focus conflict. Virtual objects that are closer to the observer than to the screen are also scaled so they lie behind the screen. This removes the possibility of frame cancellation.

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