The AR Workbench: A Complete Co-located Reach-in Mirror-Based ...

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Marlon Richert, Master’s Thesis, Friday, 23 February, 2007 the magnetic tracker. The transmitter has two magnetic hemispheres whose coordinate systems are each other’s mirror images. In other words, when on receiver crosses from one hemisphere to the other, its coordinates flip. Unfortunately, there is no way of telling in which hemisphere a receiver is currently located. Therefore, the transmitter sits at an angle to make sure that both receivers are in the same hemisphere and stay there. Figure 11 Virtual prototype of the workbench frame, showing the projection screen (top) and the projectors (blue, bottom). The mirror sits as high as possible in the frame, in order to provide the largest possible interaction space. It still sits low enough, however, that even a 5 th - percentile female will be able to use the system. If we want the reflected screen to be very near the work surface, putting the mirror as high as possible also makes it possible to the projection screen as high as possible, creating more space for tall people to use the system. Indeed, a 95 th -percentile male has ample space above his head when using the system. Putting the screen as high as possible also makes the distance between the screen and the projectors as big as possible and thus the projected image as large as possible. To enable the user to make full use of the large virtual space enabled by this projection area, the frame sports a very wide work surface, thus giving the user plenty of space to move around and position the virtual objects with which they interact. The work surface is purposely shallow, though, so a 5 th -percentile female will be able to reach all of the virtual content even when it sits at the far edge of the work surface. This is to minimize the chance of the user bumping into or pushing against the mirror. The human-shaped dummy in the figure is about 1.78 m tall. Note, however, that it is sitting too low: When it looks at the far side of the works surface, it is not looking through the mirror. To be sitting correctly, the user should be looking through the mirror when looking at their hands. Clearly, most people will need to sit a bit higher than what they are accustomed to, even though the work surface is located at the same height as the MedICLab’s standard issue desks (75 cm). Making the work surface lower, however, would not allow enough space for tall people to 26
Marlon Richert, Master’s Thesis, Friday, 23 February, 2007 use the system. Thus, the user will need a well-adjustable desk chair to be able to use the workbench. Very short people will also require footrests to be able to sit comfortably. Figure 12 Virtual prototype of the workbench frame, as seen from the side, showing the projection screen (white, top), transmitter unit of the magnetic tracker (blue, center), and the projectors (blue, bottom). 27
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