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

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Marlon Richert, Master’s Thesis, Friday, 23 February, 2007 18 • The system shall use the hardware available for the project, which includes a Polhemus ISOTRAK II with two receivers, two consumer-grade LCD video projectors with polarization filters, and a 3-year-old PC. • The system workbench shall be made of a wooden frame, a semitransparent mirror and a projection screen that will preserve the polarity of the light projected onto it. • The user shall wear polarized glasses. • The system shall be adaptable to different hardware. • The system software shall be modifiable by the MedICLab to use a different development environment than IPF. • The system shall be extendible so that the MedICLab will be able to add new features easily. • The system shall require dimmed lights but not complete darkness to function. • The system shall be small enough to fit into an office environment. • All system software shall be implemented in Python. • The system shall be developed using IPF. • The system shall be developed for the Microsoft Windows PC platform.
5 Design Marlon Richert, Master’s Thesis, Friday, 23 February, 2007 To explain the design of the proposed system, this chapter first presents a user analysis, presenting the anthropometric data and heuristics used in the design of the workbench. It does not discuss the psychological traits of the target group, as this includes a simply too broad range of people and because this project does not include the development of user application. Next, it lays out the actual design in a manner loosely based on Foley & Van Dam’s four-level approach to documenting user interface design [16]. Note, however, that because the system software is intended to be a tool for creating a user interfaces, instead of being a user interface itself, it is designed with the application programmer in mind, rather than the end user, as is usual. As such, the design is more technical and abstract than is normally the case with Foley & Van Dam’s approach and deliberately takes some liberties with it. 5.1 User Analysis We would like a large variety of people to be able to use the AR workbench, spanning the spectrum of human dimensions from a small woman to a large man. Clearly, it is impossible to be able to accommodate everyone perfectly. Instead, the design of the workbench aims to be suitable for approximately 90% of the civilian population. Unfortunately, not a lot of civilian anthropometric data is available and what is available often carries a hefty price tag for use. Since this project had only limited monetary resources, the design of the system had to make do with what was readily available, which was a summary in Wickens et al. [41] of the anthropometric data collected by the Eastman Kodak Company [12]. Table 6 lists the anthropometric data used in the design of the AR workbench. The percentiles assume a normal distribution. Table 6 Anthropometric data used in the design of the workbench [12, 41]. 5 th percentile female 50 th percentile 95 th percentile male Hand Digit two length 5 cm 9 cm Hand length 17 cm 21 cm Head Biocular breadth 9 cm 10 cm Seated Elbow rest height 18 cm 24 cm 30 cm Elbow-to-fit length 27 cm 43 cm 99 th percentile male Eye height 68 cm 76 cm 85 cm 87 cm Normal sitting height 75 cm 93 cm Midshoulder height 53 cm 60 cm 68 cm 69 cm Popliteal height 38 cm 42 cm 48 cm 19
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