Background. Graphical projection methods define how virtual 3D environments are depicted on 2D monitors. No projection method provides a flawless reproduction, and the look of the resulting projections vary considerably. Field of view is a parameter of these projection methods, it determines the breadth of vision of the virtual camera used in the projection process. Field of view is represented by a degree, that defines the angle from the left to the right extent of the projection, as seen from the camera. Objectives. The aim of this study was to investigate the perceived quality of high degrees of field of view, using different graphical projection methods. The Perspective, the Panini, and the Stereographic projection methods were evaluated at 110, 140, and 170 degrees of field of view. Methods. To evaluate the perceived quality of the three projection methods at varying degrees of field of view; a user study was conducted in which 24 participants rated 81 tests each. This study was held in a conference room where the participants sat undisturbed, and could experience the tests under consistent conditions. The tests took three different usage scenarios into account, presenting scenes in which the camera was still, where it moved, and where the participants could control it. Each test was rated separately, one at a time, using every combination of projection method and degree of field of view. Results. The perceived quality of each projection method dropped at an exponential rate, relative to the increase in the degree of field of view. The Perspective projection method was always rated the most favorably at 110 degrees of field of view, but unlike the other projections, it would be rated much more poorly at higher degrees. The Panini and the Stereographic projections received favorable ratings at up to 140-170 degrees, but the perceived quality of these projection methods varied significantly, depending on the usage scenario and the virtual environment displayed. Conclusions. The study concludes that the Perspective projection method is optimal for use at up to 110 degrees of field of view. At higher degrees of field of view, no consistently optimal choice remains, as the perceived quality of the Panini and the Stereographic projection method vary significantly, depending on the usage scenario. As such, the perceived quality becomes a function of the graphical projection method, the degree of field of view, the usage scenario, and the virtual environment displayed.
| Identifer | oai:union.ndltd.org:UPSALLA1/oai:DiVA.org:bth-16664 |
| Date | January 2018 |
| Creators | Napieralla, Jonah |
| Publisher | Blekinge Tekniska Högskola, Institutionen för kreativa teknologier |
| Source Sets | DiVA Archive at Upsalla University |
| Language | English |
| Detected Language | English |
| Type | Student thesis, info:eu-repo/semantics/bachelorThesis, text |
| Format | application/pdf |
| Rights | info:eu-repo/semantics/openAccess |
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