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- W72004402 abstract "This dissertation explores the problem of inserting virtual (computer-generated) objects into natural scenes in video-based augmented-reality (AR) systems. The augmented-reality system problems addressed are the shorter-term goal of making synthetic objects appear to be more stable and registered and the longer-term goal of presenting proper occlusion and interaction cues between real and synthetic objects. These results can be achieved in video-based AR systems by directly processing video images of the natural scene in real-time. No additional hardware or additional tracking mechanisms are needed above those currently used in augmented-reality systems.The implications of this work suggest a different approach to the design of AR tracking systems in which the user's world view is used as part of the tracking process. This work shows that tracking system errors which affect the user's world view can be corrected by measuring these errors dynamically and correcting for them in a way which is not readily apparent or objectionable to the user. This means that either cheaper tracking systems could be used or possibly even no separate tracking system in certain situations. Furthermore, the user's world view can be used to construct a 3-D model of his environment which can be used to model object interaction and occlusion relations. This is the first step toward further work of properly shading and lighting synthetic objects inserted into natural scenes.A real-time (30 Hz) AR system is demonstrated which uses simple image feature tracking to improve registration and tracking accuracy. This is extended to a more general system which illustrates how reconstruction of natural scene geometry, correct synthetic and real object occlusion, and collision detection could be achieved in real-time. 3-D error analysis is included. A camera calibration appendix contains accuracy measurements." @default.
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- W72004402 date "1997-01-01" @default.
- W72004402 modified "2023-09-26" @default.
- W72004402 title "Merging real and virtual environments with video see-through head-mounted displays" @default.
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