Jan A. Mulder

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The use of specialization hierarchies in model-based vision systems may cause problems with uniformity in representation and efficiency. The concept of a discrimination graph is introduced. Such a graph facilitates the representation of hypothetical and ambiguous interpretations in a uniform and efficient way. We describe the implementation of Mapsee-3, a(More)
Schema-based representations for visual knowledge are integrated with constraint satisfaction techniques. This integration is discussed in a progression of three sketch map interpretation programs: Mapsee-1, Mapsee-2, and Mapsee-3. The programs are evaluated by the criteria of descriptive and procedural adequacy. The evaluation indicates that a schema-based(More)
Model-based vision systems must be capable of dealing with large quantities of hypothetical interpretations. Hypothesise-and-test methods often lead to combinatorial explosions of possible interpretations. Discrimination graphs prevent such explosions by imposing a hierarchical organisation on the domain of interpretation. Such an organisation effectively(More)
The effectiveness of virtual driving instruction can increase when techniques that automatically distinguish between violations and errors are available, two behaviours requiring different types of remediation. This study reports the analysis of the objectively measured performance of 520 participants completing a simulation-based training programme. Factor(More)
Flapping winged flight is well suited to the low density and highly viscous Martian atmosphere. The ExoFly demonstrator and mission concept illustrates the feasibility and usefulness of a mission to mars utilising such a rover mobility concept. Such a system would be capable of autonomous, efficient and robust flight in the lower Mars atmosphere, offering(More)
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