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Label placement for dynamic objects

Kämpke T.

Machine Graphics and Vision

2003

Vol. 12, No. 2

215-234

Placing object labels in dynamic scenes requires the label positions themselves to be dynamic. Algorithms for dynamic label placement are presented that tend to avoid overlaps and consider aesthetic preferences. The procedures are derived from a quadratic program. As a special feature, hysteresis is incorporated to restrict the optical flow induced by label changes.

Interfacing graphs

Kämpke T.

Machine Graphics and Vision

2000

Vol. 9, No. 4

797-824

Transformations of vertex sequences of regular grid graph into paths of an arbitrary connected graph are facilitated according to various coarsening and approximation operations, including minimum cost alterations and minimum cost re-routings. The sequence transformations are supposed to support issues of man-machine interaction, which implies lack of an ultimate formal design objective. Furthermore, this implies that formal methods and algorithms have to be combined in a pragmatic fashion. For planar graph, the notion of Voronoi regions is modified to graph Voronoi regions which partition the plane according to proximity to verttices and edges simultaneously. The non-planar case is reduced to the planar case by adding all intersection points of vertex connections to the original vertex set and by splitting vertex connections accordingly. This allows grid point sequences to be intermediately transformed to so-called mixed or region sequences which are eventualy transformed to vertex sequences by production rule-like operations. The algorithmic preprocessing burden of partitioning and indexing the euclidean plane via the graph Voronoi regions or approximations thereof is practically larger and typically more complicated than any of the run time computations.