Artur Ottlik

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The textual description of video sequences exploits conceptual knowledge about the behavior of depicted agents. An explicit representation of such behavioral knowledge facilitates not only the textual description of video evaluation results, but can also be used for the inverse task of generating synthetic image sequences from textual descriptions of(More)
A fully automatic initialization approach for 3D-model-based vehicle tracking has been developed, based on Edge-Element and Optical-Flow association. An entire automatic initialization and tracking system incorporating this approach achieves results comparable to those obtained by earlier experiments based on semi-interactive initialization, provided the(More)
Text-to-logic conversion is studied in a system approach which extracts a conceptual representation of temporal developments within a road traffic scene recorded by a video camera. A Fuzzy Metric Temporal Horn Logic (FMTHL) facilitates a schematic representation of road vehicle behavior at intersections. Geometric results of a model-based vehicle detection(More)
Tracking vehicles in image sequences of innercity road traffic scenes must be considered still to constitute a challenging task. Even if a-priori knowledge about the 3D shape of vehicles, of the background structure, and about vehicle motion is provided, (partial) occlusion and dense vehicle queues easily can cause initialization and tracking failures. A(More)
3D-model-based tracking offers one possibility to explicate the manner in which spatial coherence can be exploited for the analysis of image sequences. Two seemingly different approaches towards 3D-model-based tracking are compared using the same digitized video sequences of road traffic scenes. Both approaches rely on the evaluation of greyvalue(More)
An experimental comparison of 'Edge-Element Association (EEA)' and 'Marginalized Contour (MCo)' approaches for 3D model-based vehicle tracking in traffic scenes is complicated by the different shape and motion models with which they have been implemented originally. It is shown that the steering-angle motion model originally associated with EEA allows more(More)
This investigation studies the contrast across boundaries of shadows which are cast by moving vehicles or selected stationary objects in a traffic scene onto the road surface. If a sufficient fraction of this subset of hypothetical shadow contours is overlapped by strong edge elements , such a finding is usually taken as a cue that directed sunshine(More)
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