H
Hans-Hellmut Nagel
Researcher at Karlsruhe Institute of Technology
Publications - 58
Citations - 3754
Hans-Hellmut Nagel is an academic researcher from Karlsruhe Institute of Technology. The author has contributed to research in topics: Optical flow & Natural language. The author has an hindex of 21, co-authored 58 publications receiving 3709 citations.
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Proceedings Article
Constraints for the estimation of displacement vector fields from image sequences
TL;DR: Results are reported of an investigation about how an ``oriented smoothness'' constraint may be formulated and evaluated about how variations of the displacement vector field only in directions with small or no variation of gray values are restricted.
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Model-based object tracking in monocular image sequences of road traffic scenes
TL;DR: An elaborate combination of various techniques has enabled us to track vehicles under complex illumination conditions and over long monocular image sequences, and open problems as well as future work are outlined.
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An Investigation of Smoothness Constraints for the Estimation of Displacement Vector Fields from Image Sequences
TL;DR: In this article, the "oriented smoothness" constraint was introduced to restrict variations of the displacement vector field only in directions with small or no variation of gray values, which creates difficulties at gray value transitions which correspond to occluding contours.
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Tracking Persons in Monocular Image Sequences
S. Wachter,Hans-Hellmut Nagel +1 more
TL;DR: The person model is augmented by a simple motion model of constant velocity for all DOFs which is used in the prediction step of the IEKF and in the update step, both region and edge information are used.
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3D Pose Estimation by Directly Matching Polyhedral Models to Gray Value Gradients
TL;DR: This contribution addresses the problem of pose estimation and tracking of vehicles in image sequences from traffic scenes recorded by a stationary camera by directly matching polyhedral vehicle models to image gradients without an edge segment extraction process.