5,460 research outputs found
Temporally coherent 4D reconstruction of complex dynamic scenes
This paper presents an approach for reconstruction of 4D temporally coherent
models of complex dynamic scenes. No prior knowledge is required of scene
structure or camera calibration allowing reconstruction from multiple moving
cameras. Sparse-to-dense temporal correspondence is integrated with joint
multi-view segmentation and reconstruction to obtain a complete 4D
representation of static and dynamic objects. Temporal coherence is exploited
to overcome visual ambiguities resulting in improved reconstruction of complex
scenes. Robust joint segmentation and reconstruction of dynamic objects is
achieved by introducing a geodesic star convexity constraint. Comparative
evaluation is performed on a variety of unstructured indoor and outdoor dynamic
scenes with hand-held cameras and multiple people. This demonstrates
reconstruction of complete temporally coherent 4D scene models with improved
nonrigid object segmentation and shape reconstruction.Comment: To appear in The IEEE Conference on Computer Vision and Pattern
Recognition (CVPR) 2016 . Video available at:
https://www.youtube.com/watch?v=bm_P13_-Ds
Generic Rigidity Matroids with Dilworth Truncations
We prove that the linear matroid that defines generic rigidity of
-dimensional body-rod-bar frameworks (i.e., structures consisting of
disjoint bodies and rods mutually linked by bars) can be obtained from the
union of graphic matroids by applying variants of Dilworth
truncation times, where denotes the number of rods. This leads to
an alternative proof of Tay's combinatorial characterizations of generic
rigidity of rod-bar frameworks and that of identified body-hinge frameworks
- β¦