15,383 research outputs found
Live User-guided Intrinsic Video For Static Scenes
We present a novel real-time approach for user-guided intrinsic decomposition of static scenes captured by an RGB-D sensor. In the first step, we acquire a three-dimensional representation of the scene using a dense volumetric reconstruction framework. The obtained reconstruction serves as a proxy to densely fuse reflectance estimates and to store user-provided constraints in three-dimensional space. User constraints, in the form of constant shading and reflectance strokes, can be placed directly on the real-world geometry using an intuitive touch-based interaction metaphor, or using interactive mouse strokes. Fusing the decomposition results and constraints in three-dimensional space allows for robust propagation of this information to novel views by re-projection.We leverage this information to improve on the decomposition quality of existing intrinsic video decomposition techniques by further constraining the ill-posed decomposition problem. In addition to improved decomposition quality, we show a variety of live augmented reality applications such as recoloring of objects, relighting of scenes and editing of material appearance
Intermediate-Mass-Elements in Young Supernova Remnants Reveal Neutron Star Kicks by Asymmetric Explosions
The birth properties of neutron stars yield important information on the
still debated physical processes that trigger the explosion and on intrinsic
neutron-star physics. These properties include the high space velocities of
young neutron stars with average values of several 100 km/s, whose underlying
"kick" mechanism is not finally clarified. There are two competing
possibilities that could accelerate NSs during their birth: anisotropic
ejection of either stellar debris or neutrinos. We here present new evidence
from X-ray measurements that chemical elements between silicon and calcium in
six young gaseous supernova remnants are preferentially expelled opposite to
the direction of neutron star motion. There is no correlation between the kick
velocities and magnetic field strengths of these neutron stars. Our results
support a hydrodynamic origin of neutron-star kicks connected to asymmetric
explosive mass ejection, and they conflict with neutron-star acceleration
scenarios that invoke anisotropic neutrino emission caused by particle and
nuclear physics in combination with very strong neutron-star magnetic fields.Comment: 24 pages, 12 figures, accepted for publication in The Astrophysical
Journa
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