2,176 research outputs found
Co-Fusion: Real-time Segmentation, Tracking and Fusion of Multiple Objects
In this paper we introduce Co-Fusion, a dense SLAM system that takes a live
stream of RGB-D images as input and segments the scene into different objects
(using either motion or semantic cues) while simultaneously tracking and
reconstructing their 3D shape in real time. We use a multiple model fitting
approach where each object can move independently from the background and still
be effectively tracked and its shape fused over time using only the information
from pixels associated with that object label. Previous attempts to deal with
dynamic scenes have typically considered moving regions as outliers, and
consequently do not model their shape or track their motion over time. In
contrast, we enable the robot to maintain 3D models for each of the segmented
objects and to improve them over time through fusion. As a result, our system
can enable a robot to maintain a scene description at the object level which
has the potential to allow interactions with its working environment; even in
the case of dynamic scenes.Comment: International Conference on Robotics and Automation (ICRA) 2017,
http://visual.cs.ucl.ac.uk/pubs/cofusion,
https://github.com/martinruenz/co-fusio
New polytope decompositions and Euler-Maclaurin formulas for simple integral polytopes
We use a version of localization in equivariant cohomology for the
norm-square of the moment map, described by Paradan, to give several weighted
decompositions for simple polytopes. As an application, we study
Euler-Maclaurin formulas.Comment: Revision: changed content of last theorem; corrected typo
Ab Initio Electron-Phonon Interactions Using Atomic Orbital Wavefunctions
The interaction between electrons and lattice vibrations determines key
physical properties of materials, including their electrical and heat
transport, excited electron dynamics, phase transitions, and superconductivity.
We present a new ab initio method that employs atomic orbital (AO)
wavefunctions to compute the electron-phonon (e-ph) interactions in materials
and interpolate the e-ph coupling matrix elements to fine Brillouin zone grids.
We detail the numerical implementation of such AO-based e-ph calculations, and
benchmark them against direct density functional theory calculations and
Wannier function (WF) interpolation. The key advantages of AOs over WFs for
e-ph calculations are outlined. Since AOs are fixed basis functions associated
with the atoms, they circumvent the need to generate a material-specific
localized basis set with a trial-and-error approach, as is needed in WFs.
Therefore, AOs are ideal to compute e-ph interactions in chemically and
structurally complex materials for which WFs are challenging to generate, and
are also promising for high-throughput materials discovery. While our results
focus on AOs, the formalism we present generalizes e-ph calculations to
arbitrary localized basis sets, with WFs recovered as a special case
PASSATA - Object oriented numerical simulation software for adaptive optics
We present the last version of the PyrAmid Simulator Software for Adaptive
opTics Arcetri (PASSATA), an IDL and CUDA based object oriented software
developed in the Adaptive Optics group of the Arcetri observatory for
Monte-Carlo end-to-end adaptive optics simulations. The original aim of this
software was to evaluate the performance of a single conjugate adaptive optics
system for ground based telescope with a pyramid wavefront sensor. After some
years of development, the current version of PASSATA is able to simulate
several adaptive optics systems: single conjugate, multi conjugate and ground
layer, with Shack Hartmann and Pyramid wavefront sensors. It can simulate from
8m to 40m class telescopes, with diffraction limited and resolved sources at
finite or infinite distance from the pupil. The main advantages of this
software are the versatility given by the object oriented approach and the
speed given by the CUDA implementation of the most computational demanding
routines. We describe the software with its last developments and present some
examples of application.Comment: 9 pages, 2 figures, 3 tables. SPIE conference Astronomical Telescopes
and Instrumentation, 26 June - 01 July 2016, Edinburgh, Scotland, United
Kingdo
Lifting from the Deep: Convolutional 3D Pose Estimation from a Single Image
We propose a unified formulation for the problem of 3D human pose estimation
from a single raw RGB image that reasons jointly about 2D joint estimation and
3D pose reconstruction to improve both tasks. We take an integrated approach
that fuses probabilistic knowledge of 3D human pose with a multi-stage CNN
architecture and uses the knowledge of plausible 3D landmark locations to
refine the search for better 2D locations. The entire process is trained
end-to-end, is extremely efficient and obtains state- of-the-art results on
Human3.6M outperforming previous approaches both on 2D and 3D errors.Comment: Paper presented at CVPR 1
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