1,493 research outputs found
Beyond Context: Exploring Semantic Similarity for Tiny Face Detection
© 2018 IEEE. Tiny face detection aims to find faces with high degrees of variability in scale, resolution and occlusion in cluttered scenes. Due to the very little information available on tiny faces, it is not sufficient to detect them merely based on the information presented inside the tiny bounding boxes or their context. In this paper, we propose to exploit the semantic similarity among all predicted targets in each image to boost current face detectors. To this end, we present a novel framework to model semantic similarity as pairwise constraints within the metric learning scheme, and then refine our predictions with the semantic similarity by utilizing the graph cut techniques. Experiments conducted on three widely-used benchmark datasets have demonstrated the improvement over the-state-of-the-arts gained by applying this idea
Beyond context: Exploring semantic similarity for small object detection in crowded scenes
© 2019 Small object detection in crowded scene aims to find those tiny targets with very limited resolution from crowded scenes. Due to very little information available on tiny objects, it is often not suitable to detect them merely based on the information presented inside their bounding boxes, resulting low accuracy. In this paper, we propose to exploit the semantic similarity among all predicted objectsâ candidates to boost the performance of detectors when handling tiny objects. For this purpose, we construct a pairwise constraint to depict such semantic similarity and propose a new framework based on Discriminative Learning and Graph-Cut techniques. Experiments conducted on three widely used benchmark datasets demonstrate the improvement over the state-of-the-art approaches gained by applying this idea
Entanglement distillation using particle statistics
We extend the idea of entanglement concentration for pure states(Phys. Rev.
Lett. {\bf 88}, 187903) to the case of mixed states. The scheme works only with
particle statistics and local operations, without the need of any other
interactions. We show that the maximally entangled state can be distilled out
when the initial state is pure, otherwise the entanglement of the final state
is less than one. The distillation efficiency is a product of the diagonal
elements of the initial state, it takes the maximum 50%, the same as the case
for pure states.Comment: 3 pages, 1 figur
Anisotropic Magnetotransport and Exotic Longitudinal Linear Magnetoresistance in WTe2 Crystals
WTe2 semimetal, as a typical layered transition-metal dichalcogenide, has
recently attracted much attention due to the extremely large, non-saturating
parabolic magnetoresistance in perpendicular field. Here, we report a
systematic study of the angular dependence of the magnetoresistance in WTe2
single crystal. The violation of the Kohler rule and a significant anisotropic
magnetotransport behavior in different magnetic field directions are observed.
Surprisingly, when the applied field is parallel to the tungsten chains of
WTe2, an exotic large longitudinal linear magnetoresistance as high as 1200% at
15 T and 2 K is identified. Violation of the Kohler rule in transverse
magnetoresistance can be understood based on a dual effect of the excitons
formation and thermal activation, while large longitudinal linear
magnetoresistance reflects perfectly the scattering and nesting of quasi-1D
nature of this balanced hole-electron system. Our work will stimulate studies
of such double-carrier correlated material and corresponding quantum physics
Disulfide Promoted CâP Bond Cleavage of Phosphoramide: âPâ Surrogates to Synthesize Phosphonates and Phosphinates
Measurements of the Cross Section for e+e- -> hadrons at Center-of-Mass Energies from 2 to 5 GeV
We report values of for 85 center-of-mass energies between
2 and 5 GeV measured with the upgraded Beijing Spectrometer at the Beijing
Electron-Positron Collider.Comment: 5 pages, 3 figure
Measurement of decays to baryon pairs
A sample of 3.95M decays registered in the BES detector are used
to study final states containing pairs of octet and decuplet baryons. We report
branching fractions for , ,
, ,
, ,
, and . These results
are compared to expectations based on the SU(3)-flavor symmetry, factorization,
and perturbative QCD.Comment: 22 pages, 21 figures, 4 table
First Measurement of the Branching Fraction of the Decay psi(2S) --> tau tau
The branching fraction of the psi(2S) decay into tau pair has been measured
for the first time using the BES detector at the Beijing Electron-Positron
Collider. The result is ,
where the first error is statistical and the second is systematic. This value,
along with those for the branching fractions into e+e- and mu+mu of this
resonance, satisfy well the relation predicted by the sequential lepton
hypothesis. Combining all these values with the leptonic width of the resonance
the total width of the psi(2S) is determined to be keV.Comment: 9 pages, 2 figure
Measurement of the Total Cross Section for Hadronic Production by e+e- Annihilation at Energies between 2.6-5 Gev
Using the upgraded Beijing Spectrometer (BESII), we have measured the total
cross section for annihilation into hadronic final states at
center-of-mass energies of 2.6, 3.2, 3.4, 3.55, 4.6 and 5.0 GeV. Values of ,
, are determined.Comment: Submitted to Phys. Rev. Let
Measurement of the Inclusive Charm Cross Section at 4.03 GeV and 4.14 GeV
The cross section for charmed meson production at and 4.14
GeV has been measured with the Beijing Spectrometer. The measurement was made
using 22.3 of data collected at 4.03 GeV and 1.5
of data collected at 4.14 GeV. Inclusive observed cross sections for
the production of charged and neutral D mesons and momentum spectra are
presented. Observed cross sections were radiatively corrected to obtain tree
level cross sections. Measurements of the total hadronic cross section are
obtained from the charmed meson cross section and an extrapolation of results
from below the charm threshold.Comment: 11 pages, 13 figures. The top level tex file is paper.tex. It builds
the paper from other tex files in this .tar and the .eps file
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