303 research outputs found
LAND RENTAL MARKET DEVELOPMENT AND AGRICULTURAL PRODUCTION IN CHINA
The development of a land rental market in China may help stimulate further increases in agricultural production. This paper provides a description of land rental transactions in rural China, analyzes the determinants of land supply and demand and estimates the implications land rental activity has for increasing agricultural production.Land Economics/Use,
Detail-preserving and Content-aware Variational Multi-view Stereo Reconstruction
Accurate recovery of 3D geometrical surfaces from calibrated 2D multi-view
images is a fundamental yet active research area in computer vision. Despite
the steady progress in multi-view stereo reconstruction, most existing methods
are still limited in recovering fine-scale details and sharp features while
suppressing noises, and may fail in reconstructing regions with few textures.
To address these limitations, this paper presents a Detail-preserving and
Content-aware Variational (DCV) multi-view stereo method, which reconstructs
the 3D surface by alternating between reprojection error minimization and mesh
denoising. In reprojection error minimization, we propose a novel inter-image
similarity measure, which is effective to preserve fine-scale details of the
reconstructed surface and builds a connection between guided image filtering
and image registration. In mesh denoising, we propose a content-aware
-minimization algorithm by adaptively estimating the value and
regularization parameters based on the current input. It is much more promising
in suppressing noise while preserving sharp features than conventional
isotropic mesh smoothing. Experimental results on benchmark datasets
demonstrate that our DCV method is capable of recovering more surface details,
and obtains cleaner and more accurate reconstructions than state-of-the-art
methods. In particular, our method achieves the best results among all
published methods on the Middlebury dino ring and dino sparse ring datasets in
terms of both completeness and accuracy.Comment: 14 pages,16 figures. Submitted to IEEE Transaction on image
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Unusual behavior of sound velocity of a Bose gas in an optical superlattice at quasi-one-dimension
A Bose gas trapped in a one-dimensional optical superlattice has emerged as a
novel superfluid characterized by tunable lattice topologies and tailored band
structures. In this work, we focus on the propagation of sound in such a novel
system and have found new features on sound velocity, which arises from the
interplay between the two lattices with different periodicity and is not
present in the case of a condensate in a monochromatic optical lattice.
Particularly, this is the first time that the sound velocity is found to first
increase and then decrease as the superlattice strength increases even at one
dimension. Such unusual behavior can be analytically understood in terms of the
competition between the decreasing compressibility and the increasing effective
mass due to the increasing superlattice strength. This result suggests a new
route to engineer the sound velocity by manipulating the superlattice's
parameters. All the calculations based on the mean-field theory are justified
by checking the exponent of the off-diagonal one-body density matrix
that is much smaller than 1. Finally, the conditions for possible experimental
realization of our scenario are also discussed.Comment: 10 pages, 5 figure
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