1,124 research outputs found
Plane-Based Optimization of Geometry and Texture for RGB-D Reconstruction of Indoor Scenes
We present a novel approach to reconstruct RGB-D indoor scene with plane
primitives. Our approach takes as input a RGB-D sequence and a dense coarse
mesh reconstructed by some 3D reconstruction method on the sequence, and
generate a lightweight, low-polygonal mesh with clear face textures and sharp
features without losing geometry details from the original scene. To achieve
this, we firstly partition the input mesh with plane primitives, simplify it
into a lightweight mesh next, then optimize plane parameters, camera poses and
texture colors to maximize the photometric consistency across frames, and
finally optimize mesh geometry to maximize consistency between geometry and
planes. Compared to existing planar reconstruction methods which only cover
large planar regions in the scene, our method builds the entire scene by
adaptive planes without losing geometry details and preserves sharp features in
the final mesh. We demonstrate the effectiveness of our approach by applying it
onto several RGB-D scans and comparing it to other state-of-the-art
reconstruction methods.Comment: in International Conference on 3D Vision 2018; Models and Code: see
https://github.com/chaowang15/plane-opt-rgbd. arXiv admin note: text overlap
with arXiv:1905.0885
The Incomplete Conditional Stellar Mass Function: Unveiling the Stellar Mass Functions of Galaxies at 0.1 < Z < 0.8 from BOSS Observations
We propose a novel method to constrain the missing fraction of galaxies using
galaxy clustering measurements in the galaxy conditional stellar mass function
(CSMF) framework, which is applicable to surveys that suffer significantly from
sample selection effects. The clustering measurements, which are not sensitive
to the random sampling (missing fraction) of galaxies, are widely used to
constrain the stellar-halo mass relation (SHMR). By incorporating a missing
fraction (incompleteness) component into the CSMF model (ICSMF), we use the
incomplete stellar mass function and galaxy clustering to simultaneously
constrain the missing fractions and the SHMRs. Tests based on mock galaxy
catalogs with a few typical missing fraction models show that this method can
accurately recover the missing fraction and the galaxy SHMR, and hence provides
us reliable measurements of the galaxy stellar mass functions. We then apply it
to the Baryon Oscillation Spectroscopic Survey (BOSS) over the redshift range
of 0.110^{11}M_\odot10^{11}M_\odot<M_*<10^{12}M_\odot$, as well as the SHMRs, over the redshift
range 0.1<z<0.8 in this largest galaxy redshift survey.Comment: 18 pages, 12 figures. Accepted for publication in Ap
Galaxy-halo size relation from Sloan Digital Sky Survey Data Release 7 and the ELUCID simulation
Based on galaxies in the Sloan Digital Sky Survey Data Release 7 (SDSS DR7)
and dark matter haloes in the dark matter only, cosmological and constrained
ELUCID simulation, we investigate the relation between the observed radii of
central galaxies with stellar mass and the
virial radii of their host dark matter haloes with virial mass , and the dependence of galaxy-halo size relation
on the halo spin and concentration. Galaxies in observation are matched to dark
matter (sub-)haloes in the ELUCID simulation using a novel neighborhood subhalo
abundance matching method. For galaxy 2D half-light radii , we find
that early- and late-type galaxies have the same power-law index 0.55 with
, although early-type galaxies have smaller
2D half-light radii than late-type galaxies at fixed halo virial radii. When
converting the 2D half-light radii to 3D half-mass radii ,
both early- and late-type galaxies display similar galaxy-halo size relations
with . We
find that the galaxy-halo size ratio decreases with
increasing halo mass. At fixed halo mass, there is no significant dependence of
galaxy-halo size ratio on the halo spin or concentration.Comment: 10 pages, 8 figures, accepted for publication in MNRA
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