3,238 research outputs found
MVPNet: Multi-View Point Regression Networks for 3D Object Reconstruction from A Single Image
In this paper, we address the problem of reconstructing an object's surface
from a single image using generative networks. First, we represent a 3D surface
with an aggregation of dense point clouds from multiple views. Each point cloud
is embedded in a regular 2D grid aligned on an image plane of a viewpoint,
making the point cloud convolution-favored and ordered so as to fit into deep
network architectures. The point clouds can be easily triangulated by
exploiting connectivities of the 2D grids to form mesh-based surfaces. Second,
we propose an encoder-decoder network that generates such kind of multiple
view-dependent point clouds from a single image by regressing their 3D
coordinates and visibilities. We also introduce a novel geometric loss that is
able to interpret discrepancy over 3D surfaces as opposed to 2D projective
planes, resorting to the surface discretization on the constructed meshes. We
demonstrate that the multi-view point regression network outperforms
state-of-the-art methods with a significant improvement on challenging
datasets.Comment: 8 pages; accepted by AAAI 201
RMSE-ELM: Recursive Model based Selective Ensemble of Extreme Learning Machines for Robustness Improvement
Extreme learning machine (ELM) as an emerging branch of shallow networks has
shown its excellent generalization and fast learning speed. However, for
blended data, the robustness of ELM is weak because its weights and biases of
hidden nodes are set randomly. Moreover, the noisy data exert a negative
effect. To solve this problem, a new framework called RMSE-ELM is proposed in
this paper. It is a two-layer recursive model. In the first layer, the
framework trains lots of ELMs in different groups concurrently, then employs
selective ensemble to pick out an optimal set of ELMs in each group, which can
be merged into a large group of ELMs called candidate pool. In the second
layer, selective ensemble is recursively used on candidate pool to acquire the
final ensemble. In the experiments, we apply UCI blended datasets to confirm
the robustness of our new approach in two key aspects (mean square error and
standard deviation). The space complexity of our method is increased to some
degree, but the results have shown that RMSE-ELM significantly improves
robustness with slightly computational time compared with representative
methods (ELM, OP-ELM, GASEN-ELM, GASEN-BP and E-GASEN). It becomes a potential
framework to solve robustness issue of ELM for high-dimensional blended data in
the future.Comment: Accepted for publication in Mathematical Problems in Engineering,
09/22/201
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Spatiotemporal establishment of dense bacterial colonies growing on hard agar.
The physical interactions of growing bacterial cells with each other and with their surroundings significantly affect the structure and dynamics of biofilms. Here a 3D agent-based model is formulated to describe the establishment of simple bacterial colonies expanding by the physical force of their growth. With a single set of parameters, the model captures key dynamical features of colony growth by non-motile, non EPS-producing E. coli cells on hard agar. The model, supported by experiment on colony growth in different types and concentrations of nutrients, suggests that radial colony expansion is not limited by nutrients as commonly believed, but by mechanical forces. Nutrient penetration instead governs vertical colony growth, through thin layers of vertically oriented cells lifting up their ancestors from the bottom. Overall, the model provides a versatile platform to investigate the influences of metabolic and environmental factors on the growth and morphology of bacterial colonies
KBNN Based on Coarse Mesh to Optimize the EBG Structures
The microwave devices are usually optimized by combining the precise model with global optimization algorithm. However, this method is time-consuming. In order to optimize the microwave devices rapidly, the knowledge-based neural network (KBNN) is used in this paper. Usually, the a priori knowledge of KBNN is obtained by the empirical formulas. Unfortunately, it is difficult to derive the corresponding formulas for the most electromagnetic problems, especially for complex electromagnetic problems; the formula derivation is almost impossible. We use precise mesh model of EM analysis as teaching signal and coarse mesh model as a priori knowledge to train the neural network (NN) by particle swarm optimization (PSO). The NN constructed by this method is simpler than traditional NN in structure which can replace precise model in optimization and reduce the computing time. The results of electromagnetic band-gap (EBG) structures optimally designed by this kind of KBNN achieve increase in the bandwidth and attenuation of the stopband and small passband ripple level which shows the advantages of the proposed KBNN method
Idea and Theory of Particle Access
Aiming at some problems existing in the current quality of service (QoS)
mechanism of large-scale networks (i.e. poor scalability, coarse granularity
for provided service levels, poor fairness between different service levels,
and improving delay performance at the expense of sacrificing some resource
utilization), the paper puts forward the idea and thoery of particle access. In
the proposed particle access mechanism, the network first granulates the
information flow (that is, the information flow is subdivided into information
particles, each of which is given its corresponding attributes), and allocates
access resources to the information particle group which is composed of all the
information particles to be transmitted, so as to ensure that the occupied
bandwidth resources is minimized on the premise of meeting the delay
requirements of each information particle. Moreover, in the paper, the concepts
of both information particle and information particle group are defined; Basic
properties of the minimum reachable access bandwidth of an information particle
group are analyzed; The influences of time attribute and attribute of bearing
capacity of an information particle group on the minimum reachable access
bandwidth are analyzed; Finally, an effective method for the calculation of the
minimum reachable access bandwidth of an information particle group is given,
and a particle access algorithm based on dynamically adjusting the minimum
reachable access bandwidth is proposed. The research of the paper pave a new
way for further improving QoS mechanisms of large-scale networks, and lay the
corresponding theoretical foundation
Instruct-NeuralTalker: Editing Audio-Driven Talking Radiance Fields with Instructions
Recent neural talking radiance field methods have shown great success in
photorealistic audio-driven talking face synthesis. In this paper, we propose a
novel interactive framework that utilizes human instructions to edit such
implicit neural representations to achieve real-time personalized talking face
generation. Given a short speech video, we first build an efficient talking
radiance field, and then apply the latest conditional diffusion model for image
editing based on the given instructions and guiding implicit representation
optimization towards the editing target. To ensure audio-lip synchronization
during the editing process, we propose an iterative dataset updating strategy
and utilize a lip-edge loss to constrain changes in the lip region. We also
introduce a lightweight refinement network for complementing image details and
achieving controllable detail generation in the final rendered image. Our
method also enables real-time rendering at up to 30FPS on consumer hardware.
Multiple metrics and user verification show that our approach provides a
significant improvement in rendering quality compared to state-of-the-art
methods.Comment: 11 pages, 8 figure
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