3 research outputs found
Joint Depth Estimation and Mixture of Rain Removal From a Single Image
Rainy weather significantly deteriorates the visibility of scene objects,
particularly when images are captured through outdoor camera lenses or
windshields. Through careful observation of numerous rainy photos, we have
found that the images are generally affected by various rainwater artifacts
such as raindrops, rain streaks, and rainy haze, which impact the image quality
from both near and far distances, resulting in a complex and intertwined
process of image degradation. However, current deraining techniques are limited
in their ability to address only one or two types of rainwater, which poses a
challenge in removing the mixture of rain (MOR). In this study, we propose an
effective image deraining paradigm for Mixture of rain REmoval, called
DEMore-Net, which takes full account of the MOR effect. Going beyond the
existing deraining wisdom, DEMore-Net is a joint learning paradigm that
integrates depth estimation and MOR removal tasks to achieve superior rain
removal. The depth information can offer additional meaningful guidance
information based on distance, thus better helping DEMore-Net remove different
types of rainwater. Moreover, this study explores normalization approaches in
image deraining tasks and introduces a new Hybrid Normalization Block (HNB) to
enhance the deraining performance of DEMore-Net. Extensive experiments
conducted on synthetic datasets and real-world MOR photos fully validate the
superiority of the proposed DEMore-Net. Code is available at
https://github.com/yz-wang/DEMore-Net.Comment: 11 pages, 7 figures, 5 table
Two-Dimensional Lattice Boltzmann Model For Compressible Flows With High Mach Number
In this paper we present an improved lattice Boltzmann model for compressible
Navier-Stokes system with high Mach number. The model is composed of three
components: (i) the discrete-velocity-model by Watari and Tsutahara [Phys Rev E
\textbf{67},036306(2003)], (ii) a modified Lax-Wendroff finite difference
scheme where reasonable dissipation and dispersion are naturally included,
(iii) artificial viscosity. The improved model is convenient to compromise the
high accuracy and stability. The included dispersion term can effectively
reduce the numerical oscillation at discontinuity. The added artificial
viscosity helps the scheme to satisfy the von Neumann stability condition.
Shock tubes and shock reflections are used to validate the new scheme. In our
numerical tests the Mach numbers are successfully increased up to 20 or higher.
The flexibility of the new model makes it suitable for tracking shock waves
with high accuracy and for investigating nonlinear nonequilibrium complex
systems