We hereby proposed and experimentally demonstrated an active polarization imaging technique, based on wavelength selection, for seeing through highly turbid water where targets are always visually lost. The method was realized by making use of the dependence light scattering in water. Red illumination selected to minimize occurring propagation guarantee accurate estimation degree polarization. Experiments demonstrate its contribution turn from "undetectable" "detectable."

Underwater imaging provides human vision system friendly images; however, it often suffers from severe image degradation. This research developed an underwater polarization model, which considers the water scattering effect, as well absorption effect. It fully explored information of target scene that backscattered light is partially polarized and unpolarized. Then first estimated removed. The scene's distance derived based upon information, then applied to develop a distance-based...

A procedure for the detection and removal of haze from dense hazy images has been proposed. It involves analysis on content low-spatial-frequency information a scene. The image contaminated by is decomposed into different spatial frequency layers wavelet transform, which parts are focused low-frequency components. dehazing method combining both airlight direct transmission employed to specially dehaze parts. high-frequency processed transfer function enhance clarity image. Finally, dehazed...

Underwater imaging method based on polarization information is extremely popular due to its ability effectively remove the backscattered light. The Stokes vector contains of both degree and angle light wave. However, this aspect has been rarely utilized in image reconstruction. In study, an underwater polarimetric model established by fully exploiting feature vectors. transmission wave described terms derived from vector. Then, optimization function designed independent characteristics...

Underwater imaging is a promising but challenging topic due to the scattering particles in water, which result serious light attenuation. Therefore, underwater images suffer from low-contrast and low-resolution issues. In this study, order recover high-quality images, point spread functions (PSFs) are estimated by slant-edge method. The experiment modulates illumination source deal with backscattering imager take two orthogonally polarized states. This method benefits satisfactory edge...

This paper presents a near-infrared (NIR) monocular 3D computational polarization imaging method to directly reconstruct the shape of surfaces exhibiting nonuniform reflectance. A reference gradient field is introduced weight constraints for globally correcting ambiguity surface normal target with We experimentally demonstrated that our can reflectance in not only near but also far field. Moreover, proposed method, axial resolution be kept constant even under different object distances as...

The nonuniform of polarization information backscattered light has always been a neglected characteristic in underwater imaging, but its accurate estimation plays an important role the quality imaging results. Traditional methods assume that degree and angle are constant. In fact, backscattering is gradual, this assumption makes traditional work only small area camera's field view, which change can be ignored. paper, by analyzing distribution light, it concluded characteristics low-rank....

Using the Debye model and existing experimental data of pyroelectric coefficient AlN, temperature dependence as well spontaneous polarization AlN is calculated over a wide range from 0to1000K. The proportional to T3 at low increases acutely 0 around 400K, then gently 400to1000K. It makes uniquely suitable for application in high sensors. changes little 0to1000K, which indicates that features III-nitrides based devices will hardly be degraded by change polarization.

Polarization underwater imaging is of great potential to target detection in turbid water. Typical methods are challenged by the requirement on degrees polarization (DoPs) both light and backscattering. A descattering method was developed using Mueller matrix, which turn derived a depolarization (Dep) index from matrix characterize scattering media estimating transmittance map combining optimal function. By quantifying attenuation with map, clear vision targets can be recovered. Only...

This paper presents a polarization descattering imaging method for underwater detection in which the targets have nonuniform characteristics. The core of this takes distribution information target-reflected light into account and expands application field imaging. Independent component analysis was used to separate target backscattered light. Theoretical proof-of-concept experiments were employed demonstrate effectiveness proposed estimating information. showed superiority accurately...

A concise band selection method employing multispectral signatures of stealth aircraft whose infrared radiation was remarkably reduced proposed for precise target detection. The key step to select two or more optimal bands which could clearly signify the difference between and its background. principle preliminary based on differences characteristics main constituents aircraft's plume gas, i.e., CO2 H2O. Two narrow 2.86 3.3 4.17 4.55 μm were finally selected after detailed analyses contrast...

Accurate passive 3D face reconstruction is of great importance with various potential applications. Three-dimensional polarization a promising approach, but one bothered by serious deformations caused an ambiguous surface normal. In this study, we propose learning-based method for reconstruction. It first calculates the normal each microfacet at pixel level based on diffusely reflected light face, where no auxiliary equipment, including artificial illumination, required. Then, CNN-based 3DMM...

Research on polarization characteristics of objects has become indispensable in the field target detection. Though widespread studies applying to detection and material identification exist, theoretical descriptions have varied widely accuracy completeness. Incomplete invariably result poor demonstration changes caused by macroscopic influence factors. For that are finite surface, a comprehensive model is built analyze their thermal emission. With Stokes theory superposition principle light...

A conduction-cooled HTS hybrid magnet is developed for a 150-kJ/100-kW SMES system used power conditioning. As main component of dynamic operation system, it necessary to evaluate the current carrying ability, temperature characteristic, and thermal stability magnet. In this paper, structure introduced. Then, series experiments were conducted investigate voltage variations every coil when fed with different transport at 77 20 K. The variation K are observed. addition, ability presented,...

An ingenious and compact snapshot multispectral polarization imaging method is proposed based on a new, to the best of our knowledge, three-channel-switchable spectral coded aperture. We utilize aperture simultaneously select three-channel light components encode them with specific spectrum-polarization coefficients. It enables easy retrieval each channel's component from mixed information via measurements linear decoding operations. Distinct can be detected simultaneously, thus achieving...

Group III nitrides, especially gallium nitride (GaN), have many applications. The materials are usually grown by metal organic chemical vapor deposition (MOCVD) technology. By combining the computational fluid dynamics and kinetic Monte Carlo method, we present a multiscale modeling of dynamics, thermodynamics, molecular to study physical growth process GaN in standard MOCVD reactor, which shows general agreement with experimental results. theoretical model thus provides us fundamental...

We present the design of a circular polarization imager for imaging in rainy conditions, which is free from image calibration and correction before obtaining orthogonal-state contrast image. The system employed quarter wave plate front two Wollaston Prisms (WPs) to capture circularly polarized information acquire orthogonally images simultaneously on charge coupled device (CCD). Along with WPs, reimaging part multiaperture structure composed separate specialized modules, were implemented...

Determining the spontaneous polarization is a fundamental problem in III-nitride field. However experimental value of has not yet been reported. In this study, thermodynamic model proposed to investigate GaN from high-pressure phase transition. Total macroscopic directly expressed as coefficients expansion, and these are found be conducted experiments. The estimated around −0.022 C/m2.