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Journal articles on the topic 'Spectral polarization images'

Author: Grafiati

Published: 3 June 2025

Last updated: 1 August 2025

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1

Popović, L. Č., V. L. Afanasiev, E. S. Shablovinskaya, V. I. Ardilanov, and Dj Savić. "Spectroscopy and polarimetry of the gravitationally lensed quasar Q0957+561." Astronomy & Astrophysics 647 (March 2021): A98. http://dx.doi.org/10.1051/0004-6361/202039914.

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Context. We present new spectroscopic and polarimetric observations of the first discovered gravitational lens, Q0957+561. The lensed quasar has been observed with the 6 m telescope of the Special Astrophysical Observatory (Russia) in polarimetric and spectroscopic modes. Aims. We explore the spectropolarimetric parameters of the A and B components of Q0957+561 to investigate the innermost structure of gravitationally lensed quasars and explore the nature of polarization in lensed quasars. Additionally, we aim to compare their present-day spectral characteristics with previous observations in

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Zhang, Y., L. Y. Luo, H. J. Zhao, R. D. Qiu, and Y. S. Ying. "IMAGE DEHAZING BASED ON MULTISPECTRAL POLARIZATION IMAGING METHOD IN DIFFERENT DETECTION MODES." ISPRS - International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences XLIII-B1-2020 (August 6, 2020): 615–20. http://dx.doi.org/10.5194/isprs-archives-xliii-b1-2020-615-2020.

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Abstract. In haze, the quality of the images is degraded due to the scattering of atmospheric aerosol particles in near-earth remote sensing. Therefore, how to effectively remove the influence of haze and improve image quality has been a hot issue. A polarization spectral image dehazing method is proposed here. A multi-spectral full-polarization imager was used to detect the polarization spectral images of ground objects. Firstly, the maximum- and minimum-intensity polarization images were obtained from the relationship between the Stokes vector and the Mueller matrix. Secondly, the airlight p

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Zhang, Wenxiu, Yuchen Lin, Cong Zhao, Qun Zhou, Wei Fang, and Xin Ye. "Multispectral Earth Polarization Observation Based on the Lagrange L1 Point of the Earth–Moon System." Applied Sciences 15, no. 6 (2025): 3268. https://doi.org/10.3390/app15063268.

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We propose a Multispectral Earth Polarization Imager (MEPI), which is located at the Earth–Moon system’s Lagrange point L1. The imager can be used to measure the sunlight reflected by the Earth and the Moon. The measured sunlight has specific polarization information and spectral information, which can provide strong support for a comprehensive understanding of the Earth system and the construction of a perfect Earth–Moon system model. The MEPI provides multispectral images with wavelengths of 400–885 nm, and uses four sub-aperture systems to share a main system. The imager can capture the two

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Jorge, Luis Bacca-Quintero, Miguel Vargas-García Héctor, Ricardo Molina-Velasco Daniel, and Arguello-Fuentes Henry. "Single Pixel Compressive Spectral Polarization Imaging using a Movable Micro-Polarizer Array." Revista Facultad de Ingeniería -redin-, no. 88 (September 18, 2018): 91–99. https://doi.org/10.17533/udea.redin.n88a10.

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The acquisition of spectral polarization images is a method that obtains polarized, spectral and spatial information of a scene. Traditional acquisition methods use dynamic elements that capture all the information of a scene, by scanning the areas of interest, which result in large amounts of data proportional to the desired image resolution. Hence, in this work, the compression of spectral polarization images using a single pixel architecture, that uses a micro-polarizer array aligned with a binary coded aperture is proposed. The micro-polarizer is moved horizontally in each shot, so that di

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Machikhin, A. S., and V. E. Pozhar. "Obtaining spectral stereo images with electronic spectral tuning and polarization separation." Technical Physics Letters 40, no. 9 (2014): 803–6. http://dx.doi.org/10.1134/s1063785014090247.

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Liu, Jianan, Jing Cui, Mingce Chen, et al. "Design of Polarization Spectroscopy Integrated Imaging System." Photonics 11, no. 12 (2024): 1183. https://doi.org/10.3390/photonics11121183.

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To simultaneously acquire the spectral and polarization information of the target and achieve the monitoring and identification of the target object, a polarization spectral integrated imaging system is proposed in this paper. Firstly, the structural principle of the polarization spectral integrated imaging system is introduced. The relationship between the spatial resolution, spectral resolution, and the system’s structural parameters is analyzed. The design of the optical part of the polarization spectral integrated imaging system is completed, along with the tolerance analysis. Secondly, th

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Han, J. L., X. Y. Gao, X. H. Sun та ін. "Radio polarization observations of large supernova remnants at λ6 cm". Proceedings of the International Astronomical Union 9, S296 (2013): 202–9. http://dx.doi.org/10.1017/s1743921313009472.

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AbstractWe have observed 79 supernova remnants (SNRs) with the Urumqi 25 m telescope at λ6 cm during the Sino-German λ6 cm polarization survey of the Galactic plane. We measured flux densities of SNRs at λ6 cm, some of which are the first ever measured or the measurements at the highest frequency, so that we can determine or improve spectra of SNRs. Our observations have ruled out spectral breaks or spectral flattening that were suggested for a few SNRs, and confirmed the spectral break of S147. By combining our λ6 cm maps with λ11 cm and λ21 cm maps from the Effelsberg 100 m telescope, we cal

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Wang, Chang, Xinyu Liu, Yang Zhang, Yan Sun, Zeqing Yu, and Zhenrong Zheng. "Dual-Channel Switchable Metasurface Filters for Compact Spectral Imaging with Deep Compressive Reconstruction." Nanomaterials 13, no. 21 (2023): 2854. http://dx.doi.org/10.3390/nano13212854.

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Spectral imaging technology, which aims to capture images across multiple spectral channels and create a spectral data cube, has been widely utilized in various fields. However, conventional spectral imaging systems face challenges, such as slow acquisition speed and large size. The rapid development of optical metasurfaces, capable of manipulating light fields versatilely and miniaturizing optical components into ultrathin planar devices, offers a promising solution for compact hyperspectral imaging (HSI). This study proposes a compact snapshot compressive spectral imaging (SCSI) system by le

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Guo, Fengqi, Jingping Zhu, Liqing Huang, et al. "Enhancing Spatial Debris Material Classifying through a Hierarchical Clustering-Fuzzy C-Means Integration Approach." Applied Sciences 13, no. 8 (2023): 4754. http://dx.doi.org/10.3390/app13084754.

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This paper presents a novel approach for clustering spectral polarization data acquired from space debris using a fuzzy C-means (FCM) algorithm model based on hierarchical agglomerative clustering (HAC). The effectiveness of the proposed algorithm is verified using the Kosko subset measure formula. By extracting characteristic parameters representing spectral polarization from laboratory test data of space debris samples, a characteristic matrix for clustering is determined. The clustering algorithm’s parameters are determined through a random selection of points in the external field. The res

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Park, No-Wook, Min-Gyu Park, Geun-Ho Kwak, and Sungwook Hong. "Deep Learning-Based Virtual Optical Image Generation and Its Application to Early Crop Mapping." Applied Sciences 13, no. 3 (2023): 1766. http://dx.doi.org/10.3390/app13031766.

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This paper investigates the potential of cloud-free virtual optical imagery generated using synthetic-aperture radar (SAR) images and conditional generative adversarial networks (CGANs) for early crop mapping, which requires cloud-free optical imagery at the optimal date for classification. A two-stage CGAN approach, including representation and generation stages, is presented to generate virtual Sentinel-2 spectral bands using all available information from Sentinel-1 SAR and Sentinel-2 optical images. The dual-polarization-based radar vegetation index and all available multi-spectral bands o

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Chen, Lixin, Shiyuan Zhang, Wenbin Zheng, and Lishuang Yao. "High Light Efficiency Spectral Polarization Imaging Method Based on Mach–Zehnder Structured Liquid Crystal Tunable Filters and Variable Retarders." Photonics 10, no. 7 (2023): 765. http://dx.doi.org/10.3390/photonics10070765.

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Liquid crystal tunable filters (LCTFs) are extensively used in hyperspectral imaging systems to obtain spectral information of target scenes. However, a typical LCTF can only filter linearly polarized light, greatly reducing the transmittance of the system and limiting its application in spectral and polarization imaging. In this paper, a spectropolarimeter using Mach–Zehnder structured LCTFs (MZ-LCTFs) combined with liquid crystal variable retarders (LCVRs) is proposed. The polarized beam splitter (PBS) can make full use of the two polarization components of the incident light to improve the

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Mihoubi, Sofiane, Pierre-Jean Lapray, and Laurent Bigué. "Survey of Demosaicking Methods for Polarization Filter Array Images." Sensors 18, no. 11 (2018): 3688. http://dx.doi.org/10.3390/s18113688.

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Snapshot polarization imaging has gained interest in the last few decades. Recent research and technology achievements defined the polarization Filter Array (PFA). It is dedicated to division-of-focal plane polarimeters, which permits to analyze the direction of light electric field oscillation. Its filters form a mosaicked pattern, in which each pixel only senses a fraction of the total polarization states, so the other missing polarization states have to be interpolated. As for Color or Spectral Filter Arrays (CFA or SFA), several dedicated demosaicking methods exist in the PFA literature. S

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Marhaba, Salem, and Samaya El Samad. "Plasmonic Coupling of One-Dimensional Palladium Nanoparticle Chains." Nano 15, no. 05 (2020): 2050060. http://dx.doi.org/10.1142/s1793292020500605.

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In this paper, we investigate the plasmonic coupling effects on the localized surface plasmon resonances (LSPRs) of palladium nanoparticle chains. We show the transmission electron microscopy (TEM) images and the extinction cross-section spectra of near-contact palladium nanoparticle chains from monomer to pentamer. The extinction spectra of chains nanoparticles were measured by far-field polarization spectroscopy over a large spectral range (ultraviolet, visible and near-infrared) and compared with numerical calculations based on finite element method (FEM). For single palladium nanoparticle,

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14

Zhang, Qian, Xiangnan Liu, Meiling Liu, Xinyu Zou, Lihong Zhu, and Xiaohao Ruan. "Comparative Analysis of Edge Information and Polarization on SAR-to-Optical Translation Based on Conditional Generative Adversarial Networks." Remote Sensing 13, no. 1 (2021): 128. http://dx.doi.org/10.3390/rs13010128.

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To accurately describe dynamic vegetation changes, high temporal and spectral resolution data are urgently required. Optical images contain rich spectral information but are limited by poor weather conditions and cloud contamination. Conversely, synthetic-aperture radar (SAR) is effective under all weather conditions but contains insufficient spectral information to recognize certain vegetation changes. Conditional adversarial networks (cGANs) can be adopted to transform SAR images (Sentinel-1) into optical images (Landsat8), which exploits the advantages of both optical and SAR images. As the

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Wang, Jiayu, Haodong Shi, Jianan Liu, et al. "The Analysis and Experiment of Pixel-Matching Method for Space-Dimensional Dual-Coded Spectropolarimeter." Photonics 10, no. 6 (2023): 632. http://dx.doi.org/10.3390/photonics10060632.

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In order to meet the high accuracy pixel-matching requirements of space-dimensional dual-coded spectropolarimeter, a dual-coded image pixel-matching method based on dispersion modulation is proposed. The mathematics of the dispersion power and the pixel matching is modeled. The relationship between different pixel-matching coefficients and the peak signal-to-noise ratio (PSNR) and structure similarity index measure (SSIM) of reconstructed images is analyzed. An imaging system experiment consisting of a digital micromirror device (DMD), a micro-polarizer array detector (MPA), and a prism–gratin

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ZHANG Ying, 张颖, 王兴 WANG Xing, 张思维 ZHANG Siwei та ін. "基于偏振光谱图像的融合去雾方法（特邀）". Infrared and Laser Engineering 54, № 5 (2025): 20240523. https://doi.org/10.3788/irla20240523.

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Guo, Fengqi, Jingping Zhu, Liqing Huang, et al. "Multi-Dimensional Fusion of Spectral and Polarimetric Images Followed by Pseudo-Color Algorithm Integration and Mapping in HSI Space." Remote Sensing 16, no. 7 (2024): 1119. http://dx.doi.org/10.3390/rs16071119.

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Spectral–polarization imaging technology plays a crucial role in remote sensing detection, enhancing target identification and tracking capabilities by capturing both spectral and polarization information reflected from object surfaces. However, the acquisition of multi-dimensional data often leads to extensive datasets that necessitate comprehensive analysis, thereby impeding the convenience and efficiency of remote sensing detection. To address this challenge, we propose a fusion algorithm based on spectral–polarization characteristics, incorporating principal component analysis (PCA) and en

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Chen, Zhang, Mu, Yan, Chen, and Wang. "An Efficient Representation-Based Subspace Clustering Framework for Polarized Hyperspectral Images." Remote Sensing 11, no. 13 (2019): 1513. http://dx.doi.org/10.3390/rs11131513.

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Recently, representation-based subspace clustering algorithms for hyperspectral images (HSIs) have been developed with the assumption that pixels belonging to the same land-cover class lie in the same subspace. Polarization is regarded to be a complement to spectral information, but related research only focus on the clustering for HSIs without considering polarization, and cannot effectively process large-scale hyperspectral datasets. In this paper, we propose an efficient representation-based subspace clustering framework for polarized hyperspectral images (PHSIs). Combining with spectral in

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19

Levenson, Richard. "Spectral Imaging: Fluorescence and Brightfield." Microscopy and Microanalysis 7, S2 (2001): 20–21. http://dx.doi.org/10.1017/s1431927600026179.

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Spectral imaging is a relatively new technique that provides images of a scene at multiple wavelengths and can generate precise optical spectra at every pixel. Mathematical approaches may then be used to extract the maximum information from the spectral image. Spectral imaging is routinely used in “remote sensing”, that is, the analysis of distant landscapes and structures from airplanes or satellites. Minor differences in spectra can be used to detect different crops, or mineral deposits, for example. Closer in, spectral imaging has uses in industrial process control, detection of otherwise i

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Moharrami, Meysam, Sara Attarchi, Richard Gloaguen, and Seyed Kazem Alavipanah. "Integration of Sentinel-1 and Sentinel-2 Data for Ground Truth Sample Migration for Multi-Temporal Land Cover Mapping." Remote Sensing 16, no. 9 (2024): 1566. http://dx.doi.org/10.3390/rs16091566.

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Reliable and up-to-date training reference samples are imperative for land cover (LC) classification. However, such training datasets are not always available in practice. The sample migration method has shown remarkable success in addressing this challenge in recent years. This work investigated the application of Sentinel-1 (S1) and Sentinel-2 (S2) data in training sample migration. In addition, the impact of various spectral bands and polarizations on the accuracy of the migrated training samples was also assessed. Subsequently, combined S1 and S2 images were classified using the Support Ve

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Xu, Kuangyi, Zachery B. Harris, Paul Vahey, and M. Hassan Arbab. "THz Polarimetric Imaging of Carbon Fiber-Reinforced Composites Using the Portable Handled Spectral Reflection (PHASR) Scanner." Sensors 24, no. 23 (2024): 7467. http://dx.doi.org/10.3390/s24237467.

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Recent advancements in novel fiber-coupled and portable terahertz (THz) spectroscopic imaging technology have accelerated applications in nondestructive testing (NDT). Although the polarization information of THz waves can play a critical role in material characterization, there are few demonstrations of polarization-resolved THz imaging as an NDT modality due to the deficiency of such polarimetric imaging devices. In this paper, we have inspected industrial carbon fiber composites using a portable and handheld imaging scanner in which the THz polarizations of two orthogonal channels are simul

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Voloshinov, V. B., V. Ya Molchanov, and J. C. Mosquera. "Spectral and polarization analysis of optical images by means of acousto-optics." Optics & Laser Technology 28, no. 2 (1996): 119–27. http://dx.doi.org/10.1016/0030-3992(95)00079-8.

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Emami, Razieh, Richard Anantua, Andrew A. Chael, and Abraham Loeb. "Positron Effects on Polarized Images and Spectra from Jet and Accretion Flow Models of M87* and Sgr A*." Astrophysical Journal 923, no. 2 (2021): 272. http://dx.doi.org/10.3847/1538-4357/ac2950.

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Abstract We study the effects of including a nonzero positron-to-electron fraction in emitting plasma on the polarized spectral energy distributions and submillimeter images of jet and accretion flow models for near-horizon emission from M87* and Sgr A*. For M87*, we consider a semi-analytic fit to the force-free plasma regions of a general relativistic magnetohydrodynamic jet simulation, which we populate with power-law leptons with a constant electron-to-magnetic pressure ratio. For Sgr A*, we consider a standard self-similar radiatively inefficient accretion flow where the emission is predo

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Yuan, Y., Z. Liu, X. Zheng, et al. "POLARIMETRIC CALIBRATION OF THE SPACEBORNE DIRECTIONAL POLARIMETRIC CAMERA INSTALLED ON THE GF-5 SATELLITE." ISPRS - International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences XLIII-B1-2020 (August 6, 2020): 599–606. http://dx.doi.org/10.5194/isprs-archives-xliii-b1-2020-599-2020.

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Abstract. The Spaceborne Directional Polarimetric Camera (SDPC) is dedicated to obtain an accurate information of clouds and microphysical properties of aerosol particles via multi-angle, multi-spectral and multi-polarization observations. It images the Earth with 110° field of view (FOV) in 3 polarimetric spectral bands and 5 non-polarimetric spectral bands from visible to near infrared. Due to its wide FOV telecentric optical system and multi-channels, polarization sensitivity of optical components (PSOC) and non-uniform response of pixels (NURP) are the main uncertainty factors of polarimet

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Batshev, VI, A. V. Gorevoy, V. E. Pozhar, and A. S. Machikhin. "Aberration analysis of AOTF-based stereoscopic spectral imager using optical design software." Journal of Physics: Conference Series 2127, no. 1 (2021): 012035. http://dx.doi.org/10.1088/1742-6596/2127/1/012035.

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Abstract Stereoscopic spectral imagers using acousto-optic tunable filters (AOTF) provide high-resolution narrow band images acquired from two viewpoints with different polarization in arbitrary spectral intervals, which allows obtaining three-dimensional hyperspectral models of inspected objects for many applications. We discuss modeling of acousto-optic (AO) cell for optical system design and introduce a program module for ray tracing through AO cell compatible with Zemax optical design software. A detailed study of the optical aberrations that limit the image quality in two AOTF-based stere

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Wang, Hongpeng, Xinru Yan, Yingjian Xin, et al. "Characterization of Stromatolite Organic Sedimentary Structure Based on Spectral Image Fusion." Sensors 23, no. 13 (2023): 6128. http://dx.doi.org/10.3390/s23136128.

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This paper evaluates the potential application of Raman baselines in characterizing organic deposition. Taking the layered sediments (Stromatolite) formed by the growth of early life on the Earth as the research object, Raman spectroscopy is an essential means to detect deep-space extraterrestrial life. Fluorescence is the main factor that interferes with Raman spectroscopy detection, which will cause the enhancement of the Raman baseline and annihilate Raman information. The paper aims to evaluate fluorescence contained in the Raman baseline and characterize organic sedimentary structure usin

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Beechem, Thomas E., Sean W. Smith, R. Guild Copeland, Fangze Liu, and Taisuke Ohta. "Spectral and polarization based imaging in deep-ultraviolet excited photoelectron microscopy." Review of Scientific Instruments 93, no. 5 (2022): 053701. http://dx.doi.org/10.1063/5.0077867.

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Using photoelectron emission microscopy, nanoscale spectral imaging of atomically thin MoS2 buried between Al2O3 and SiO2 is achieved by monitoring the wavelength and polarization dependence of the photoelectron signal excited by deep-ultraviolet light. Although photons induce the photoemission, images can exhibit resolutions below the photon wavelength as electrons sense the response. To validate this concept, the dependence of photoemission yield on the wavelength and polarization of the exciting light was first measured and then compared to simulations of the optical response quantified wit

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Shen, Ying, Xiancai Liu, Shuo Zhang, et al. "Real-Time Segmentation of Artificial Targets Using a Dual-Modal Efficient Attention Fusion Network." Remote Sensing 15, no. 18 (2023): 4398. http://dx.doi.org/10.3390/rs15184398.

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The fusion of spectral–polarimetric information can improve the autonomous reconnaissance capability of unmanned aerial vehicles (UAVs) in detecting artificial targets. However, the current spectral and polarization imaging systems typically suffer from low image sampling resolution, which can lead to the loss of target information. Most existing segmentation algorithms neglect the similarities and differences between multimodal features, resulting in reduced accuracy and robustness of the algorithms. To address these challenges, a real-time spectral–polarimetric segmentation algorithm for art

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Ricarte, Angelo, Michael D. Johnson, Yuri Y. Kovalev, Daniel C. M. Palumbo, and Razieh Emami. "How Spatially Resolved Polarimetry Informs Black Hole Accretion Flow Models." Galaxies 11, no. 1 (2022): 5. http://dx.doi.org/10.3390/galaxies11010005.

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The Event Horizon Telescope (EHT) Collaboration has successfully produced images of two supermassive black holes, enabling novel tests of black holes and their accretion flows on horizon scales. The EHT has so far published total intensity and linear polarization images, while upcoming images may include circular polarization, rotation measure, and spectral index, each of which reveals different aspects of the plasma and space-time. The next-generation EHT (ngEHT) will greatly enhance these studies through wider recorded bandwidths and additional stations, leading to greater signal-to-noise, o

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Yao, Hang, Bolin Fu, Ya Zhang, et al. "Combination of Hyperspectral and Quad-Polarization SAR Images to Classify Marsh Vegetation Using Stacking Ensemble Learning Algorithm." Remote Sensing 14, no. 21 (2022): 5478. http://dx.doi.org/10.3390/rs14215478.

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Combinations of multi-sensor remote sensing images and machine learning have attracted much attention in recent years due to the spectral similarity of wetland plant canopy. However, the integration of hyperspectral and quad-polarization synthetic aperture radar (SAR) images for classifying marsh vegetation has still been faced with the challenges of using machine learning algorithms. To resolve this issue, this study proposed an approach to classifying marsh vegetation in the Honghe National Nature Reserve, northeast China, by combining backscattering coefficient and polarimetric decompositio

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Iñiguez-Garín, E., D. Hiriart, J. Ramirez-Velez, J. M. Núñez-Alfonso, J. Herrera, and J. Castro-Chacón. "A new spectropolarimeter for the San Pedro Martir National Observatory." Proceedings of the International Astronomical Union 9, S302 (2013): 154–55. http://dx.doi.org/10.1017/s1743921314001951.

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AbstractWe present the design of a stellar spectropolarimeter to measure the magnetic field of point sources. The polarization module interfaces the Boller and Chivens (B&Ch) intermediate-low resolution (R ~ 500 − 4000) spectrograph to the 2.1-m telescope of the San Pedro Martir National Astronomical Observatory in Mexico. The module uses a Savart plate to split the beam into two orthogonal states of polarization and a quarter (half) waveplate to measure circular (linear) polarization. The module is mounted to the telescope and it feeds the spectrograph through a set of four fibers, two fo

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Zhang, Yue, Qiang Fu, Kaiming Luo, et al. "Analysis of Two-Color Infrared Polarization Imaging Characteristics for Target Detection and Recognition." Photonics 10, no. 11 (2023): 1181. http://dx.doi.org/10.3390/photonics10111181.

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Infrared polarization imaging has demonstrated significant advantages in target detection and recognition in natural environments. While there have been numerous research achievements on medium-wave/long-wave infrared polarization in a single band, there is a lack of related conclusions on the characteristics of wide spectral two-color infrared polarization imaging. To address this gap, this article employs a theoretical model in infrared polarization imaging to investigate the influence of temperature, incident angle, and refractive index on polarization degree and polarization angle. These f

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Clayton, Andrew H. A. "Spectral Relaxation Imaging Microscopy II: Complex Dynamics." International Journal of Molecular Sciences 24, no. 15 (2023): 12271. http://dx.doi.org/10.3390/ijms241512271.

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The dynamics of condensed matter can be measured by the time-dependent Stokes shift of a suitable fluorescent probe. The time-dependent spectral correlation function is typically described by one or more spectral relaxation correlation times, which, in liquid solvents, characterize the timescales of the dipolar relaxation processes around the excited-state probe. The phasor plot provides a powerful approach to represent and analyze time and frequency-domain data acquired as images, thus providing a spatial map of spectral dynamics in a complex structure such as a living cell. Measurements of t

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Grevcev A. S., Zolotukhin P. A., Il’ichev E. A., Petrukhin G. N., Popov A. V., and Rychkov G. S. "An investigation of reading thermal images processes by a thermal image receiver made in the image intensifier tube architecture." Technical Physics 92, no. 5 (2022): 545. http://dx.doi.org/10.21883/tp.2022.05.53669.338-21.

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The results of calculations of electric fields, potentials, and trajectories of photoelectrons calculations of single-channel dual-spectral thermal imager, implemented in the IIT architecture are presented. The values of the optimal potentials on the control electrodes (microchannel plate, reading electrode, and photocathode) that form a picture of the images of objects and ensure the correct reading of the potential relief from the surface of the sensor-converter pyroelectric film of the image thermal receiver under discussion are determined. Keywords: image intensifier tube, spontaneous pola

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Himes, Morgan, and Preshanth Jagannathan. "Bias in Polarization CLEAN Imaging." Research Notes of the AAS 7, no. 7 (2023): 151. http://dx.doi.org/10.3847/2515-5172/ace89a.

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Abstract Various deconvolution algorithms, such as Hogbom CLEAN, have been developed to construct radio images of the sky. The algorithms used for synthesis imaging in CASA are sub-optimal for polarimetric imaging of sources with nonzero rotation measures. This method focuses on linear polarization in Stokes Q and U and the bias introduced in cleaning linearly polarized sources. We propose a hybrid method of cleaning based on QU fitting to reduce this bias. This method acquires a fit for a source's spectral index, polarization angle, Stokes I amplitude, polarized fraction, and rotation measure

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Nivoit, P., A. M. Chevrier, M. Lagarde, C. Renaudin, and N. Wiernsperger. "Noninvasive Orthogonal Polarization Spectral Imaging as Applied to Microvascular Studies in Mice." Experimental Diabesity Research 5, no. 3 (2004): 211–17. http://dx.doi.org/10.1080/15438600490486859.

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In vivo observations of the mouse microcirculation can hardly be performed due to technical difficulties, limiting the knowledge that could be obtained from gene manipulated mice models. The aim of the present study was to check the applicability of a novel optical system, the orthogonal polarization spectral technology, to study the mouse microcirculation. In anaesthetized mice, the spinotrapezius muscle microcirculation was observed in situ. The diameter of precapillary arterioles was measured before and after a pharmacological or hormonal stimulation. High-contrast images of the muscle micr

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Bauer, Andreas, Sieglinde Kofler, Manfred Thiel, Sandra Eifert, and Frank Christ. "Monitoring of the Sublingual Microcirculation in Cardiac Surgery Using Orthogonal Polarization Spectral Imaging." Anesthesiology 107, no. 6 (2007): 939–45. http://dx.doi.org/10.1097/01.anes.0000291442.69337.c9.

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Background The recent introduction of orthogonal polarization spectral imaging enables the direct visualization of the microcirculation of man without imaging enhancing dyes. The authors studied the changes in microvascular perfusion of sublingual mucosa during cardiac surgery with the use of cardiopulmonary bypass (CPB) using this optical method. Method Orthogonal polarization spectral images were recorded in 47 patients after skin incision (T1), after the start of CPB (T2), in the late phase of CPB (T3), and 1 h after the discontinuation of CPB (T4). The images were analyzed for microvascula

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Zhang, Jingjing, Kai Ge, Lina Xun, et al. "MFCD-Net: Cross Attention Based Multimodal Fusion Network for DPC Imagery Cloud Detection." Remote Sensing 14, no. 16 (2022): 3905. http://dx.doi.org/10.3390/rs14163905.

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As one kind of remote sensing image (RSI), Directional Polarimetric Camera (DPC) data are of great significance in atmospheric radiation transfer and climate feedback. The availability of DPC images is often hindered by clouds, and effective cloud detection is the premise of many applications. Conventional threshold-based cloud detection methods are limited in performance and generalization capability. In this paper, we propose an effective learning-based 3D multimodal fusion cloud detection network (MFCD-Net) model. The network is a three-input stream architecture with a 3D-Unet-like encoder-

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Tetschke, Florian, Jonas Golde, Julia Walther, et al. "Visualization of interfacial adhesive defects at dental restorations with spectral domain and polarization sensitive optical coherence tomography." Current Directions in Biomedical Engineering 4, no. 1 (2018): 559–62. http://dx.doi.org/10.1515/cdbme-2018-0134.

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AbstractRestoration loss based on interfacial adhesive defects and associated caries at the restoration margin are the main causes for invasive replacement of dental restorations. Assessment of the interfacial quality based on clinical inspection and radiographic examination is often difficult and not reliable. In this work, we present spectral domain optical coherence tomography (SDOCT) and polarization sensitive optical coherence tomography (PSOCT) for the evaluation of tooth-composite bond failure. Imaging of two composite restorations at the occlusal surface are presented using intensity-b

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Zabolotna, N. I., and V. V. Sholota. "Method and Decision Support Subsystem for Mueller-Matrix Laser Polarization Diagnosis of Biological Tissues." Optoelectronic Information-Power Technologies 43, no. 1 (2022): 43–52. http://dx.doi.org/10.31649/1681-7893-2022-43-1-43-52.

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A method and decision support subsystem based on the principles of fuzzy logic for Mueller-matrix polarization diagnostics of biological tissues have been developed. On the basis of statistical, correlation and spectral analysis of invariant Muller-matrix images of biological tissues and their superpositions, informative signs of diagnosis are determined. Mathematical models of functions belonging to the "normal" and "pathology" states of the studied samples for the decisive rule in the system have been developed.

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Heywood, Ian, Andrew P. V. Siemion, Daniel Czech, et al. "MeerKAT Observations of Procyon at 815.5 MHz." Research Notes of the AAS 8, no. 10 (2024): 255. http://dx.doi.org/10.3847/2515-5172/ad8439.

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Abstract We have conducted observations of the nearby (11.46 ly) star system Procyon, using MeerKAT’s UHF (544–1087 MHz) receivers. We produce full-Stokes time and frequency integrated continuum images, as well as total intensity time series imaging at 8 s cadence, and full-Stokes vector-averaged dynamic spectra from the visibilities in order to search for transient activity such as flaring events. We detect no significant radio emission from the system, and estimate an upper limit on the circular polarization fraction of 65% (3σ confidence level). A comparison with previous Very Large Array o

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Abbassi, Bahman, Li-Zhen Cheng, Michel Jébrak, and Daniel Lemire. "3D Geophysical Predictive Modeling by Spectral Feature Subset Selection in Mineral Exploration." Minerals 12, no. 10 (2022): 1296. http://dx.doi.org/10.3390/min12101296.

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Several technical challenges are related to data collection, inverse modeling, model fusion, and integrated interpretations in the exploration of geophysics. A fundamental problem in integrated geophysical interpretation is the proper geological understanding of multiple inverted physical property images. Tackling this problem requires high-dimensional techniques for extracting geological information from modeled physical property images. In this study, we developed a 3D statistical tool to extract geological features from inverted physical property models based on a synergy between independen

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Frail, Dale A., Emil Polisensky, Scott D. Hyman, et al. "An Image-based Search for Pulsar Candidates in the MeerKAT Bulge Survey." Astrophysical Journal 975, no. 1 (2024): 34. http://dx.doi.org/10.3847/1538-4357/ad74fd.

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Abstract We report on the results of an image-based search for pulsar candidates toward the Galactic bulge. We used mosaic images from the MeerKAT radio telescope that were taken as part of a 173 deg2 survey of the bulge and Galactic center of our Galaxy at L band (856–1712 MHz) in all four Stokes I, Q, U, and V. The image rms noise levels of 12–17 μJy ba−1 represent a significant increase in sensitivity over past image-based pulsar searches. Our primary search criterion was circular polarization, but we used other criteria, including linear polarization, in-band spectral index, compactness, v

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Shumigaĭ, Vladimir S., Polina E. Moreva, Boris A. Nasedkin, et al. "Ghost polarimetry with a spatial light modulator for creation of structured illumination patterns." Journal of Optical Technology 91, no. 5 (2024): 305. http://dx.doi.org/10.1364/jot.91.000305.

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Subject of study. The spatial distribution of polarization properties for objects with linear dichroism is studied. Aim of study. A ghost polarimetry system using a spatial light modulator to measure the optical fields illuminating an object with linear dichroism is developed. Method. Ghost polarimetry is used to measure the integral intensity of radiation passing through an object. The intensity correlation functions are numerically calculated for two orthogonally polarized sets of optical fields for subsequent calculation of the modulus of the anisotropy azimuth for an object with linear dic

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Takimoto, Kohji, Toshiaki Arai, Shuji Matsuura, et al. "Polarization Spectrum of Near-Infrared Zodiacal Light Observed with CIBER." Astrophysical Journal 926, no. 1 (2022): 6. http://dx.doi.org/10.3847/1538-4357/ac416f.

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Abstract We report the first measurement of the zodiacal light (ZL) polarization spectrum in the near-infrared between 0.8 and 1.8 μm. Using the low-resolution spectrometer on board the Cosmic Infrared Background Experiment, calibrated for absolute spectrophotometry and spectropolarimetry, we acquire long-slit polarization spectral images of the total diffuse sky brightness toward five fields. To extract the ZL spectrum, we subtract the contribution of other diffuse radiation, such as the diffuse galactic light, the integrated starlight, and the extragalactic background light. The measured ZL

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Eiroa, C., R. Lenzen, K. Leinert, and K. Hodapp. "Serpens-SVS 20: A new infrared double source." Symposium - International Astronomical Union 122 (1987): 115–16. http://dx.doi.org/10.1017/s0074180900156153.

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0.9 μm CCD images and 2.2 μm slit scan observations reveal the double character of the infrared source Serpens - SVS20; the separation, position angle and brightness ratio are 1.″6, 10°, and Δm ≍ 1.6 mag respectively. The southern source is the brightest at both spectral ranges. At 0.9 μm the observed polarization of each component is p = 9.0 %, ⊙ = 155° and p = 10.4 %, ⊙ = 135° for SVS20-South and SVS20-North respectively. These results combined with 2.2 μm polarimetry and JHKLM photometry suggest that both SVS20 sources are in fact low mass, probably PMS, stars.

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Attwa, M., and T. Günther. "Spectral induced polarization measurements for predicting the hydraulic conductivity in sandy aquifers." Hydrology and Earth System Sciences 17, no. 10 (2013): 4079–94. http://dx.doi.org/10.5194/hess-17-4079-2013.

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Abstract. Field and laboratory spectral induced polarization (SIP) measurements are integrated to characterize the hydrogeological conditions at the Schillerslage test site in Germany. The phase images are capable of monitoring thin peat layers within the sandy aquifers. However, the field results show limitations of decreasing resolution with depth. In comparison with the field inversion results, the SIP laboratory measurements show a certain shift in SIP response due to different compaction and sorting of the samples. The SIP data are analyzed to derive an empirical relationship for predicti

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Luken, Kieran J., Miroslav D. Filipović, Nigel I. Maxted, et al. "Radio observations of supernova remnant G1.9+0.3." Monthly Notices of the Royal Astronomical Society 492, no. 2 (2019): 2606–21. http://dx.doi.org/10.1093/mnras/stz3439.

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ABSTRACT We present 1–10 GHz radio continuum flux density, spectral index, polarization, and rotation measure (RM) images of the youngest known Galactic supernova remnant (SNR) G1.9+0.3, using observations from the Australia Telescope Compact Array. We have conducted an expansion study spanning eight epochs between 1984 and 2017, yielding results consistent with previous expansion studies of G1.9+0.3. We find a mean radio continuum expansion rate of (0.78 ± 0.09) per cent yr−1 (or ∼8900 km s−1 at an assumed distance of 8.5 kpc), although the expansion rate varies across the SNR perimetre. In t

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Mathura, Keshen R., Karlijn C. Vollebregt, Kees Boer, Jurgen C. De Graaff, Dirk T. Ubbink, and Can Ince. "Comparison of OPS imaging and conventional capillary microscopy to study the human microcirculation." Journal of Applied Physiology 91, no. 1 (2001): 74–78. http://dx.doi.org/10.1152/jappl.2001.91.1.74.

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Orthogonal polarization spectral (OPS) imaging is a new clinical technique for observation of the microcirculation of organ surfaces. For validation purposes, we compared OPS images of the nailfold skin with those obtained from conventional capillary microscopy at rest and during venous occlusion in 10 male volunteers. These images were computer analyzed to provide red blood cell velocity and capillary diameters of the same nailfold capillaries at rest and during venous occlusion. Results showed that OPS images provided similar values for red blood cell velocity and capillary diameter as those

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Chen, Zhijie, Yu Chen, Yuan Wang, Xiaoyan Wang, Xinsheng Wang, and Zhouru Xiang. "DCFF-Net: Deep Context Feature Fusion Network for High-Precision Classification of Hyperspectral Image." Remote Sensing 16, no. 16 (2024): 3002. http://dx.doi.org/10.3390/rs16163002.

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Hyperspectral images (HSI) contain abundant spectral information. Efficient extraction and utilization of this information for image classification remain prominent research topics. Previously, hyperspectral classification techniques primarily relied on statistical attributes and mathematical models of spectral data. Deep learning classification techniques have recently been extensively utilized for hyperspectral data classification, yielding promising outcomes. This study proposes a deep learning approach that uses polarization feature maps for classification. Initially, the polar co-ordinate

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