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Artículos de revistas sobre el tema "Spectral geometry processing"

Autor: Grafiati
Publicado: 11 de marzo de 2023
Última modificación: 19 de julio de 2025

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1

Vallet, B., and B. Lévy. "Spectral Geometry Processing with Manifold Harmonics." Computer Graphics Forum 27, no. 2 (2008): 251–60. http://dx.doi.org/10.1111/j.1467-8659.2008.01122.x.

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2

Fumero, Marco, Michael Möller, and Emanuele Rodolà. "Nonlinear spectral geometry processing via the TV transform." ACM Transactions on Graphics 39, no. 6 (2020): 1–16. http://dx.doi.org/10.1145/3414685.3417849.

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3

Clouet, Axel, Jérôme Vaillant, and David Alleysson. "The Geometry of Noise in Color and Spectral Image Sensors." Sensors 20, no. 16 (2020): 4487. http://dx.doi.org/10.3390/s20164487.

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Digital images are always affected by noise and the reduction of its impact is an active field of research. Noise due to random photon fall onto the sensor is unavoidable but could be amplified by the camera image processing such as in the color correction step. Color correction is expressed as the combination of a spectral estimation and a computation of color coordinates in a display color space. Then we use geometry to depict raw, spectral and color signals and noise. Geometry is calibrated on the physics of image acquisition and spectral characteristics of the sensor to study the impact of
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4

Kleinert, A., F. Friedl-Vallon, T. Guggenmoser, et al. "Level 0 to 1 processing of the imaging Fourier transform spectrometer GLORIA: generation of radiometrically and spectrally calibrated spectra." Atmospheric Measurement Techniques 7, no. 12 (2014): 4167–84. http://dx.doi.org/10.5194/amt-7-4167-2014.

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Abstract. The Gimballed Limb Observer for Radiance Imaging of the Atmosphere (GLORIA) is an imaging Fourier transform spectrometer that is capable of operating on various high-altitude research aircraft. It measures the atmospheric emission in the thermal infrared spectral region in limb and nadir geometry. GLORIA consists of a classical Michelson interferometer combined with an infrared camera. The infrared detector has a usable area of 128 × 128 pixels, measuring up to 16 384 interferograms simultaneously. Imaging Fourier transform spectrometers impose a number of challenges with respect to
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5

Kleinert, A., F. Friedl-Vallon, T. Guggenmoser, et al. "Level 0 to 1 processing of the imaging Fourier transform spectrometer GLORIA: generation of radiometrically and spectrally calibrated spectra." Atmospheric Measurement Techniques Discussions 7, no. 3 (2014): 2827–78. http://dx.doi.org/10.5194/amtd-7-2827-2014.

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Abstract. The Gimballed Limb Observer for Radiance Imaging of the Atmosphere (GLORIA) is an imaging Fourier transform spectrometer that is capable of operating on various high altitude research aircraft. It measures the atmospheric emission in the thermal infrared spectral region in limb and nadir geometry. GLORIA consists of a classical Michelson interferometer combined with an infrared camera. The infrared detector has a usable range of 128 × 128 pixels, measuring up to 16 384 interferograms simultaneously. Imaging Fourier transform spectrometers impose a number of challenges with respect to
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6

Patané, Giuseppe. "STAR - Laplacian Spectral Kernels and Distances for Geometry Processing and Shape Analysis." Computer Graphics Forum 35, no. 2 (2016): 599–624. http://dx.doi.org/10.1111/cgf.12866.

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7

Litvinovich, Hl S., and I. I. Bruchkouski. "Algorithm for preliminary processing of charge coupled devices array data based on the adaptive Wiener filter." Informatics 18, no. 1 (2021): 72–83. http://dx.doi.org/10.37661/1816-0301-2021-18-1-72-83.

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The researcher should choose the modes of recording spectra which allow to achieve the highest accuracy of spectral measurements in remote sensing systems. When registering a signal from aircraft which provide maximum coverage of the studied area, it is important to obtain a signal with the maximum signal-to- noise ratio in a minimum time, since the accumulation of spectra samples for averaging is impossible. The paper presents the experimental results of determining the noise components (readout noise, photon, electronic shot, pattern noise) for a monochrome uncooled CCD-line detector Toshiba
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8

Jiang, Yonghua, Jingyin Wang, Li Zhang, Guo Zhang, Xin Li, and Jiaqi Wu. "Geometric Processing and Accuracy Verification of Zhuhai-1 Hyperspectral Satellites." Remote Sensing 11, no. 9 (2019): 996. http://dx.doi.org/10.3390/rs11090996.

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The second batch of Zhuhai-1 microsatellites was successfully launched on 26 April 2018. The batch included four Orbita hyperspectral satellites (referred to as OHS-A, OHS-B, OHS-C, and OHS-D) and one video satellite (OVS-2A), which have excellent hyperspectral data acquisition abilities. For the first time in China, a number of hyperspectral satellite networks have been realized. To ensure the application of hyperspectral remote sensing data, a series of on-orbit geometry processing and accuracy verification studies has been carried out on the “Zhuhai-1” hyperspectral camera since the satelli
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9

Feng, Sheng, Xiaoqiang Hua, and Xiaoqian Zhu. "Matrix Information Geometry for Spectral-Based SPD Matrix Signal Detection with Dimensionality Reduction." Entropy 22, no. 9 (2020): 914. http://dx.doi.org/10.3390/e22090914.

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In this paper, a novel signal detector based on matrix information geometric dimensionality reduction (DR) is proposed, which is inspired from spectrogram processing. By short time Fourier transform (STFT), the received data are represented as a 2-D high-precision spectrogram, from which we can well judge whether the signal exists. Previous similar studies extracted insufficient information from these spectrograms, resulting in unsatisfactory detection performance especially for complex signal detection task at low signal-noise-ratio (SNR). To this end, we use a global descriptor to extract ab
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10

Zolotov, Denis, Alexey Buzmakov, Maxim Grigoriev, and Igor Schelokov. "Dual-energy crystal-analyzer scheme for spectral tomography." Journal of Applied Crystallography 53, no. 3 (2020): 781–88. http://dx.doi.org/10.1107/s1600576720005439.

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In the present work, a method for adjusting a crystal analyzer to separate two characteristic lines from the spectrum of a conventional X-ray tube for simultaneous registration of tomographic projections is proposed. The experimental implementation of this method using radiation of a molybdenum anode (Kα1, Kβ lines) and a silicon Si(111) crystal analyzer in Laue geometry is presented. Projection images at different wavelengths are separated in space and can be recorded independently for further processing. Potential uses of this scheme are briefly discussed.
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11

Saiko, Guennadi, and Alexandre Douplik. "Reflectance of Biological Turbid Tissues under Wide Area Illumination: Single Backward Scattering Approach." International Journal of Photoenergy 2014 (2014): 1–8. http://dx.doi.org/10.1155/2014/241364.

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Various scenarios of light propagation paths in turbid media (single backward scattering, multiple backward scattering, banana shape) are discussed and their contributions to reflectance spectra are estimated. It has been found that a single backward or multiple forward scattering quasi-1D paths can be the major contributors to reflected spectra in wide area illumination scenario. Such a single backward scattering (SBS) approximation allows developing of an analytical approach which can take into account refractive index mismatched boundary conditions and multilayer geometry and can be used fo
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12

Singh, S., D. Dutta, U. Singh, J. R. Sharma, and V. K. Dadhwal. "Hydat-A Hyperspectral Data Processing Tool for Field Spectroradiometer Data." ISPRS - International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences XL-8 (November 28, 2014): 481–84. http://dx.doi.org/10.5194/isprsarchives-xl-8-481-2014.

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A hyperspectral data processing tool "HyDAT" has been developed in MATLAB environment for processing of Field Spectroradiometer data for vegetation studies. Several basic functions e.g. data visualization, pre-processing, noise removal and data transformation and features like automatic absorption feature recovery and their characterization have been introduced. A new concept of spectral geometry has been included as a separate module which is conceptualized as triangle formed over spectral space joining the vertices of green reflectance peak, red well and inflection point and is extremely use
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13

Pavlov, Dmitrii V., Aleksey P. Porfirev, Anton Dyshliuk, and Aleksandr A. Kuchmizhak. "Coaxial Aperture Arrays Produced by Ultrafast Direct Femtosecond Laser Processing with Spatially Multiplexed Cylindrical Vector Beams." Solid State Phenomena 312 (November 2020): 148–53. http://dx.doi.org/10.4028/www.scientific.net/ssp.312.148.

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Direct femtosecond laser printing was used to fabricate circular-and coaxial-shaped hole arrays at ultrafast printing rate up to 106 elements per second. To achieve such fast printing rate, we implemented a spatial multiplexing of either a single Gaussian or cylindrical vector beams into linear array of identical laser spots. Being compared to ordinary microholes, the coaxial openings arranged at the same periodicity demonstrate enhanced transmission in the mid-IR spectral range resulted from coupling between localized electromagnetic mode supported by coaxial unit cell and the lattice-type su
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14

Cammarasana, Simone, and Giuseppe Patané. "Localised and shape-aware functions for spectral geometry processing and shape analysis: A survey & perspectives." Computers & Graphics 97 (June 2021): 1–18. http://dx.doi.org/10.1016/j.cag.2021.03.006.

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15

Gizdavec, Nikola, Mateo Gašparović, Slobodan Miko, Borna Lužar-Oberiter, Nikolina Ilijanić, and Zoran Peh. "Discrimination of Rock Units in Karst Terrains Using Sentinel-2A Imagery." Remote Sensing 14, no. 20 (2022): 5169. http://dx.doi.org/10.3390/rs14205169.

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We explored the potential incorporation of Sentinel-2A imagery for rock unit determination in the Croatian karst region dominated by carbonate rocks. The various lithological units are potential sources of both stone aggregates and dimension stone, and their spatial distribution is of high importance for mineral resource management. The presented approach included the preprocessing and processing of existing analog data (geological maps), Sentinel-2A satellite images and the United States Geological Survey spectral indices, all in combination with ground truth data. Geological mapping and digi
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16

Haider, Usman A., Muhammad Noman, Aamir Rashid, Hatem Rmili, Hidayat Ullah, and Farooq A. Tahir. "A Semi-Octagonal 40-Bit High Capacity Chipless RFID Tag for Future Product Identification." Electronics 12, no. 2 (2023): 349. http://dx.doi.org/10.3390/electronics12020349.

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This paper presents a unique geometry of a chipless radio frequency identification (RFID) tag for encoding a large number of bits in a very small form factor. The tag geometry consists of semi-octagonal copper strips, sequentially laid on a single side of an ultra-thin substrate. A unique and robust encoding mechanism for the tag identification (ID) is proposed. The operating frequency spectrum of the tag ranges from 3.1 to 10.5 GHz. The tag is compact, having an overall size of 14.5 × 28 mm2. The proposed tag exhibits very high code density of 9.85 bits/cm2 and spectral efficiency of 5.4 bits
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17

Radhadevi, P. V., S. S. Solanki, A. Akilan, M. V. Jyothi, and V. Nagasubramanian. "PERFORMANCE ASSESSMENT AND GEOMETRIC CALIBRATION OF RESOURCESAT-2." ISPRS - International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences XLI-B1 (June 3, 2016): 237–44. http://dx.doi.org/10.5194/isprsarchives-xli-b1-237-2016.

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Resourcesat-2 (RS-2) has successfully completed five years of operations in its orbit. This satellite has multi-resolution and multi-spectral capabilities in a single platform. A continuous and autonomous co-registration, geo-location and radiometric calibration of image data from different sensors with widely varying view angles and resolution was one of the challenges of RS-2 data processing. On-orbit geometric performance of RS-2 sensors has been widely assessed and calibrated during the initial phase operations. Since then, as an ongoing activity, various geometric performance data are bei
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18

Radhadevi, P. V., S. S. Solanki, A. Akilan, M. V. Jyothi, and V. Nagasubramanian. "PERFORMANCE ASSESSMENT AND GEOMETRIC CALIBRATION OF RESOURCESAT-2." ISPRS - International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences XLI-B1 (June 3, 2016): 237–44. http://dx.doi.org/10.5194/isprs-archives-xli-b1-237-2016.

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Resourcesat-2 (RS-2) has successfully completed five years of operations in its orbit. This satellite has multi-resolution and multi-spectral capabilities in a single platform. A continuous and autonomous co-registration, geo-location and radiometric calibration of image data from different sensors with widely varying view angles and resolution was one of the challenges of RS-2 data processing. On-orbit geometric performance of RS-2 sensors has been widely assessed and calibrated during the initial phase operations. Since then, as an ongoing activity, various geometric performance data are bei
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19

Cayre, F., P. Rondao-Alface, F. Schmitt, Benoı̂t Macq, and H. Maı̂tre. "Application of spectral decomposition to compression and watermarking of 3D triangle mesh geometry." Signal Processing: Image Communication 18, no. 4 (2003): 309–19. http://dx.doi.org/10.1016/s0923-5965(02)00147-9.

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20

SU, JUNYING, YINGKUI LI, and QINGWU HU. "A NEW SPECTRAL–SPATIAL JOINTED HYPERSPECTRAL IMAGE CLASSIFICATION APPROACH BASED ON FRACTAL DIMENSION ANALYSIS." Fractals 27, no. 05 (2019): 1950079. http://dx.doi.org/10.1142/s0218348x19500798.

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To maximize the advantages of both spectral and spatial information, we introduce a new spectral–spatial jointed hyperspectral image classification approach based on fractal dimension (FD) analysis of spectral response curve (SRC) in spectral domain and extended morphological processing in spatial domain. This approach first calculates the FD image based on the whole SRC of the hyperspectral image and decomposes the SRC into segments to derive the FD images with each SRC segment. These FD images based on the segmented SRC are composited into a multidimensional FD image set in spectral domain.
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21

Yablokov, A. V., A. S. Serdyukov, and R. A. Efremov. "Method of automated extracting dispersion curves based on time-frequency distribution of seismic data." Russian Journal of Geophysical Technologies, no. 3 (February 21, 2024): 4–16. http://dx.doi.org/10.18303/2619-1563-2023-3-4.

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This paper discusses examples of testing a new implementation of the method of multi-channel surface wave analysis on synthetic data computed for elastic media with complex boundary geometry. The new implementation of the method includes developed algorithms for noise-resistant spectral analysis based on time-frequency domain filtering of seismograms and inversion of dispersion curves of phase velocities based on determination of ranges of possible transverse wave velocity models and application of artificial neural networks. Based on the results of synthetic data processing, the accuracy, lat
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22

Shafiekhani, Azizollah, Nezafat Negin B., Mahmood Ghoranneviss, Seyed M. Elahi, Zohreh Ghorannevis, and Shahram Solaymani. "Microstructure, micromorphology, and fractal geometry of hard dental tissues: Evaluation of atomic force microscopy images." Microscopy Research and Technique 82, no. 11 (2019): 1884–90. https://doi.org/10.1002/jemt.23356.

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Determining surface topography of different tissues of the molar tooth with novel analytical methods has opened new horizons in dental surface measurements which characterize tooth surface quality in dentistry. Studying surface topological measurements and comparing surface morphology of hard tissue of the molar tooth are the ultimate goals of the present study. Ten molar teeth have been chosen for investigating their surface characteristics through image processing techniques. The power spectral density (PSD) and fast Fourier transform algorithms of every molar tooth containing enamel, dentin
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23

KLEMENT, STEPHAN, KARL W. KRATKY, and JOHANN NITTMANN. "PRACTICAL TIME-SERIES ANALYSIS WITH MULTIFRACTAL METHODS." Fractals 01, no. 03 (1993): 735–43. http://dx.doi.org/10.1142/s0218348x93000770.

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Time-series data of various origins are studied by analyzing their corresponding multifractal f(α)-spectral which are obtained by use of the so-called canonical method. The classes of data samples under investigation include: (a) airborne particle count data taken from an industrial cleanroom environment; (b) data generated by use of a (pseudo-)random number generator; and (c) data resulting from the iteration of the logistic map for the value r=4.0 of the control parameter, thus exhibiting chaotic behavior. From the resulting multifractal spectra, typical features of the f(α)-curve can be ide
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24

Bozsik, Éva, Tünde Fórián, Balázs Deák, et al. "Using integrated remote sensing methods in the Nagyerdő Natura 2000 area." Acta Agraria Debreceniensis, no. 55 (February 25, 2014): 19–24. http://dx.doi.org/10.34101/actaagrar/55/1903.

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The more widely use of GIS, remote sensing technology provides appropriate data acquisition and data processing tools to build several national and international biodiversity monitoring system of environmental protection and natur conservation. The ChangeHabitats 2 is a similar international project, which uses airborne hyperspectral and airborne laser scanning (airborne LiDAR) sources beyond traditional data collection methods to build a monitoring system of Natura 2000 habitats. The goal of our research, on one hand, was to separate the most typical species of trees which can be found in the
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25

Inkinen, Satu I., Mikael A. K. Juntunen, Juuso Ketola, et al. "Virtual monochromatic imaging reduces beam hardening artefacts in cardiac interior photon counting computed tomography: a phantom study with cadaveric specimens." Biomedical Physics & Engineering Express 8, no. 1 (2021): 015029. http://dx.doi.org/10.1088/2057-1976/ac4397.

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Abstract In interior cardiac computed tomography (CT) imaging, the x-ray beam is collimated to a limited field-of-view covering the heart volume, which decreases the radiation exposure to surrounding tissues. Spectral CT enables the creation of virtual monochromatic images (VMIs) through a computational material decomposition process. This study investigates the utility of VMIs for beam hardening (BH) reduction in interior cardiac CT, and further, the suitability of VMIs for coronary artery calcium (CAC) scoring and volume assessment is studied using spectral photon counting detector CT (PCD-C
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26

Musovic, Jasmin, Vlatko Lipovac, and Adriana Lipovac. "Stochastic Geometry-Based Analysis of Heterogeneous Wireless Network Spectral, Energy and Deployment Efficiency." Electronics 10, no. 7 (2021): 786. http://dx.doi.org/10.3390/electronics10070786.

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For quite a while, it has been evident that homogeneous network architectures, based on cells with a uniform radiation pattern, cannot fulfill the ever increasing demand of mobile users for capacity and service quality while still preserving spectrum and energy. However, only with the introduction of the Fourth Generation mobile communication networks to deal with the surging data traffic of multimedia applications, have smaller cells been widely used to break down service zone areas of macro base stations into multiple tiers, thus improving network performance, reducing traffic congestion, an
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27

Wang, Yang, Xiuqing Hu, Lin Chen, et al. "Comparison of the Lunar Models Using the Hyper-Spectral Imager Observations in Lijiang, China." Remote Sensing 12, no. 11 (2020): 1878. http://dx.doi.org/10.3390/rs12111878.

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A lunar observation campaign was conducted using a hyper-spectral imaging spectrometer in Lijiang, China from December 2015 to February 2016. The lunar hyper-spectral images in the visible to near-infrared region (VNIR) have been obtained in different lunar phases with absolute scale established by the National Institute of Metrology (NIM), China using the lamp–plate calibration system. At the same time, the aerosol optical depth (AOD) is measured regularly by a lidar and a lunar CE318U for atmospheric characterization to provide nightly atmosphere extinction correction of lunar observations.
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28

Yin, Jingwei, Xuan Zhou, Ran Cao, Chunlong Huang, Dewen Li, and Jiarui Yin. "Environmentally and statistically robust matched-field source localization based on information geometry principles." Journal of the Acoustical Society of America 156, no. 6 (2024): 3893–908. https://doi.org/10.1121/10.0034560.

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Matched-field processing (MFP) achieves underwater source localization by measuring the correlation between the array and replica signals, with traditional MFP being equivalent to estimating the Euclidean distance between the data cross-spectral density matrix (CSDM) and replica matrices. However, in practical applications, random inhomogeneities in the marine environment and inaccurate estimation of CSDM reduce MFP performance. The traditional minimum variance matched-field processor with environmental perturbation constraints perturbs a priori environment parameters to obtain linear constrai
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29

Johansson, Sara, Matteo Rossi, Stephen A. Hall, et al. "Combining spectral induced polarization with X-ray tomography to investigate the importance of DNAPL geometry in sand samples." GEOPHYSICS 84, no. 3 (2019): E173—E188. http://dx.doi.org/10.1190/geo2018-0108.1.

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Although many studies have been performed to investigate the spectral induced polarization (SIP) response of nonaqueous phase liquid (NAPL)-contaminated soil samples, there are still many uncertainties in the interpretation of the data. A key issue is that altered pore space geometries due to the presence of a NAPL phase will change the measured IP spectra. However, without any information on the NAPL distribution in the pore space, assumptions are necessary for the SIP data interpretation. Therefore, experimental data of SIP signals directly associated with different NAPL distributions are ne
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30

Makris, Alexandros, Vassilis C. Nicodemou, Evangelos Alevizos, Iason Oikonomidis, Dimitrios D. Alexakis, and Anastasios Roussos. "Refraction-Aware Structure from Motion for Airborne Bathymetry." Remote Sensing 16, no. 22 (2024): 4253. http://dx.doi.org/10.3390/rs16224253.

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In this work, we introduce the first pipeline that combines a refraction-aware structure from motion (SfM) method with a deep learning model specifically designed for airborne bathymetry. We accurately estimate the 3D positions of the submerged points by integrating refraction geometry within the SfM optimization problem. This way, no refraction correction as post-processing is required. Experiments with simulated data that approach real-world capturing conditions demonstrate that SfM with refraction correction is extremely accurate, with submillimeter errors. We integrate our refraction-aware
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31

Weidner, Elizabeth. "Measurements of broadband backscattering from the terminus of a tidewater glacier." Journal of the Acoustical Society of America 158, no. 1 (2025): 504–14. https://doi.org/10.1121/10.0037196.

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The submerged termini of tidewater glaciers are a critical, yet poorly characterized component of high latitude regions. While traditional oceanographic measurement techniques are limited by iceberg calving dangers, remote measurements made by active acoustic systems represent a useful, if underutilized, tool. This manuscript investigates the potential connections between ice face geometry, internal ice properties, and backscattering through broadband (170–250 kHz) split-beam echosounder observations collected over a range of grazing angles at Hans glacier in Svalbard. The ice face position an
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32

Bimanjaya, Alfian, Hepi Hapsari Handayani, and Reza Fuad Rachmadi. "Extraction of Road Network in Urban Area from Orthophoto Using Deep Learning and Douglas-Peucker Post-Processing Algorithm." IOP Conference Series: Earth and Environmental Science 1127, no. 1 (2023): 012047. http://dx.doi.org/10.1088/1755-1315/1127/1/012047.

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Abstract A Large-scale base map is needed by metropolitan cities such as Surabaya City for urban planning and smart city development. The most needed information from a large-scale base map is road geospatial information. Road network extraction is a challenging task for many reasons, including the heterogeneous attribute of the geometry and spectral, the complexity of objects that are difficult to model, and poor sensor data. Visual interpretation by operators is still a commonly used approach for extracting information from orthophoto. Interpretation accuracy depends on the skill and experie
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33

Gerasimos, Arvanitis, S. Lalos Aris, and Moustakas Konstantinos. "Robust and Fast 3-D Saliency Mapping for Industrial Modeling Applications." IEEE Transactions on Industrial Informatics 17, no. 2 (2020): 1307–17. https://doi.org/10.1109/TII.2020.3003455.

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New generation 3-D scanning technologies are expected to create a revolution at the Industry 4.0, facilitating a large number of virtual manufacturing tools and systems. Such applications require the accurate representation of physical objects and/or systems achieved through saliency estimation mechanisms that identify certain areas of the 3-D model, leading to a meaningful and easier to analyze representation of a 3-D object. 3-D saliency mapping is, therefore, guiding the selection of feature locations and is adopted in a large number of low-level 3-D processing applications including denois
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34

Olsansky, V., C. Granja, C. Oancea, et al. "Spectral-sensitive proton radiography of thin samples with the pixel detector Timepix3." Journal of Instrumentation 17, no. 04 (2022): C04016. http://dx.doi.org/10.1088/1748-0221/17/04/c04016.

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Abstract We evaluate a high-resolution contrast-enhanced method for energy-sensitive radiography of thin samples with low-energy protons at the light-ion Tandetron accelerator of the NPI-CAS in Rez near Prague. We make use of the high-sensitivity of the hybrid semiconductor pixel detectors Timepix enabled by integrated per-pixel signal processing electronics. For this work we use the Timepix3 ASIC chip equipped with a 500 µm Si sensor operated with the fast data rate AdvaPix readout electronics interface. Measurements are performed in air with a 2.9 MeV proton microbeam on thin samples (<10
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35

DAS, ATIN, and PRITHA DAS. "FRACTAL ANALYSIS OF DIFFERENT EASTERN AND WESTERN MUSICAL INSTRUMENTS." Fractals 14, no. 03 (2006): 165–70. http://dx.doi.org/10.1142/s0218348x06003192.

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In this paper, we attempt musical analysis by measuring fractal dimension (D) of musical pieces played by several musical instruments. We collected solo performances of popular instruments of Western and Eastern origin as samples. We attempted usual spectral analysis of the selected clips to observe peaks of fundamental and harmonics in frequency regime. After appropriate processing, we converted them into time series data sets and computed their fractal dimension. Based on our results, we conclude that instrumental musical sounds may have higher Ds than those computed from vocal performances
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36

Norda, M. E., A. Prapiga, P. Paraskevopoulos, and G. A. Tselentis. "A STUDY OF MICROTREMOR HVSR IN THE RIO-ANTIRIO AREA, (GREECE)." Bulletin of the Geological Society of Greece 50, no. 3 (2017): 1194. http://dx.doi.org/10.12681/bgsg.11825.

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Horizontal to Vertical Spectral Ratio (HVSR) method has been applied on ambient noise records at the Rio- Antirio area (central Greece). The dataset used was recorded during 7 days by 12 temporary seismic stations deployed in the area. The stations were laid out along a profile and their interval was approximately 500m. The main part of the processing was done using Geopsy software. The aim of this study was to estimate the fundamental frequency at the station sites and its variation with time and azimuth. The processing results showed that for most stations along the profile, the peaks of the
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37

Tu, Yu-Hsuan, Stuart Phinn, Kasper Johansen, and Andrew Robson. "Assessing Radiometric Correction Approaches for Multi-Spectral UAS Imagery for Horticultural Applications." Remote Sensing 10, no. 11 (2018): 1684. http://dx.doi.org/10.3390/rs10111684.

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Multi-spectral imagery captured from unmanned aerial systems (UAS) is becoming increasingly popular for the improved monitoring and managing of various horticultural crops. However, for UAS-based data to be used as an industry standard for assessing tree structure and condition as well as production parameters, it is imperative that the appropriate data collection and pre-processing protocols are established to enable multi-temporal comparison. There are several UAS-based radiometric correction methods commonly used for precision agricultural purposes. However, their relative accuracies have n
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38

Krauß, T. "Exploiting Satellite Focal Plane Geometry for Automatic Extraction of Traffic Flow from Single Optical Satellite Imagery." ISPRS - International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences XL-1 (November 7, 2014): 179–87. http://dx.doi.org/10.5194/isprsarchives-xl-1-179-2014.

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The focal plane assembly of most pushbroom scanner satellites is built up in a way that different multispectral or multispectral and panchromatic bands are not all acquired exactly at the same time. This effect is due to offsets of some millimeters of the CCD-lines in the focal plane. Exploiting this special configuration allows the detection of objects moving during this small time span. In this paper we present a method for automatic detection and extraction of moving objects – mainly traffic – from single very high resolution optical satellite imagery of different sensors. The sensors inves
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39

Kornus, W., A. Magariños, M. Pla, E. Soler, and F. Perez. "PHOTOGRAMMETRIC PROCESSING USING ZY-3 SATELLITE IMAGERY." ISPRS - International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences XL-3/W2 (March 10, 2015): 109–13. http://dx.doi.org/10.5194/isprsarchives-xl-3-w2-109-2015.

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This paper evaluates the stereoscopic capacities of the Chinese sensor ZiYuan-3 (ZY-3) for the generation of photogrammetric products. The satellite was launched on January 9, 2012 and carries three high-resolution panchromatic cameras viewing in forward (22º), nadir (0º) and backward direction (-22º) and an infrared multi-spectral scanner (IRMSS), which is slightly looking forward (6º). The ground sampling distance (GSD) is 2.1m for the nadir image, 3.5m for the two oblique stereo images and 5.8m for the multispectral image. The evaluated ZY-3 imagery consists of a full set of threefold-stere
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40

Rout, Nibedita, George Baciu, Priyabrata Pattanaik, K. Nakkeeran, and Asimananda Khandual. "Color and Texture Analysis of Textiles Using Image Acquisition and Spectral Analysis in Calibrated Sphere Imaging System-I." Electronics 11, no. 23 (2022): 3887. http://dx.doi.org/10.3390/electronics11233887.

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Numerous imaging applications and analyses demand human perception, and color space transformation of device-dependent tri-band color interpretation (RGB) to device-independent CIE color space standards needs human intervention. The imaging acquisition environment, theoretical conversion errors, viewing geometry, well-defined illumination uniformity, and calibration protocols limit their precision and applicability. It is unfortunate that in most image processing applications, the spectral data are either unavailable or immeasurable. This study is based on developing a novel integrating sphere
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41

Faucher, Nicholas, Michael R. Blanton, and Andrea V. Macciò. "Panchromatic Simulated Galaxy Observations from the NIHAO Project." Astrophysical Journal 957, no. 1 (2023): 7. http://dx.doi.org/10.3847/1538-4357/acf9f0.

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Abstract We present simulated galaxy spectral energy distributions (SEDs) from the far-ultraviolet (FUV) through the far-infrared (FIR), created using hydrodynamic simulations and radiative transfer calculations, suitable for the validation of SED modeling techniques. SED modeling is an essential tool for inferring star formation histories from nearby galaxy observations, but it is fraught with difficulty due to our incomplete understanding of stellar populations, chemical enrichment processes, and the nonlinear, geometry-dependent effects of dust on our observations. Our simulated SEDs will a
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42

He, Yingli, Dongqin Zhao, Zhenqi Fan, An Lu, Xinjiang Xia, and Dongming Wang. "Coverage and Spectral Efficiency of Network Assisted Full Duplex in a Millimeter Wave System." Electronics 11, no. 1 (2021): 5. http://dx.doi.org/10.3390/electronics11010005.

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To cope with the growing trend of asymmetric data traffic, we introduce a novel network assisted full duplex (NAFD) for a millimeter wave system. NAFD can dynamically allocate the number of remote radio heads in the uplink mode or in the downlink mode, which can facilitate simultaneous uplink and downlink communications. In this manuscript, we use stochastic geometry to analyze the distribution of the signal-to-interference-plus-noise ratio and the data rate in a NAFD system. The numerical results verify the analysis and show that the NAFD outperforms the dynamic time division duplex system an
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43

Ramyasree, Kummari, and Chennupati Sumanth Kumar. "Acoustic and visual geometry descriptor for multi-modal emotion recognition fromvideos." Indonesian Journal of Electrical Engineering and Computer Science 33, no. 2 (2024): 960. http://dx.doi.org/10.11591/ijeecs.v33.i2.pp960-970.

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<span>Recognizing human emotions simultaneously from multiple data modalities (e.g., face, and speech) has drawn significant research interest, and numerous research contributions have been investigated in the affective computing community. However, most methods concentrate less on facial alignment and keyframe selection for audio-visual input. Hence, this paper proposed a new audio-visual descriptor, mainly concentrating on describing the emotion through only a few frames. For this purpose, we proposed a new self-similarity distance matrix (SSDM), which computes the spatial, and tempora
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44

Johnson, Joel B., Kerry B. Walsh, Mani Naiker, and Kashif Ameer. "The Use of Infrared Spectroscopy for the Quantification of Bioactive Compounds in Food: A Review." Molecules 28, no. 7 (2023): 3215. http://dx.doi.org/10.3390/molecules28073215.

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Infrared spectroscopy (wavelengths ranging from 750–25,000 nm) offers a rapid means of assessing the chemical composition of a wide range of sample types, both for qualitative and quantitative analyses. Its use in the food industry has increased significantly over the past five decades and it is now an accepted analytical technique for the routine analysis of certain analytes. Furthermore, it is commonly used for routine screening and quality control purposes in numerous industry settings, albeit not typically for the analysis of bioactive compounds. Using the Scopus database, a systematic sea
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45

Bai, Ling, Yinguo Li, and Ming Cen. "Dynamic Intervisibility Analysis of 3D Point Clouds." ISPRS International Journal of Geo-Information 10, no. 11 (2021): 782. http://dx.doi.org/10.3390/ijgi10110782.

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With the popularity of ground and airborne three-dimensional laser scanning hardware and the development of advanced technologies for computer vision in geometrical measurement, intelligent processing of point clouds has become a hot issue in artificial intelligence. The intervisibility analysis in 3D space can use viewpoint, view distance, and elevation values and consider terrain occlusion to derive the intervisibility between two points. In this study, we first use the 3D point cloud of reflected signals from the intelligent autonomous driving vehicle’s 3D scanner to estimate the field-of-v
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46

Miclea, Andreia Valentina, Romulus Mircea Terebes, Serban Meza, and Mihaela Cislariu. "On Spectral-Spatial Classification of Hyperspectral Images Using Image Denoising and Enhancement Techniques, Wavelet Transforms and Controlled Data Set Partitioning." Remote Sensing 14, no. 6 (2022): 1475. http://dx.doi.org/10.3390/rs14061475.

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Obtaining relevant classification results for hyperspectral images depends on the quality of the data and the proposed selection of the samples and descriptors for the training and testing phases. We propose a hyperspectral image classification machine learning framework based on image processing techniques for denoising and enhancement and a parallel approach for the feature extraction step. This parallel approach is designed to extract the features by employing the wavelet transform in the spectral domain, and by using Local Binary Patterns to capture the texture-like information linked to t
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47

Yang, Ye, Yongli Hu, and Fei Wu. "Sparse and Low-Rank Subspace Data Clustering with Manifold Regularization Learned by Local Linear Embedding." Applied Sciences 8, no. 11 (2018): 2175. http://dx.doi.org/10.3390/app8112175.

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Data clustering is an important research topic in data mining and signal processing communications. In all the data clustering methods, the subspace spectral clustering methods based on self expression model, e.g., the Sparse Subspace Clustering (SSC) and the Low Rank Representation (LRR) methods, have attracted a lot of attention and shown good performance. The key step of SSC and LRR is to construct a proper affinity or similarity matrix of data for spectral clustering. Recently, Laplacian graph constraint was introduced into the basic SSC and LRR and obtained considerable improvement. Howev
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48

Jurado, J. M., L. Ortega, J. J. Cubillas, and F. R. Feito. "Multispectral Mapping on 3D Models and Multi-Temporal Monitoring for Individual Characterization of Olive Trees." Remote Sensing 12, no. 7 (2020): 1106. http://dx.doi.org/10.3390/rs12071106.

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3D plant structure observation and characterization to get a comprehensive knowledge about the plant status still poses a challenge in Precision Agriculture (PA). The complex branching and self-hidden geometry in the plant canopy are some of the existing problems for the 3D reconstruction of vegetation. In this paper, we propose a novel application for the fusion of multispectral images and high-resolution point clouds of an olive orchard. Our methodology is based on a multi-temporal approach to study the evolution of olive trees. This process is fully automated and no human intervention is re
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49

Artyukov, Igor A., Nikolay L. Popov, and Alexander V. Vinogradov. "Lensless Reflection Imaging of Obliquely Illuminated Objects I: Choosing a Domain for Phase Retrieval and Ptychography." Symmetry 13, no. 8 (2021): 1439. http://dx.doi.org/10.3390/sym13081439.

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Ptychography is a lensless imaging technology that is validated from hard X-rays to terahertz spectral range. It is most attractive for extreme ultraviolet (EUV) and X-rays as optical elements are expensive and often not available. Typically, the set up involves coherently illuminated object that directs the scattered radiation normally to detector which is parallel to the object plane. Computer processing of diffraction patterns obtained when scanning the object gives the image, more precisely, the distribution of intensity and phase on its surface. However, this scheme is inefficient for EUV
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50

Trokhimovskiy, A., V. Perevalov, O. Korablev та ін. "First observation of the magnetic dipole CO2 absorption band at 3.3 μm in the atmosphere of Mars by the ExoMars Trace Gas Orbiter ACS instrument". Astronomy & Astrophysics 639 (липень 2020): A142. http://dx.doi.org/10.1051/0004-6361/202038134.

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The atmosphere of Mars is dominated by CO2, making it a natural laboratory for studying CO2 spectroscopy. The Atmospheric Chemistry Suite (ACS) on board the ExoMars Trace Gas Orbiter uses solar occultation geometry to search for minor atmospheric species. During the first year of ACS observations, the attention was focused on the spectral range covering the methane ν3 absorption band, 2900–3300 cm−1, which has previously been observed on Mars. No methane was detected by ACS; instead, an improvement of the data processing has led to the identification of 30 weak absorption lines that were missi
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