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Tytuł:
Ultrasonic flow measurement with high resolution
Autorzy:
Grzelak, S.
Czoków, J.
Kowalski, M.
Zieliński, M.
Powiązania:
https://bibliotekanauki.pl/articles/221448.pdf
Data publikacji:
2014
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
ultrasonic flowmeter
time-to-digital converter
programmable logic device
time measurement
Opis:
The ultrasonic flowmeter which is described in this paper, measures the transit of time of an ultrasonic pulse. This device consists of two ultrasonic transducers and a high resolution time interval measurement module. An ultrasonic transducer emits a characteristic wave packet (transmit mode). When the transducer is in receive mode, a characteristic wave packet is formed and it is connected to the time interval measurement module inputs. The time interval measurement module allows registration of transit time differences of a few pulses in the packet. In practice, during a single measuring cycle a few time-stamps are registered. Moreover, the measurement process is also synchronous and, by applying the statistics, the time interval measurement uncertainty improves even in a single measurement. In this article, besides a detailed discussion on the principle of operation of the ultrasonic flowmeter implemented in the FPGA structure, also the test results are presented and discussed.
Źródło:
Metrology and Measurement Systems; 2014, 21, 2; 305-316
0860-8229
Pojawia się w:
Metrology and Measurement Systems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
High resolution multi-beam side looking sonar
Autorzy:
Elminowicz, A,
Zajączkowski, L.
Powiązania:
https://bibliotekanauki.pl/articles/332745.pdf
Data publikacji:
2005
Wydawca:
Polskie Towarzystwo Akustyczne
Opis:
The conventional side–scan sonars does not ensure sufficient angular and range resolution to detect very small objects with small target strength. Decrease of beam width leads to the increase of angular resolution but requires the decrease of towing speed what means reduction of searched area. Other method of the angular resolution increased is designing multi–beam sonar or sonar with synthetic aperture. The paper presents a design of effective multi–beam side looking sonars with a large angular and range resolution operates with 100 kHz, 200 kHz, 400 kHz and 600 kHz. The sonar, described in the paper, operates with 200 kHz frequency; LFM modulation – 20 kHz and 40 kHz band; array provides 32 elements with d/ë spacing what ensure a shaping of 5 or 9 beams with 0,40° width. The range of sonar is from 250 m to 300 m, the level of side lobes are smaller than -20 dB and level of grating lobes for 5 beams are smaller than -30 dB. The principle of sonar performance and wideband effective processing are presented. Effectiveness of processing depends on beams number and decrease of beams number, together with the range increased, leads to increase of processing effectiveness.
Źródło:
Hydroacoustics; 2005, 8; 37-46
1642-1817
Pojawia się w:
Hydroacoustics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Use of very high resolution satellite imagery
Autorzy:
Jacobsen, K.
Powiązania:
https://bibliotekanauki.pl/articles/130521.pdf
Data publikacji:
2004
Wydawca:
Stowarzyszenie Geodetów Polskich
Tematy:
zdjęcia satelitarne
satelita Landsat
rozdzielczość zdjęć
satellite imagery
Landsat satelite
resolution photos
Źródło:
Archiwum Fotogrametrii, Kartografii i Teledetekcji; 2004, 14; 1-12
2083-2214
2391-9477
Pojawia się w:
Archiwum Fotogrametrii, Kartografii i Teledetekcji
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
High Resolution X-ray Reciprocal Space Mapping
Autorzy:
Bauer, G.
Li, J. H.
Holy, V.
Powiązania:
https://bibliotekanauki.pl/articles/1943985.pdf
Data publikacji:
1996-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
61.10.-i
68.55.-a
61.72.Lk
Opis:
A survey will be given on recent advances in the investigation of semiconductor epilayers, heterostructures and superlattices using reciprocal space mapping techniques based on triple-axis diffractometry. It is shown that X-ray reciprocal space mapping yields quantitative information on strain, strain relaxation, as well as composition in such structures. These data are obtained from analyses of the isointensity contours of scattered X-ray intensity around reciprocal lattice points. Further analysis of the diffuse scattering yields also information on defect distribution in the epilayers.
Źródło:
Acta Physica Polonica A; 1996, 89, 2; 115-127
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
High Resolution Spectroscopy of Cold, Trapped Atoms
Autorzy:
Brzozowski, T.
Brzozowska, M.
Zachorowski, J.
Gawlik, W.
Powiązania:
https://bibliotekanauki.pl/articles/1814200.pdf
Data publikacji:
2007-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
32.80.Pj
42.50.Vk
42.65.-k
Opis:
Pump-probe spectroscopy of cold, trapped atoms is discussed with particular attention to mechanisms specific for cold atoms and potential diagnostics applications. The discussion is illustrated with experimental results obtained with $\text{}^{85}Rb$ atoms trapped in a magneto-optical trap. Most important applications are non-destructive, real-time velocimetry (thermometry) and analysis of optical lattice dynamics.
Źródło:
Acta Physica Polonica A; 2007, 112, 5; 783-790
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
High Resolution Noise Radar without Fast ADC
Autorzy:
Lukin, K. A.
Vyplavin, P. L.
Zemlyaniy, O. V.
Palamarchuk, V. P.
Lukin, S. K.
Powiązania:
https://bibliotekanauki.pl/articles/227347.pdf
Data publikacji:
2012
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
noise waveform
stepped frequency
stepped delay
Opis:
Conventional digital signal processing scheme in noise radars has certain limitations related to combination of high resolution and high dynamic range. The bandwidth of radar signal defines range resolution of any radar: the wider the spectrum the better the resolution. In noise radar with conventional processing the sounding and reference signals are to be digitized at intermediate frequency band and to be processed digitally. The power spectrum bandwidth of noise signal which can be digitized with ADC depends on its sampling rate. In currently available ADCs the faster is sampling rate the smaller is its depth (number of bits). Depth of the ADC determines relation between the smallest and highest observable signals and thus limits its dynamic range. Actually this is the main bottleneck of high resolution Noise Radars: conventional processing does not enable getting high range resolution and high dynamic range at the same time. In the paper we discuss ways to go around this drawback by changing signal processing ideology in noise radar. We present results of our consideration and design of two types of high resolution Noise Radar which uses slow ADCs: noise radar with digital generation of sounding signal and analog evaluation of cross-correlation and stepped frequency noise radar. We describe main ideas of these radar schemes and results of experimental tests of the approaches.
Źródło:
International Journal of Electronics and Telecommunications; 2012, 58, 2; 135-140
2300-1933
Pojawia się w:
International Journal of Electronics and Telecommunications
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
High Resolution Tips for Switching Magnetization MFM
Autorzy:
Precner, M.
Fedor, J.
Tóbik, J.
Šoltýs, J.
Cambel, V.
Powiązania:
https://bibliotekanauki.pl/articles/1372464.pdf
Data publikacji:
2014-07
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.75.+a
75.70.-i
68.37.Rt
75.60.Jk
81.15.Ef
02.30.Nw
Opis:
Switching magnetization magnetic force microscopy (SM-MFM) is based on two-pass magnetic force microscopy with opposite orientation of tip magnetization between two scans. The sum of the scanned data with reversed tip magnetization depicts local van der Waals forces, and their difference maps the local magnetic forces. Tip magnetization can be easily reversed in external magnetic field during the scanning. The separation of the forces mapped enables scanning in close proximity of the sample (~5 nm). Therefore, extremely high spatial resolution (10 nm) is achievable by the SM-MFM. Image phase resolution of the MFM method depends on various geometric parameters of the tip, such as tip length, its apex radius and taper angle. The parameters are determined by the evaporation process, within which the standard atomic force microscopy tips are coated with magnetic layer. In this work we show that the thickness of the coated layer is important for the SM-MFM spatial resolution.
Źródło:
Acta Physica Polonica A; 2014, 126, 1; 386-387
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Wysokorozdzielcza krystalografia makromolekuł
High resolution crystallography of macromolecules
Autorzy:
Gilski, M.
Powiązania:
https://bibliotekanauki.pl/articles/172659.pdf
Data publikacji:
2014
Wydawca:
Polskie Towarzystwo Chemiczne
Tematy:
krystalografia makromolekuł
struktury o rozdzielczości atomowej
więzy stereochemiczne
gęstość ładunku
macromolecular crystallography
atomic resolution structures
stereochemical restraints
charge density
Opis:
The recent developments and availability of modern third-generation synchrotron radiation facilities have a huge impact on macromolecular X-ray crystallography. In connection with a number of methodological improvements and new crystallographic software ranging from data processing to refinement, a unique opportunity has arisen to determine the macromolecular structures with unprecedented high resolution and quality, at a level traditionally reserved for small molecules. At this resolution, individual atoms are clearly resolved and fine details of the structures become visible directly in the electron density maps. The great importance of such structures is the possibility of having broader insights into macromolecule function. At very high resolution, hydrogen atoms can be seen in electron density maps and the detailed information about the protonation states of catalytically important residues can be studied, what often is critical for full understanding of enzymatic reactions. Atomic resolution gives the opportunity for clear definition of multiple conformations, although the proportion of disordered residues is higher at higher resolution, and the disorder is seen as distinct alternative conformations. Water in macromolecular crystal plays an important role in macromolecule’s function and stabilization. Ultrahigh resolution data allows to refine water molecules with anisotropic displacement parameters and refine them with fractional occupancies. In this situation analyzing the subtle hydrogen bond network, involving precisely located water molecules, is possible. Atomic resolution structures can be refined without or with only very weak stereochemical restraints. Macromolecular models refined at ultrahigh resolutions, for well ordered structures, can be used for validation and improvement of stereochemical restraint libraries, commonly used during refinement of macromolecular structures.
Źródło:
Wiadomości Chemiczne; 2014, 68, 5-6; 587-607
0043-5104
2300-0295
Pojawia się w:
Wiadomości Chemiczne
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Uzyskiwanie termogramów o wysokiej rozdzielczości
Obtaining high resolution thermograms
Autorzy:
Zator, S.
Lasar, M.
Powiązania:
https://bibliotekanauki.pl/articles/156024.pdf
Data publikacji:
2011
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
termografia
rozdzielczość
korekta
zniekształcenia
thermographs
resolution
correction
distortion
Opis:
W artykule przedstawiono sposób uzyskania termogramów z kamery wyposażonej w teleobiektyw, pozwalający uzyskać rozdzielczość 16-krotnie większą od standardowego. Korzystając z kamery o matrycy 320x240 pikseli uzyskano termogram o rozdzielczości 1,3 MPix w sposób zbliżony do tworzenia zdjęć typu panorama. Zautomatyzowany pomiar uzyskano przy pomocy precyzyjnej dwuosiowej obrotnicy, na której zainstalowano kamerę. Opracowano aplikację w środowisku LabVIEW z wykorzystaniem sterownika CompactRIO Real-Time Controller. W artykule przedstawione zostały wyniki działania programu.
The highest-resolution of matrices in thermovision cameras are 0.3 Mpix. One company offers a camera with a resolution of 1280x960 (1.3 megapixel) which was achieved by installing matrix on the micro-positioner. The paper describes how to obtain thermal images from a camera equipped with telephoto field of view 16-fold greater than the standard lens and shows a distortion correction process which exists in the lenses. Using the camera with a matrix of 320x240 pixels there was obtained a thermogram with a 1.3 megapixel camera in a similar way to creation of panorama images. The automated measurement was obtained using a biaxial turntable on which the camera was installed. There was worked out the application in LabVIEW environment with use of a controller CompactRIO Real-Time Controller for controlling stepper motors. The application allows connecting sequences of thermograms. The composed thermograms can be analyzed by the software that come with the camera. The results of the program running are presented in the paper.
Źródło:
Pomiary Automatyka Kontrola; 2011, R. 57, nr 12, 12; 1480-1482
0032-4140
Pojawia się w:
Pomiary Automatyka Kontrola
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Application of high resolution methods to underwater data processing
Autorzy:
Minassian, G. R.
Powiązania:
https://bibliotekanauki.pl/articles/332479.pdf
Data publikacji:
1997
Wydawca:
Polskie Towarzystwo Akustyczne
Opis:
The statistical approach to the high resolution acoustic signal parameter estimation is considered. The models of the Green's function for a deterministic and a random oceanic waveguide are presented. A brief discussion of popular superresolution methods with application to direction-of-arrival (DOA) and travel time estimation is done. Application of high resolution methods (HRM) to underwater data processing requires that certain modeling assumptions be made. Using maximum likelihood theory, the optimum processing algorithm for amplitudes, angles of arrival and travel times estimation is developed. The proposed techniques take into account the deterministic and the stochastic structure of the acoustic field.
Źródło:
Hydroacoustics; 1997, 1; 209-212
1642-1817
Pojawia się w:
Hydroacoustics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
High Resolution Eddy Current Tomography System for Nondestructive Testing
Autorzy:
Salach, J.
Szewczyk, R.
Powiązania:
https://bibliotekanauki.pl/articles/1202343.pdf
Data publikacji:
2014-07
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
81.70.Ex
81.70.Tx
Opis:
Idea of the high-resolution eddy current tomography is presented. Proposed system gives possibility of testing cylinder-shaped elements made of both magnetic and non-magnetic materials. To validate the concept, the tomographic measurements are carried out on set of steel cylinders with non-magnetic copper inclusion. Measurements were done during both linear and rotational movement of the element. Achieved results indicate the high sensitivity of system, which creates possibility of its application for non-destructive testing of the elements made of ferromagnetic and non-magnetic materials.
Źródło:
Acta Physica Polonica A; 2014, 126, 1; 402-403
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Performance of a High-Resolution Digital Positron-Lifetime Spectrometer
Autorzy:
Bečvář, F.
Čížek, J.
Procházka, I.
Powiązania:
https://bibliotekanauki.pl/articles/1812465.pdf
Data publikacji:
2008-05
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
78.70.Bj
Opis:
This work describes a digital positron-lifetime spectrometer based on two ultrafast digitizers. Performance of the digital spectrometer in conditions of a routine measurement is compared with an analogue setup connected to the same detectors. It was found that engagement of the digital setup leads to an improvement of timing resolution (FWHM for $\text{}^{22}Na$) from 169 ps for the traditional analogue setup to 146 ps for the digital setup. The coincidence count rate for 1.2 MBq $\text{}^{22}Na$ source is 75-80 coinc./s for both configurations. These results clearly demonstrate the advantages of the digital timing over the traditional analogue setup.
Źródło:
Acta Physica Polonica A; 2008, 113, 5; 1279-1284
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
High-resolution thermal face dataset for face and expression recognition
Autorzy:
Kowalski, M.
Grudzień, A.
Powiązania:
https://bibliotekanauki.pl/articles/221388.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
face database
biometrics
thermal face recognition
infrared
face re-identification
Opis:
Development of facial recognition or expression recognition algorithms requires input data to thoroughly test the performance of algorithms in various conditions. Researchers are developing various methods to face challenges like illumination, pose and expression changes, as well as facial disguises. In this paper, we propose and establish a dataset of thermal facial images, which contains a set of neutral images in various poses as well as a set of facial images with different posed expressions collected with a thermal infrared camera. Since the properties of face in the thermal domain strongly depend on time, in order to show the impact of aging, collection of the dataset has been repeated and a corresponding set of data is provided. The paper describes the measurement methodology and database structure. We present baseline results of processing using state-of-the-art facial descriptors combined with distance metrics for thermal face re-identification. Three selected local descriptors, a histogram of oriented gradients, local binary patterns and local derivative patterns are used for elementary assessment of the database. The dataset offers a wide range of capabilities - from thermal face recognition to thermal expression recognition.
Źródło:
Metrology and Measurement Systems; 2018, 25, 2; 403-415
0860-8229
Pojawia się w:
Metrology and Measurement Systems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Application of High-Resolution 3D Scanning in Medical Volumetry
Autorzy:
Chromy, A.
Powiązania:
https://bibliotekanauki.pl/articles/226316.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
medical volumetry
medical 3D scanning
3D scanning
medical imaging
soft tissues
Opis:
This paper deals with application of 3D scanning technology in medicine. Important properties of 3D scanners are discussed with emphasize on medical applications. Construction of medical 3D scanner according to these specifications is described and practical application of its use in medical volumetry is presented. Besides volumetry, such 3D scanner is usable for many other purposes, like monitoring of recovery process, ergonomic splint manufacturing or inflammation detection. 3D scanning introduces novel volumetric method, which is compared with standard methods. The new method is more accurate compared to present ones. Principles of this method are discussed in paper and its accuracy is evaluated and experimentally verified.
Źródło:
International Journal of Electronics and Telecommunications; 2016, 62, 1; 23-31
2300-1933
Pojawia się w:
International Journal of Electronics and Telecommunications
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Feature extraction in high-resolution raster images using neural networks
Autorzy:
Iwaniak, A.
Kubik, T.
Paluszyński, W.
Tymków, P.
Powiązania:
https://bibliotekanauki.pl/articles/225883.pdf
Data publikacji:
2006
Wydawca:
Politechnika Warszawska. Wydział Geodezji i Kartografii
Tematy:
GIS projekt
sieci neuronowe
GIS project
neural network
Źródło:
Reports on Geodesy; 2006, z. 2/77; 263-271
0867-3179
Pojawia się w:
Reports on Geodesy
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Classification of high resolution satellite images using improved U-Net
Autorzy:
Wang, Yong
Zhang, Dongfang
Dai, Guangming
Powiązania:
https://bibliotekanauki.pl/articles/331235.pdf
Data publikacji:
2020
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
satellite image classification
deep learning
U-net
spatial pyramid pooling
zdjęcia satelitarne
uczenie głębokie
Opis:
Satellite image classification is essential for many socio-economic and environmental applications of geographic information systems, including urban and regional planning, conservation and management of natural resources, etc. In this paper, we propose a deep learning architecture to perform the pixel-level understanding of high spatial resolution satellite images and apply it to image classification tasks. Specifically, we augment the spatial pyramid pooling module with image-level features encoding the global context, and integrate it into the U-Net structure. The proposed model solves the problem consisting in the fact that U-Net tends to lose object boundaries after multiple pooling operations. In our experiments, two public datasets are used to assess the performance of the proposed model. Comparison with the results from the published algorithms demonstrates the effectiveness of our approach.
Źródło:
International Journal of Applied Mathematics and Computer Science; 2020, 30, 3; 399-413
1641-876X
2083-8492
Pojawia się w:
International Journal of Applied Mathematics and Computer Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
High resolution time-interval measurement systems applied to flow measurement
Autorzy:
Grzelak, S.
Kowalski, M.
Czoków, J.
Zieliński, M.
Powiązania:
https://bibliotekanauki.pl/articles/221586.pdf
Data publikacji:
2014
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
FPGA
time-to-digital converter
multi-segment delay line
carry chain
Opis:
The designing process of high resolution time interval measurement systems creates many problems that need to be eliminated. The problems are: the latch error, the nonlinearity conversion, the different duty cycle coefficient of the clock signal, and the clock signal jitter. Factors listed above affect the result of measurement. The FPGA (Field Programmable Gate Array) structure also imposes some restrictions, especially when a tapped delay line is constructed. The article describes the high resolution time-to-digital converter, implemented in a FPGA structure, and the types of errors that appear there. The method of minimization and processing of data to reduce the influence of errors on the measurement is also described.
Źródło:
Metrology and Measurement Systems; 2014, 21, 1; 77-84
0860-8229
Pojawia się w:
Metrology and Measurement Systems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Methodology and indications for high-resolution sonography (HRUS) of the nerves
Autorzy:
Bohm, Josef
Powiązania:
https://bibliotekanauki.pl/articles/552281.pdf
Data publikacji:
2015
Wydawca:
Stowarzyszenie Przyjaciół Medycyny Rodzinnej i Lekarzy Rodzinnych
Tematy:
high-resolution ultrasound
peripheral nerve entrapment-syndrome
injuries of the peripheral nerves
tumors of the
peripheral nerve sheath
polyneuropathy
nerve torsion
Źródło:
Family Medicine & Primary Care Review; 2015, 4; 306-311
1734-3402
Pojawia się w:
Family Medicine & Primary Care Review
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
High resolution methods of the analysis of acoustic signals in medicine
Autorzy:
Lis, W.
Schmidt, J.
Powiązania:
https://bibliotekanauki.pl/articles/332161.pdf
Data publikacji:
1999
Wydawca:
Polskie Towarzystwo Akustyczne
Opis:
The paper describes an analysis of the possible parametric methods used to estimate the spectrum of short acoustic signals of law oscillations. These kinds of signals often appear in acoustic waves emitted by the temporomandibular joint as it moves [1-2,5]. There is reason to suppose that the frequency which is characteristic of these oscillations could be an essential parameter confirming the pathology of the joint under examination. The measurement of low oscillations is difficult and not accurate, especially when nonparametric methods are used. The paper presents the results of analysis of a simulated short oscillating pulse using the DFT non-parametric method and the parametric method of linear prediction, using Burg algorithm. Finally, results of patient analysis are given, using the FFT and parametric methods.
Źródło:
Hydroacoustics; 1999, 2; 335-340
1642-1817
Pojawia się w:
Hydroacoustics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Practical application of high resolution ground penetrating radar method inside buildings
Autorzy:
Mazurek, E.
Łyskowski, M.
Powiązania:
https://bibliotekanauki.pl/articles/184545.pdf
Data publikacji:
2012
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
GPR
sleeve
high frequency GPR antenna
foundations of buldings
reinforced concrete
Opis:
An infrastructure development requires a precise indoor localization plan of cables, pipes or reinforcing elements. Due to the age of many buildings in Poland such plans often do not exist or do not contain the evidence of numerous activities carried out over years like repairs or modifications. Due to this situation demands for application of geophysical methods grow, especially with respect to the Ground Penetrating Radar (GPR) method. A possibility of precise localization of hidden objects arises with the use of high frequency antennas together and with precise measuring grid. Research carried out at the request of one of the departments of AGH University of Science and Technology in building B2 showed great potential of GPR methods in this field. The study was devoted to recognition of structure of the concrete floor. The obtained results gave very precise location of numerous objects of interest and they became a good sample of high resolution investigations. The survey was performed with ProEx unit, produced by a Swedish company - Mala Geoscience, which is in the possession of the Department of Geophysics, Faculty of Geology, Geophysics and Environmental Protection.
Źródło:
Geology, Geophysics and Environment; 2012, 38, 4; 439-448
2299-8004
2353-0790
Pojawia się w:
Geology, Geophysics and Environment
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Identifying and Analyzing Safety Critical Maneuvers from High Resolution AIS Data
Autorzy:
Mestl, T.
Tallakstad, K.T.
Castberg, R.
Powiązania:
https://bibliotekanauki.pl/articles/117375.pdf
Data publikacji:
2016
Wydawca:
Uniwersytet Morski w Gdyni. Wydział Nawigacyjny
Tematy:
AIS Data
Automatic Identification System (AIS)
High Resolution AIS Data
Critical Maneuvers
1-2-3 Rule
vessel traffic service (VTS)
AIS Transponder
Safety of Navigation
Opis:
We demonstrate the value in previously disregarded parameters in AIS data, and present a novel way of quickly identifying and characterizing potentially safety critical situations for vessels with a properly configured AIS transponder. The traditional approach of studying (near) collision situations, is through vessel conflict zones, based on vessel location and speed from low resolution AIS data. Our approach utilizes the rate of turn parameter in the AIS signal, at maximum time resolution. From collision investigation reports it is often seen that prior to or at collision navigators perform frenetic rudder actions in the hope to avoid collision in the last second. These hard maneuverings are easily spotted as non-normal rate of turn signals. An identified potential critical situation may then be further characterized by the occurring centripetal acceleration a vessel is exposed to. We demonstrate the novelty of our methodology in a case study of a real ship collision. As the rate of turn parameter is directly linkable to the navigator behavior it provides information about when and to what degree actions were taken. We believe our work will therefore inspire new research on safety and human factors as a risk profiles could be derived based on AIS data.
Źródło:
TransNav : International Journal on Marine Navigation and Safety of Sea Transportation; 2016, 10, 1; 69-77
2083-6473
2083-6481
Pojawia się w:
TransNav : International Journal on Marine Navigation and Safety of Sea Transportation
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Using the ARP-03 for high-resolution mapping of calcic horizons
Autorzy:
Priori, S.
Fantappie, M.
Magini, S.
Costantini, E.A.C.
Powiązania:
https://bibliotekanauki.pl/articles/24650.pdf
Data publikacji:
2013
Wydawca:
Polska Akademia Nauk. Instytut Agrofizyki PAN
Opis:
The aim of this work is to present a fast and cheap method for high-resolutionmapping of calcic horizons in vineyards based on geoelectrical proximal sensing. The study area, 45 ha located in southern Sicily (Italy), was characterized by an old, partially dismantled marine terrace and soils with a calcic horizon at different depths. The geoelectrical investigation consisted of a survey of the soil electrical resistivity recorded with the Automatic Resistivity Profiling-03 sensor. The electrical resistivity values at three pseudo-depths, 0-50, 0-100 and 0-170 cm, were spatialized by means of ordinary kriging. A principal component analysis of the three electrical resistivity maps was carried out. During the survey, 18 boreholes, located at different electrical resistivity values, were made for soil description and sampling. The depth to the calcic horizon showed a strong correlation with electrical resistivity. The regression model between calcic horizon and the principal component analysis factors with the highest correlation coefficients was selected to spatialise the calcic horizon values. An Normalized Difference Vegetation Index map was used to validate the calcic horizon map in terms of crop response to different soil rooting depths. The strengths of this method are the quick, non-invasive kind of survey, the relevance for vine vigour, and the high spatial resolution of the final map.
Źródło:
International Agrophysics; 2013, 27, 3
0236-8722
Pojawia się w:
International Agrophysics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Examples of object-oriented classification performed on high-resolution satellite images
Autorzy:
Lewiński, Stanisław
Zaremski, Karol
Kwiatkowska, Joanna M.
Powiązania:
https://bibliotekanauki.pl/articles/2029415.pdf
Data publikacji:
2004-06-01
Wydawca:
Uniwersytet Warszawski. Wydział Geografii i Studiów Regionalnych
Tematy:
object-oriented classification
land use
satellite images
eCognition
Opis:
Information about the types of land cover and its use is obtained by the visual interpretation of the color composite of satellite images or by the use of automatic classification algorithms. For obvious reasons, the automatic classification methods make it possible to obtain information quicker and much faster than the traditional interpretation method. The commonly used automatic methods of satellite image classification, based on supervised or unsupervised classification algorithms, are the most accurate when used with low resolution images. In the case of images with 1-meter-sized pixels, showing a diversity of land cover forms, it is not possible to obtain satisfactory results. New classification techniques, based on object-oriented classification algorithms, have been developing for a couple of years now. In contrast to the traditional methods, the new operating procedure does not involve the classification of single pixels, but of entire objects, into which the content of the satellite image is divided. Aside from the spectral values of the pixels, the shape of the objects created by the pixels and the relationships between the objects, are also considered during the analysis. Similar to visual interpretation, variation in the texture of the image can also be taken into account in this case. The aim of this article is to present the possibility of using high density satellite images in object-oriented classification. The classification presented is that of a high-rise built area in Wrocław and of bridges on the Vistula River in Warsaw.
Źródło:
Miscellanea Geographica. Regional Studies on Development; 2004, 11; 349-358
0867-6046
2084-6118
Pojawia się w:
Miscellanea Geographica. Regional Studies on Development
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Image acquisition system based on synchronized high-resolution gigabit ethernet cameras
Autorzy:
Włodarczyk, M.
Kacperski, D.
Płuciennik, T.
Grabowski, K.
Powiązania:
https://bibliotekanauki.pl/articles/305720.pdf
Data publikacji:
2017
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
image acquisition
cameras synchronized with illumination
biometrics
face recognition
Opis:
Over the past few years, a huge increase in the number of various computer vision applications can be observed. These are widely used in such areas as video surveillance, medical diagnostics, biometrics recognition, and the automotive and military industries. Most of these solutions take advantage of high-resolution cameras in order to obtain high-quality images. Surprisingly, little attention is paid in the literature to the practical implementation of off- the-shelf image acquisition systems. Most of the available solutions are composed of custom-developed electronic devices that use specialized multi-core DSPs and/or FPGA technology. Therefore, a novel realization of a scalable and comprehensive image acquisition system based on synchronized high-resolution Gigabit Ethernet cameras is presented in this paper. The proposed solution allows for the connection of multiple cameras along with any number of external illumination modules. The selected devices can be synchronized with each other in user-defined configurations; hence, a designed solution can be easily integrated in both simple and complex applications. The authors describe the design and implementation processes of the proposed platform in detail. The performance issues that can occur in such systems are presented and discussed. The obtained results are encouraging and useful for the development of similar solutions.
Źródło:
Computer Science; 2017, 18 (2); 179-194
1508-2806
2300-7036
Pojawia się w:
Computer Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Korekcja geometryczna wysokorozdzielczych obrazów satelitarnych
Geometric correction of high-resolution satellite imagery
Autorzy:
Borowiec, N.
Powiązania:
https://bibliotekanauki.pl/articles/262424.pdf
Data publikacji:
2006
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
wysokorozdzielcze obrazy satelitarne
model wielomianów ilorazowych
high-resolution satellite imagery
Rational Function Model
RFM
Opis:
Artykuł jest opracowaniem syntetycznym dotyczącym korekcji geometrycznej wysokorozdzielczych obrazów satelitarnych. W ostatnich latach nastąpił dynamiczny rozwój systemów satelitarnych umożliwiających rejestrację obrazów o wysokiej rozdzielczości, poniżej 1 m. Mankamentem tego rodzaju zobrazowań jest niska dokładność pomiarowa, która wymaga etapu wstępnego przetworzenia obrazów - tzw. korekcji geometrycznej. Podstawą korekcji geometrycznej jest określenie matematycznego związku między współrzędnymi terenowymi punktów a współrzędnymi tłowymi. Początkowo korekcje były przeprowadzone w oparciu o modele typu 2D. Modele te posiadają jednak istotne wady, związane z wymaganą dużą liczbą punktów dostosowania, czułością na nierównomierny rozkład tych punktów oraz niestabilnością numeryczną. W związku z tym w ostatnim czasie pojawiły się próby rozwiązania problemu korekcji geometrycznej, z wykorzystaniem metody wielomianu ilorazowego (RFM). Opracowany artykuł przedstawia podstawy teoretyczne modelu wielomianowego RFM, szczegółowy opis metod określenia współczynników takiego wielomianu oraz praktyczne wyniki korygowania obrazów satelitarnych przy wykorzystaniu dwóch metod korekcji - metody bezpośredniej i pośredniej. Analiza wyników empirycznych ujawnia wysoką dokładność korekcji geometrycznej metodą wielomianów ilorazowych.
This paper is a comparative study of the geometrical correction of high-resolution satellite imagery. In the last few years, the dynamic development system of satellites has made the registration of high resolution imagery below 1m. possible. However, these low accuracy images require geometrical correction. Geometrical correction is basically a mathematical relationship between object point coordinates and image pixel coordinates. Initially, corrections used to be made using 2D polynomial models. These models were defected as they required a large number of ground control points, sensitivity onto irregular distribution of these points and numerical instability. In addition, in last time appear solution problems of geometrical correction with utilization of rational function model. This article introduces the theoretical basis of the rational function model. It gives a detailed description of methods used to specify polynomial coefficients as well as the practical results obtained when correcting satellite images using the two methods of correction - the direct and indirect method. Analysis of empirical results indicate that the geometrical correction method of the rational function model is much more accurate.
Źródło:
Geodezja / Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie; 2006, 12, 1; 31-42
1234-6608
Pojawia się w:
Geodezja / Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-25 z 197

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