Littérature scientifique sur le sujet « Filtre spatial »
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Articles de revues sur le sujet "Filtre spatial"
GOBERT, J., J. F. DEROUBAIX et M. SEIDL. « Un filtre planté dans le bois de Boulogne : quelle intégration socio-spatiale d’un objet-frontière ? » Techniques Sciences Méthodes 12 (20 janvier 2023) : 55–72. http://dx.doi.org/10.36904/202212055.
Texte intégralXin He, Xin He, Jian Zhou Jian Zhou, Xiaoming Nie Xiaoming Nie et Xingwu Long Xingwu Long. « Filtering characteristics of spatial filter for spatial filtering velocimeter ». Chinese Optics Letters 13, no 6 (2015) : 060702–60705. http://dx.doi.org/10.3788/col201513.060702.
Texte intégralSivakumar, R., M. K. Gayathri et D. Nedumaran. « Speckle Filtering of Ultrasound B-Scan Images- A Comparative Study of Single Scale Spatial Adaptive Filters, Multiscale Filter and Diffusion Filters ». International Journal of Engineering and Technology 2, no 6 (2010) : 514–23. http://dx.doi.org/10.7763/ijet.2010.v2.174.
Texte intégralYing Zhang, Ying Zhang, Hongji Qi Hongji Qi, Kui Yi Kui Yi, Yanzhi Wang Yanzhi Wang, Hongbo He Hongbo He et Jianda Shao Jianda Shao. « Design and fabrication of thin-film spatial filter ». Chinese Optics Letters 12, s2 (2014) : S20501–320504. http://dx.doi.org/10.3788/col201412.s20501.
Texte intégralDev, Ashwani, et George A. McMechan. « Spatial antialias filtering in the slowness-frequency domain ». GEOPHYSICS 74, no 2 (mars 2009) : V35—V42. http://dx.doi.org/10.1190/1.3052115.
Texte intégralCantet, Philippe, M. A. Boucher, S. Lachance-Coutier, R. Turcotte et V. Fortin. « Using a Particle Filter to Estimate the Spatial Distribution of the Snowpack Water Equivalent ». Journal of Hydrometeorology 20, no 4 (29 mars 2019) : 577–94. http://dx.doi.org/10.1175/jhm-d-18-0140.1.
Texte intégralKim, J. S. « Mitigation of Inter-Symbol Interference in Underwater Acoustic Communication Using Spatial Filter ». Journal Of The Acoustical Society Of Korea 33, no 1 (2014) : 48. http://dx.doi.org/10.7776/ask.2014.33.1.048.
Texte intégralHariharan, P., et M. Roy. « Improved pinhole spatial filter ». Optics & ; Laser Technology 39, no 1 (février 2007) : 155–56. http://dx.doi.org/10.1016/j.optlastec.2005.04.002.
Texte intégralDonohoe, Aaron, et David S. Battisti. « The Amplitude Asymmetry between Synoptic Cyclones and Anticyclones : Implications for Filtering Methods in Feature Tracking ». Monthly Weather Review 137, no 11 (1 novembre 2009) : 3874–87. http://dx.doi.org/10.1175/2009mwr2837.1.
Texte intégralZhou, Hau‐wei. « Traveltime tomography with a spatial‐coherency filter ». GEOPHYSICS 58, no 5 (mai 1993) : 720–26. http://dx.doi.org/10.1190/1.1443456.
Texte intégralThèses sur le sujet "Filtre spatial"
Guerrero, Enriquez Rubén Dario. « Etude des filtres miniatures LTCC High K en bandes L&S ». Thesis, Brest, 2016. http://www.theses.fr/2016BRES0036/document.
Texte intégralIn current communication systems, whether terrestrial or spatial, whether fixed or mobile, there is a real interest in developing high performance miniature RF front-ends. This is applied in particular to filter devices, in which the size and the quality factors are clearly in conflict. For low frequency bands around the GHz, the wavelengths remain significant, making it difficult the miniaturization efforts. On the other hand, we must also ensure that these filters will be easily interconnected with other other system components, including active devices.For all these reasons, the development of multilayer filter structures using high permittivity substrates (Er = 68) in an LTCC approach is consolidated as an interesting alternative. It may lead to a significant footprint reduction without decreasing the electrical performances.As part of this work, two multilayer filter structures have been developed to meet the given specifications in L and S bands, given by a space manufacturer. These filters have as main features a high rejection level and low losses in the passband. To meet the specifications, a vertically stacked SIW filter and a short-circuited stubs filter in a stripline configuration were studied. The SIW filter is characterized by a high quality factor, which results in low insertion loss and good flatness. The stubs filter allows in contrast to reduce the footprint but at the price of impacting the electrical performance. In both cases we take advantage of the flexibility offered by the LTCC technology as it finally provides an additional freedom degree compared to a conventional planar approach. For the SIW filter, the topological architecture was studied and designed in detail, to be able to arrange and synthetize couplings between twelve cavities. In a similar way, for the stub filter a synthesis that takes profit of all the offered freedom degrees was developed.Given the filters complexity, especially due to the high order and the implementation of “electrical walls" based on specific vias patterns, a close attention must be paid during the simulation and optimization phase. In addition, the high permittivity substrate does not allow to conceive 50-Ohms lines. Finally, access transitions constitute a challenging task, especially for the SIW case.This thesis was co-funded by CNES (Centre National d'Etudes Spatiales) and Thales Alenia Space, and was accompanied by an R&T project funded by CNES. The German foundry Via Electronic was responsible for the filters fabrication
Renaud, Denis. « Caractérisation du propulseur PEGASES : diagnostics du filtre magnétique et du faisceau : optimisation de la géométrie ». Thesis, Orléans, 2016. http://www.theses.fr/2016ORLE2018/document.
Texte intégralThe PEGASES ion thruster differs from standard electric propulsion technologies through its use of electronegative gases, such as SF₆, as a propellant. Its operation relies on the trapping of electrons using a magnetic field and the creation of a plasma dominated by positive and negative ions. These ions are alternately accelerated to produce thrust, and later undergo a recombination to ensure beam neutrality. This thruster eliminates the need for an electron-producing neutralizer, which is a standard feature in other sources such as the Hall thruster. This thesis is divided into three parts. The first describes the development and implementation of a new EXB probe for the study of the ion beam properties, the identification of the beam chemical composition and the verification of the presence of negative and positive ion species. The second part concerns the design and application of a new laser photodetachment diagnostic for the measurement of the negative ion fraction. Lastly, a new ion-ion thruster with a circular geometry, known as AIPE, has been designed, constructed and successfully tested. This prototype eliminates the plasma asymmetry present in PEGASES and reveals the importance of the magnetic filter to source operation
Edjeou, René Tchalim. « Contribution à la réalisation d'un dispositif à transport acoustique de charges ». Valenciennes, 1999. https://ged.uphf.fr/nuxeo/site/esupversions/f6344825-6189-4bcd-a9c7-83534f301ffe.
Texte intégralHecquet, Christophe. « Conception, réalisation et métrologie de miroirs multicouches pour l'extrême ultraviolet résistants aux environnements du spatial et des sources EUV ». Phd thesis, Université Paris Sud - Paris XI, 2009. http://tel.archives-ouvertes.fr/tel-00387144.
Texte intégralLes travaux présentés portent sur la conception, la réalisation et la métrologie de miroirs multicouches périodiques. La motivation principale de cette étude est de mettre en place un cycle de développement prenant en compte à la fois les propriétés optiques du pouvoir réflecteur des revêtements réfléchissants (réflectivité, sélectivité spectrale, atténuation) mais aussi l'environnement d'utilisation des optiques.
Afin d'améliorer les propriétés de sélectivité spectrale, de nouvelles structures multicouches périodiques ont été développées. Elles se caractérisent par un pouvoir réflecteur qui réfléchit bien deux régions spectrales ajustables et introduit des atténuations paramétrables.
L'effet de l'environnement sur la stabilité des performances est particulièrement critique pour les optiques de collection. L'ajout de matériaux barrières a permis de stabiliser les performances du pic de réflectivité pendant plus de 200 h à 400°C et de réduire l'influence des autres facteurs d'instabilité sur le pouvoir réflecteur.
De plus, toutes les structures réalisées ont été évaluées avec succès en environnements climatiques sévères.
Möller, Torsten. « Spatial domain filter design / ». The Ohio State University, 1999. http://rave.ohiolink.edu/etdc/view?acc_num=osu1488190109868038.
Texte intégralBarufi, Ana Maria Bonomi. « Dimensões regionais da mortalidade infantil no Brasil ». Universidade de São Paulo, 2010. http://www.teses.usp.br/teses/disponiveis/12/12140/tde-26022010-093526/.
Texte intégralDevelopment can be understood from many perspectives. Among those, the one proposed by Amartya Sen states that a development policy should aim at expanding the freedom of individuals, and this goal can be achieved by the expansion of capabilities. With this conceptual framework in mind, health, more specifically infant mortality, is chosen as a measure of development and as the object of study. The Government should guarantee the provision of health services, as they consist in meritory goods. Mosley and Chen (1984) propose a theoretical framework to study infant mortality based on the proximal determinants, in which the socioeconomic factors affect the result observed indirectly. In Brazil there has been a substantial reduction of the average levels of infant mortality rates in the last decades. However, there is still a significant regional inequality. Econometric models for 1980, 1991 and 2000 are estimated including a spatial filter in order to account for the spatial dependency observed in the data. The study concludes that health infrastructure lost its explanative power for the differences in infant mortality rate among the localities. On the other hand, socioeconomic variables have become more relevant and significant. It means that future public policies must try to improve the access of the families to public facilities, reduce poverty and inequality and improve educational levels. Therefore, the family-based prevention against health problems should be stimulated, helping to avoid premature death
Feuray, William. « Multiplexeurs Accordables pour Application Spatiale ». Thesis, Limoges, 2017. http://www.theses.fr/2017LIMO0115/document.
Texte intégralThis thesis is about study of tunable output multiplexer principle for telecommunication satellite payload. The first step is analysis of the main topologies of output multiplexers and to compare them to conclude with the best candidate. Then, several studies were conducted on 3D plastic printed passive components with specific metallizations, searching how to improve results in term of losses and precision. Last part detailed two channels multiplexer design which can be used on three different states of relative bandwidth from 1.6 to 4.8 % at 19 GHz, and realization of two concept proof prototypes (one in metallized 3D printed plastic and another one in machined aluminum)
Jolly, Nicolas. « Filtres accordables volumiques à forts facteurs de qualité pour des applications spatiales ». Thesis, Limoges, 2015. http://www.theses.fr/2015LIMO0103/document.
Texte intégralAt a time when the amount of information and the number of users go through the roof in telecommunication market, the telecommunication systems tend to improve the management of their capacity by moving toward reconfigurable RF devices. However frequency and bandwidth allocated are still restricted. Regarding tunable OMUX filters, the actuation systems generally degrade the overall performances of the device and raise questions in terms of mechanic and thermic.We first demonstrated the feasability of a two state filter with constant narrowband, using a dielectric material (alumina) in rotation inside a metallic housing. Then, we suggested solutions to control both frequency and bandwidth with the translation of a ceramics. We deal with quality factor in the range of ten of thousands for these applications. Eventually, we validated some principle for tunable filters thanks to the efficiency of 3D plastic printer
Gorea, Andrei. « Le codage visuel des constituants "elementaires" de l'image : approche psychophysique ». Paris 6, 1986. http://www.theses.fr/1986PA066473.
Texte intégralHamidouche, Louiza. « Spectroscopie micro-onde pour la mesure des charges d'espace à haute résolution spatiale dans les isolants en couche mince ». Electronic Thesis or Diss., Sorbonne université, 2018. http://www.theses.fr/2018SORUS275.
Texte intégralThe objective of this thesis is to come up with and test a new method for the measurement of space charge in very thin insulating films with a high spatial resolution. The proposed method is called Electro-Acoustic Reflectometry (EAR) method. The EAR method relies on the electro-elastic coupling of the sample under test. Both excitation and measurement are of electrical nature and are performed in frequency domain. A microwave setup is used for high frequency measurements. The measurement principle is the generation of ultasonic waves when space charge undergoes an applied electrical field. The energy that is used up in the generation of these waves leaves a feature in the reflection of the electrical excitation. It is this feature that is used to find the space charge distribution by a simple inverse Fourier transform. A measurement setup comprising a vector network analyser, a dedicated sample holder and an acquistion interface allows to test the EAR method. The obtained results are promising. A bulk spatial resolution of 1.2µm has been demonstrated. It exceeds the current best spatial resolution achieved by existing conventionnal ultrasonic methods by a factor of about 10. To further enhance the spatiale resolution of the EAR method, it is necessary to broaden the measurement frequency range. An approach to deal with the problems occuring at high frequnecy is proposed
Livres sur le sujet "Filtre spatial"
T, Smith Mark J., et United States. National Aeronautics and Space Administration., dir. Spatially-varying IIR filter banks for image coding. [Washington, DC : National Aeronautics and Space Administration, 1992.
Trouver le texte intégralT, Smith Mark J., et United States. National Aeronautics and Space Administration., dir. Spatially-varying IIR filter banks for image coding. [Washington, DC : National Aeronautics and Space Administration, 1992.
Trouver le texte intégralT, Smith Mark J., et United States. National Aeronautics and Space Administration., dir. Spatially-varying IIR filter banks for image coding. [Washington, DC : National Aeronautics and Space Administration, 1992.
Trouver le texte intégralGriffith, Daniel A. Spatial regression analysis on the PC : Spatial statistics using SAS. Washington, D.C : Association of American Geographers, 1993.
Trouver le texte intégralGriffith, Daniel A. Spatial regression analysis on the PC : Spatial statistics using Minitab. [Ann Arbor, Mich., U.S.A.] (2790 Briarcliff, Ann Arbor 48105) : Institute of Mathematical Geography, 1989.
Trouver le texte intégralDecker, Arthur J. Neural-network-directed alignment of optical systems using the laser-beam spatial filter as an example. Cleveland, Ohio : Lewis Research Center, 1993.
Trouver le texte intégralJ, Krasowski Michael, Weiland Kenneth E et United States. National Aeronautics and Space Administration. Scientific and Technical Information Program., dir. Neural-network directed alignment of optical systems using the laser-beam spatial filter as an example. [Washington, DC] : National Aeronautics and Space Administration, Office of Management, Scientific and Technical Information Program, 1993.
Trouver le texte intégralJ, Krasowski Michael, Weiland Kenneth E et United States. National Aeronautics and Space Administration. Scientific and Technical Information Program., dir. Neural-network directed alignment of optical systems using the laser-beam spatial filter as an example. [Washington, DC] : National Aeronautics and Space Administration, Office of Management, Scientific and Technical Information Program, 1993.
Trouver le texte intégralJ, Krasowski Michael, Weiland Kenneth E et United States. National Aeronautics and Space Administration. Scientific and Technical Information Program., dir. Neural-network directed alignment of optical systems using the laser-beam spatial filter as an example. [Washington, DC] : National Aeronautics and Space Administration, Office of Management, Scientific and Technical Information Program, 1993.
Trouver le texte intégralP, Kaluzny S., dir. S+SpatialStats : User's manual for Windows and UNIX. New York : Springer, 1998.
Trouver le texte intégralChapitres de livres sur le sujet "Filtre spatial"
Chityala, Ravishankar, et Sridevi Pudipeddi. « Spatial Filters ». Dans Image Processing and Acquisition using Python, 61–93. Second edition. | Boca Raton : Chapman & Hall/CRC Press, 2020. | Series : Chapman & Hall/CRC the Python series : Chapman and Hall/CRC, 2020. http://dx.doi.org/10.1201/9780429243370-4.
Texte intégralBacher, C. « Ecosystem Modelling : Sensitivity of Physical Characteristics to Spatial Box Design ». Dans Bivalve Filter Feeders, 517–18. Berlin, Heidelberg : Springer Berlin Heidelberg, 1993. http://dx.doi.org/10.1007/978-3-642-78353-1_17.
Texte intégralLi, Xuan, et Haixian Wang. « Smooth Spatial Filter for Common Spatial Patterns ». Dans Neural Information Processing, 315–22. Berlin, Heidelberg : Springer Berlin Heidelberg, 2013. http://dx.doi.org/10.1007/978-3-642-42042-9_40.
Texte intégralGriffith, Daniel A., et Jean H. P. Paelinck. « Spatial Filter Versus Conventional Spatial Model Specifications : Some Comparisons ». Dans Non-standard Spatial Statistics and Spatial Econometrics, 117–49. Berlin, Heidelberg : Springer Berlin Heidelberg, 2010. http://dx.doi.org/10.1007/978-3-642-16043-1_7.
Texte intégralNewell, Carter R., et Sandra E. Shumway. « Grazing of Natural Particulates by Bivalve Molluscs : A Spatial and Temporal Perspective ». Dans Bivalve Filter Feeders, 85–148. Berlin, Heidelberg : Springer Berlin Heidelberg, 1993. http://dx.doi.org/10.1007/978-3-642-78353-1_4.
Texte intégralBattisti, Michele, et Gianfranco Di Vaio. « A spatially filtered mixture of β-convergence regressions for EU regions, 1980–2002 ». Dans Spatial Econometrics, 105–21. Heidelberg : Physica-Verlag HD, 2009. http://dx.doi.org/10.1007/978-3-7908-2070-6_6.
Texte intégralTang, Fuhui, Xiankai Lu, Xiaoyu Zhang, Xueqian Song, Jiyuan Cai, Hong Zhang et Jiaru Song. « Spatial Context for Correlation Filter Tracking ». Dans Advances in Intelligent Systems and Computing, 174–81. Cham : Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-98776-7_20.
Texte intégralEsperança, Claudio, et Hanan Samet. « Orthogonal polygons as bounding structures in filter-refine query processing strategies ». Dans Advances in Spatial Databases, 197–220. Berlin, Heidelberg : Springer Berlin Heidelberg, 1997. http://dx.doi.org/10.1007/3-540-63238-7_31.
Texte intégralWohlleben, R., H. Mattes et Th Krichbaum. « Theory of Linear Spatial Filters ». Dans Interferometry in Radioastronomy and Radar Techniques, 18–24. Dordrecht : Springer Netherlands, 1991. http://dx.doi.org/10.1007/978-94-011-3702-7_5.
Texte intégralUmbaugh, Scott E. « Transform Filters, Spatial Filters and the Wavelet Transform ». Dans Digital Image Processing and Analysis, 175–210. 4e éd. Boca Raton : CRC Press, 2022. http://dx.doi.org/10.1201/9781003221142-5.
Texte intégralActes de conférences sur le sujet "Filtre spatial"
Flannery, David, John Loomis et Mary Milkovitch. « The Use of Binary Magneto-optic Spatial Light Modulators in Pattern Recognition Processors ». Dans Spatial Light Modulators and Applications. Washington, D.C. : Optica Publishing Group, 1988. http://dx.doi.org/10.1364/slma.1988.fa4.
Texte intégralChumside, James H., Steen G. Hanson et Steven F. Clifford. « Optical Remote Sensing of Wind and Turbulence using Double Spatial Filtering of Scintillations ». Dans Optical Remote Sensing of the Atmosphere. Washington, D.C. : Optica Publishing Group, 1990. http://dx.doi.org/10.1364/orsa.1990.wd2.
Texte intégralSolomon, J. A., et D. G. Pelli. « Spatial-frequency channels process text ». Dans OSA Annual Meeting. Washington, D.C. : Optica Publishing Group, 1993. http://dx.doi.org/10.1364/oam.1993.wr.25.
Texte intégralJavidi, B., et S. F. Odeh. « Real-time Object Recognition and Classification by Code Division Multiplexed Phase-only Encoded Filters ». Dans Spatial Light Modulators and Applications. Washington, D.C. : Optica Publishing Group, 1988. http://dx.doi.org/10.1364/slma.1988.the13.
Texte intégralDowski, Edward R., et W. Thomas Cathey. « Modern wavefront-based optical anti-aliasing filter ». Dans International Optical Design Conference. Washington, D.C. : Optica Publishing Group, 1998. http://dx.doi.org/10.1364/iodc.1998.lfb.4.
Texte intégralDickey, F. M., B. V. K. Vijaya Kumar, L. A. Romero et J. M. Connelly. « Complex ternary matched filters yielding high signal-to-noise ratios ». Dans OSA Annual Meeting. Washington, D.C. : Optica Publishing Group, 1989. http://dx.doi.org/10.1364/oam.1989.mff6.
Texte intégralHosokawa, Shigeo, Hiroki Sakamoto et Akio Tomiyama. « Spatial Filter Velocimetry Based on Time-Series Particle Images ». Dans ASME-JSME-KSME 2011 Joint Fluids Engineering Conference. ASMEDC, 2011. http://dx.doi.org/10.1115/ajk2011-31005.
Texte intégralMayers, A. W., F. T. S. Yu, S. Rajan, S. Wu et D. A. Gregory. « Colored matched spatial filters recorded in LiNbO3 ». Dans OSA Annual Meeting. Washington, D.C. : Optica Publishing Group, 1991. http://dx.doi.org/10.1364/oam.1991.thkk1.
Texte intégralBen-Haim, J., et J. Shamir. « Shift, rotation, and scale invariant pattern recognition by bipolar spatial filtering ». Dans OSA Annual Meeting. Washington, D.C. : Optica Publishing Group, 1986. http://dx.doi.org/10.1364/oam.1986.the3.
Texte intégralTown, Graham E. « Application of digital-filter theory to the design of grating filters ». Dans OSA Annual Meeting. Washington, D.C. : Optica Publishing Group, 1993. http://dx.doi.org/10.1364/oam.1993.thvv.3.
Texte intégralRapports d'organisations sur le sujet "Filtre spatial"
Kallman, Robert R. Optical Spatial Filter Development. Fort Belvoir, VA : Defense Technical Information Center, juin 1995. http://dx.doi.org/10.21236/ada301435.
Texte intégralMansour, N. A. Computer realization of spatial filters. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 1986. http://dx.doi.org/10.4095/304876.
Texte intégralKovalenkov, A. N., S. M. Semchenkov et M. S. Makarov. Spatial inverse filtering method based on a controlled structure filter. OFERNIO, novembre 2020. http://dx.doi.org/10.12731/ofernio.2020.24671.
Texte intégralWilliams, J., T. Beavers, S. Bryan, G. Hermes et H. Patton. NIF Inert Gas/Vacuum Management Prestart Review Phase 3 - Permit Spatial Filter Vacuum. Office of Scientific and Technical Information (OSTI), mars 2001. http://dx.doi.org/10.2172/15013286.
Texte intégralHerman, Martin, et Rama Chellappa. A general motion model and spatio-temporal filters for computing optical flow. Gaithersburg, MD : National Institute of Standards and Technology, 1994. http://dx.doi.org/10.6028/nist.ir.5539.
Texte intégralBeal, Samuel, et Matthew Bigl. Particle size characteristics of energetic materials distributed from low-order functioning mortar munitions. Engineer Research and Development Center (U.S.), août 2024. http://dx.doi.org/10.21079/11681/49189.
Texte intégralLiu, Hongche. A general motion model and spatio-temporal filters for 3-D motion interpretations. Gaithersburg, MD : National Institute of Standards and Technology, 1995. http://dx.doi.org/10.6028/nist.ir.5763.
Texte intégralSinclair, Samantha, et Sally Shoop. Automated detection of austere entry landing zones : a “GRAIL Tools” validation assessment. Engineer Research and Development Center (U.S.), août 2022. http://dx.doi.org/10.21079/11681/45265.
Texte intégralFarahbod, A., et J. F. Cassidy. Spatial and temporal variations in seismic coda Q attenuation in the lower St. Lawrence region, southeastern Quebec. Natural Resources Canada/CMSS/Information Management, 2023. http://dx.doi.org/10.4095/332027.
Texte intégralLamontagne, M. Macroseismic information for the 1935 moment magnitude 6.1 earthquake, near Témiscamingue, Quebec. Natural Resources Canada/CMSS/Information Management, 2021. http://dx.doi.org/10.4095/329136.
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