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Letteratura scientifica selezionata sul tema "GUIDED FILTERS"

Autore: Grafiati

Pubblicato: 26 ottobre 2023

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Articoli di riviste sul tema "GUIDED FILTERS"

Vizilter, Y. V., A. Y. Rubis e S. Y. Zheltov. "CHANGE DETECTION VIA SELECTIVE GUIDED CONTRASTING FILTERS". ISPRS - International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences XLII-1/W1 (31 maggio 2017): 403–10. http://dx.doi.org/10.5194/isprs-archives-xlii-1-w1-403-2017.

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Change detection scheme based on guided contrasting was previously proposed. Guided contrasting filter takes two images (test and sample) as input and forms the output as filtered version of test image. Such filter preserves the similar details and smooths the non-similar details of test image with respect to sample image. Due to this the difference between test image and its filtered version (difference map) could be a basis for robust change detection. Guided contrasting is performed in two steps: at the first step some smoothing operator (SO) is applied for elimination of test image details; at the second step all matched details are restored with local contrast proportional to the value of some local similarity coefficient (LSC). The guided contrasting filter was proposed based on local average smoothing as SO and local linear correlation as LSC. In this paper we propose and implement new set of selective guided contrasting filters based on different combinations of various SO and thresholded LSC. Linear average and Gaussian smoothing, nonlinear median filtering, morphological opening and closing are considered as SO. Local linear correlation coefficient, morphological correlation coefficient (MCC), mutual information, mean square MCC and geometrical correlation coefficients are applied as LSC. Thresholding of LSC allows operating with non-normalized LSC and enhancing the selective properties of guided contrasting filters: details are either totally recovered or not recovered at all after the smoothing. These different guided contrasting filters are tested as a part of previously proposed change detection pipeline, which contains following stages: guided contrasting filtering on image pyramid, calculation of difference map, binarization, extraction of change proposals and testing change proposals using local MCC. Experiments on real and simulated image bases demonstrate the applicability of all proposed selective guided contrasting filters. All implemented filters provide the robustness relative to weak geometrical discrepancy of compared images. Selective guided contrasting based on morphological opening/closing and thresholded morphological correlation demonstrates the best change detection result.

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Toet, Alexander. "Alternating guided image filtering". PeerJ Computer Science 2 (27 giugno 2016): e72. http://dx.doi.org/10.7717/peerj-cs.72.

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Edge preserving filters aim to simplify the representation of images (e.g., by reducing noise or eliminating irrelevant detail) while preserving their most significant edges. These filters are typically nonlinear and locally smooth the image structure while minimizing both blurring and over-sharpening of visually important edges. Here we present the Alternating Guided Filter (AGF) that achieves edge preserving smoothing by combining two recently introduced filters: the Rolling Guided Filter (RGF) and the Smooth and iteratively Restore Filter (SiR). We show that the integration of RGF and SiR in an alternating iterative framework results in a new smoothing operator that preserves significant image edges while effectively eliminating small scale details. The AGF combines the large scale edge and local intensity preserving properties of the RGF with the edge restoring properties of the SiR while eliminating the drawbacks of both previous methods (i.e., edge curvature smoothing by RGF and local intensity reduction and restoration of small scale details near large scale edges by SiR). The AGF is simple to implement and efficient, and produces high-quality results. We demonstrate the effectiveness of AGF on a variety of images, and provide a public code to facilitate future studies.

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Wu, Wenze, Leonard Weber, Finn-Niclas Stapelfeldt, Peter Hinze, Thomas Weimann, Bernd Bodermann, Stefanie Kroker, Joan Daniel Prades, Hutomo Suryo Wasisto e Andreas Waag. "Pixel-Wise Multispectral Sensing System Using Nanostructured Filter Matrix for Biomedical Applications". Proceedings 2, n. 13 (29 novembre 2018): 880. http://dx.doi.org/10.3390/proceedings2130880.

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In this work, a novel multispectral sensing system consisting of nanostructured filter matrix and a charge-coupled device (CCD)-based image sensor has been developed to overcome the limitation of the conventional pigment filtered sensors, which are difficult to be fabricated at a microscale and usually showing a pronounced degradation. By designing the filters in guided-mode resonance (GMR) architecture, light transmission efficiencies of ~90% with low sidebands and sharp peaks can be obtained, which are critical characteristics for realizing precise optical measurement systems. To optimize the transmission functions, various materials and structural parameters have been simulated. Electron beam nanolithography is employed in the device fabrication to fabricate pixel-wise independent filter functions. After being characterized in terms of their wavelength filtering capability, the developed GMR filters are then combined with image sensors, particularly for addressing biological applications.

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Roth, Zachary A., Pradeep Srinivasan, Menelaos K. Poutous, Aaron J. Pung, Raymond C. Rumpf e Eric G. Johnson. "Azimuthally Varying Guided Mode Resonance Filters". Micromachines 3, n. 1 (15 marzo 2012): 180–93. http://dx.doi.org/10.3390/mi3010180.

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Magnusson, R., e S. S. Wang. "Transmission bandpass guided-mode resonance filters". Applied Optics 34, n. 35 (10 dicembre 1995): 8106. http://dx.doi.org/10.1364/ao.34.008106.

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Mousa, Mohamed A., Nadia H. Rafat e Amr A. E. Saleh. "Toward spectrometerless instant Raman identification with tailored metasurfaces-powered guided-mode resonances (GMR) filters". Nanophotonics 10, n. 18 (20 ottobre 2021): 4567–77. http://dx.doi.org/10.1515/nanoph-2021-0444.

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Abstract Raman identification is an instrumental tool with a broad range of applications, yet current spectroscopy approaches fall short in facilitating practical and scalable Raman identification platforms. In this work, we introduce a spectrometerless Raman identification approach that utilizes guided-mode resonance filters. Unlike arrayed narrowband-filters spectrometer, we tailor the transmission characteristics of each filter to match the Raman signature of a given target. Hence, instantaneous Raman identification could be directly achieved at the hardware level with no spectral data post-processing. The filters consist of a metasurface grating encapsulated between two identical distributed Bragg reflectors and are characterized by transmission peaks line-widths narrower than 0.01 nm and transmission efficiency exceeding 98%. We develop a rigorous design methodology to customize the filters’ characteristics such that the maximum optical transmission through a given filter is only attained when exposed to the Raman scattering from its matched target. To illustrate the potential of our approach, we theoretically investigate the identification of four different saccharides as well as the classification of two antibiotic-susceptible and resistant strains of Staphylococcus aureus. We show that our proposed approach can accurately identify these targets. Our work lays the foundation for a new-generation of scalable, compact, and cost-effective instant Raman identification platforms that can be adopted in countless applications from wearables and point-of-care diagnostics to in-line quality control in food and pharmaceutical industries.

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Uddin, Mohammad Jalal, e Robert Magnusson. "Efficient Guided-Mode-Resonant Tunable Color Filters". IEEE Photonics Technology Letters 24, n. 17 (settembre 2012): 1552–54. http://dx.doi.org/10.1109/lpt.2012.2208453.

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Vallius, Tuomas, Pasi Vahimaa e Jari Turunen. "Pulse deformations at guided-mode resonance filters". Optics Express 10, n. 16 (12 agosto 2002): 840. http://dx.doi.org/10.1364/oe.10.000840.

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Liu, Wenxing, Zhenquan Lai, Hao Guo e Ying Liu. "Guided-mode resonance filters with shallow grating". Optics Letters 35, n. 6 (15 marzo 2010): 865. http://dx.doi.org/10.1364/ol.35.000865.

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Cannistra, Aaron T., Menelaos K. Poutous, Eric G. Johnson e Thomas J. Suleski. "Performance of conformal guided mode resonance filters". Optics Letters 36, n. 7 (25 marzo 2011): 1155. http://dx.doi.org/10.1364/ol.36.001155.

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Più fonti

Tesi sul tema "GUIDED FILTERS"

Boye, Robert Russell. "Physical optics approach to guided-mode resonance filters". Diss., The University of Arizona, 2000. http://hdl.handle.net/10150/284141.

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This dissertation develops a theoretical framework for guided mode resonance filters (GMRFs) with surface relief gratings based on a physical optics approach. A GMRF is a unique optical device that utilizes the resonance due to the coupling of a diffraction order of a grating with a waveguide mode. This coupling process leads to rapid fluctuations in the reflected and transmitted fields from the GMRF. The reflected output can change from 0% to 100% over extremely small wavelength (or angular) regions with a Lorentzian lineshape. It is shown that the surface relief gratings can be effectively modeled using effective medium theory (EMT). Combining the EMT modeled surface relief grating and thin film theory provides an approximation of the sidelobe levels around a resonance peak and can be used to design a grating that acts as an anti-reflection coating. In addition, EMT can be combined with multilayer waveguide relationships to provide an improved method for determining the wavelength of a resonance. The effect of a finite aperture grating upon the reflected and transmitted output from a GMRF is analyzed. The resonance peak width is found to be inversely proportional to the grating length and the peak efficiency of the GMRF is shown to decrease with reduced grating length. Finally, the design and analysis of a GMRF with a nonlinear waveguide is presented and shown to be capable of providing all-optical switching with low input intensities.

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Lai, Lin-Ying. "Suboptimal period design for a maneuvering missile to evade tracking filters". Diss., Virginia Polytechnic Institute and State University, 1988. http://hdl.handle.net/10919/53564.

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The engagement between an antiship missile and a ship’s defense system is investigated. The missile is equipped with proportional navigation guidance for homing in on its ship target. The ship’s defense system consists of a radar, an estimation system (the extended Kalman filter and the “jump filter” are used), and a gun system. The performance index is defined as the estimated number of hits (EHITS) of projectiles on the missile. The main objective of this dissertation is to determine maneuvering periods for the missile which minimize the EHITS to evade the ship’s gunfire under different engagement conditions. The maneuvering periods are design parameters in the missile’s controls of both the vertical and the horizontal planes. The engagement conditions are the follows: the maximum amplitude of the maneuvering functions, the homing in position of the missile on the ship, the measurement noise condition of the ship’s radar, and the missile’s model assumed in the ship’s filters. The missile’s control functions considered are periodic and of specific types (sinusoidal, square and sawtooth waveforms); therefore, the periods which minimize the EHITS in this study are suboptimal for the general engagement problem. Two methods are used to obtain the suboptimal periods: one is the ”brute force" method of computing the EHITS for certain equally spaced periods, the other uses an optimization software to search for the minimum point. The results show that the curve of EHITS vs. period is monotonically decreasing until it reaches a minimum point. The optimal period increases with an increase in measurement noise. Among the three waveforms used, the square wave gives the smallest optimal period and the sawtooth wave gives the largest one. The sinusoidal waveform with the period of 1.9 seconds is recommended. We consider the missile's performance against a perfect radar, a modern radar, and an earlier model radar. The optimum EHITS resulting from the optimal periods are between two and three EHITS for all three radars considered.
Ph. D.

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Boonruang, Sakoolkan. "TWO-DIMENSIONAL GUIDED MODE RESONANT STRUCTURES FOR SPECTRAL FILTERING APPLICATIONS". Doctoral diss., University of Central Florida, 2007. http://digital.library.ucf.edu/cdm/ref/collection/ETD/id/3940.

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Guided mode resonant (GMR) structures are optical devices that consist of a planar waveguide with a periodic structure either imbedded in or on the surface of the structure. The resonance anomaly in GMR structures has many applications as dielectric mirrors, tunable devices, sensors,and narrow spectral band reflection filters. A desirable response from a resonant grating filter normally includes a nearly 100% narrowband resonant spectral reflection (transmission), and a broad angular acceptance at either normal incidence or an oblique angle of incidence. This dissertation is a detailed study of the unique nature of the resonance anomaly in GMR structures with two-dimensional (2-D) periodic perturbation. Clear understanding of the resonance phenomenon is developed and novel 2-D GMR structures are proposed to significantly improve the performance of narrow spectral filters. In 2-D grating diffraction, each diffracted order inherently propagates in its distinct diffraction plane. This allows for coupled polarization dependent resonant leaky modes with one in each diffraction plane. The nature of the interaction between these non-collinear guides and its impact on spectral and angular response of GMR devices is investigated and quantified for 2-D structures with rectangular and hexagonal grids. Based on the developed understanding of the underlying phenomenon, novel GMR devices are proposed and analyzed. A novel controllable multi-line guided mode resonant (GMR) filter is proposed. The separation of spectral wavelength resonances supported by a two-dimensional GMR structure can be coarse or fine depending on the physical dimensions of the structure and not the material properties. Multiple resonances are produced by weakly guided modes individually propagating along multiple planes of diffraction. Controllable two-line and three-line narrow-band reflection filter designs with spectral separation from a few up to hundreds of nanometers are exhibited using rectangular-lattice and hexagonal-lattice grating GMR structures, respectively. Broadening of the angular response of narrow band two-dimension guided mode resonant spectral filters, while maintaining a narrow spectral response, is investigated. The angular response is broadened by coupling the diffracted orders into multiple fundamental guided resonant modes. These guided modes have the same propagation constant but propagating in different planes inherent in multiple planes of diffraction of the 2-D gratings. The propagation constants of the guided resonant modes are determined from the physical dimensions of the grating (periodicity and duty cycle) and the incident direction. A five-fold improvement in the angular tolerance is achieved using a grating with strong second Bragg diffraction in order to produce a crossed diffraction. A novel dual grating structure with a second grating located on the substrate side is proposed to further broaden the angular tolerance of the spectral filter without degrading its spectral response. This strong second Bragg backward diffraction from the substrate grating causes two successive resonant bands to merge producing a resonance with symmetric broad angular response.
Ph.D.
Optics and Photonics
Optics and Photonics
Optics PhD

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Melgarejo, Lermas Juan Carlos. "Advanced Techniques for the Design and Optimization of Multi-Band and Reconfigurable Microwave Waveguide Filters". Doctoral thesis, Universitat Politècnica de València, 2021. http://hdl.handle.net/10251/172728.

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[ES] El creciente número de dispositivos intercambiando datos ha empujado a las empresas del sector espacial a utilizar bandas de frecuencia cada vez más altas, como Ku, K y Ka, ya que permiten emplear canales de frecuencia más anchos. A medida que disminuye la longitud de onda, el tamaño de los filtros se reduce y, por tanto, son más sensibles a las desviaciones de fabricación. Para compensar estos errores, es necesario emplear elementos de sintonía en la etapa de diseño. En este contexto presentamos una estrategia de diseño que permite incluir todos los factores no ideales, como elementos de sintonía o esquinas redondeadas, en las simulaciones finales de filtros y multiplexores. Una vez se han fabricado los filtros es necesario ajustar manualmente los elementos de sintonía hasta recuperar la respuesta objetivo. Sin embargo, para realizar esta tarea con éxito es necesario tener mucha experiencia previa y, aún así, conlleva un tiempo considerable. Por tanto, también proponemos un procedimiento de sintonización eficiente y sistemático que permite a cualquier persona, independientemente de su experiencia previa en sintonización, realizar esta tarea con éxito. Además del aumento de las tasas de transmisión, otros desafíos del sector espacial son reducir el tamaño y peso de sus componentes, así como dotarlos de capacidad dereconfiguración. Emplear dispositivos multifunción como filtros multibanda o dispositivos reconfigurables es una posible solución. En este contexto, proponemos una nueva familia de filtros multibanda en guía de ondas que puede adaptarse a las futuras necesidades del sector espacial. Con el mismo objetivo, también proponemos una familia de dispositivos reconfigurables de varios estados discretos que pueden modificar su comportamiento de forma remota.
[CA] El creixent nombre de dispositius intercanviant dades ha empés a les empreses del sector espacial a utilitzar bandes de freqüència cada vegada més altes, com Ku, K i Ka, ja que permeten fer servir canals de freqüència més amples. A mesura que la longitud d'ona disminueix, la mida dels filtres es redueix i, per tant, són més sensibles a les desviacions de fabricació. Per compensar aquests errors, és necessari fer servir elements de sintonia en l'etapa de disseny. En aquest context presentem una estratègia de disseny que permet incloure tots els factors no ideals, com a elements de sintonia o cantonades arrodonides, en les simulacions finals de filtres i multiplexors. Una vegada s'han fabricat els filtres és necessari ajustar manualment els elements de sintonia fins a recuperar la resposta objectiu. Però, per realitzar aquesta tasca amb èxit és necessari tenir molta experiència prèvia i, així i tot, comporta un temps considerable. Per tant, també proposem un procediment de sintonització eficient i sistemàtic que permet a qualsevol persona, independentment de la seua experiència prèvia en sintonització, realitzar aquesta tasca amb èxit. A més de l'augment de les taxes de transmissió, altres desafiaments de el sector espacial són reduir la mida i pes dels seus components, així com dotar-los de capacitat de reconfiguració. Emprar dispositius multifunció com filtres multibanda o dispositius reconfigurables és una possible solució. En aquest context, proposem una nova família de filtres multibanda en guia d'ones que pot adaptar-se a les futures necessitats del sector espacial. Amb el mateix objectiu, també proposem una família de dispositius reconfigurables de diversos estats discrets que poden modificar el seu comportament de forma remota.
[EN] The need for ever increasing data rate of modern communication systems has motivated companies in the space sector to exploit higher frequency bands, such as Ku, K and Ka, in order to offer wider bandwidths to their customers. However, as the frequency increases, the wavelength decreases, and all waveguide hardware becomes smaller and more sensitive to deviations from the ideal dimensions that normally occur when manufacturing the devices. In order to compensate for these deviations (or errors), tuning elements must then be added to the hardware and included in the design process. In this context, therefore, we focus on the investigation of novel design strategies for filters and multiplexers with the objective of including all necessary non-ideal factors in the design process. It is important to note in this context that, once the filters are manufactured, the tuning elements are usually adjusted manually until the desired target performance has been achieved. However, successfully performing this task requires a considerable amount of time and very significant previous experience in tuning microwave filters. Consequently, an additional goal of our research work is to propose efficient and systematic tuning procedures so that anyone, regardless of their previous tuning experience, can successfully perform this difficult task. In addition to the increasing data rates, another current challenge of advanced communication systems is the ability to be reconfigured remotely to adjust to changes in costumer demands. The use of multi-function or reconfigurable devices is then an attractive possible solution. In this context, therefore, we also investigate new families of multi-band waveguide filters that can be used to accommodate several pass bands in the same filtering device. Furthermore, we also propose a new family of reconfigurable devices with several discrete states that can be easily controlled remotely.
Melgarejo Lermas, JC. (2021). Advanced Techniques for the Design and Optimization of Multi-Band and Reconfigurable Microwave Waveguide Filters [Tesis doctoral]. Universitat Politècnica de València. https://doi.org/10.4995/Thesis/10251/172728
TESIS

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Dancer, Michael William. "Analysis of the theta-D filter as applied to hit-to-kill interceptors and satellite orbit determination". Diss., Rolla, Mo. : Missouri University of Science and Technology, 2010. http://scholarsmine.mst.edu/thesis/pdf/Dancer_09007dcc807855a7.pdf.

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Thesis (M.S.)--Missouri University of Science and Technology, 2010.
Vita. The entire thesis text is included in file. Title from title screen of thesis/dissertation PDF file (viewed April 7, 2010) Includes bibliographical references (p. 70-77).

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Srinivasan, Pradeep. "DESIGN AND FABRICATION OF SPACE VARIANT MICRO OPTICAL ELEMENTS". Doctoral diss., University of Central Florida, 2009. http://digital.library.ucf.edu/cdm/ref/collection/ETD/id/2817.

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A wide range of applications currently utilize conventional optical elements to individually transform the phase, polarization, and spectral transmission/reflection of the incident radiation to realize the desired system level function. The material properties and the feasibility of fabrication primarily impact the device and system functionality that can be realized. With the advancement in micro/nano patterning, growth, deposition and etching technology, devices with novel and multiplexed optical functionalities have become feasible. As a result, it has become possible to engineer the device response in the near and far field by controlling the phase, polarization or spectral response at the micro scale. One of the methods that have been explored to realize unique optical functionalities is by varying the structural properties of the device as a function of spatial location at the sub-micron scale across the device aperture. Spatially varying the structural parameters of these devices is analogous to local modifications of the material properties. In this dissertation, the optical response of interference transmission filters, guided mode resonance reflection filters, and diffraction gratings operated in Littrow condition with strategically introduced spatial variation have been investigated. Spatial variations in optical interference filters were used to demonstrate wavelength tunable spatial filters. The effect was realized by integrating diffractive and continuous phase functions on the defect layer of a one-dimensional photonic crystal structure. Guided mode resonance filters are free space optical filters that provide narrow spectral reflection by combining grating and waveguide dispersion effects. Frequency dependent spatial reflection profiles were achieved by spatially varying the grating fill fraction in designed contours. Diffraction gratings with space variant fill fractions operating in Littrow condition were used to provide graded feedback profiles to improve the beam quality and spatial brightness of broad area diode lasers. The fabrication of space variant structures is challenging and has been accomplished primarily by techniques such as ruling, electron beam writing or complex deposition methods. In order to vary the desired structural parameter in a designed manner, a novel technique for the fabrication of space variant structures using projection lithography with a fidelity that rivals any of the current technologies was also developed as a part of this work. The devices exhibit wavelength dependent beam shaping properties in addition to spatial and spectral filtering and have potential applications in advanced imaging systems, graded reflectivity laser mirrors, and engineered illumination. The design, modeling, microfabrication and experimental characterization of space variant micro optical elements with novel optical functionalities are presented.
Ph.D.
Optics and Photonics
Optics and Photonics
Optics PhD

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Fong, Chung Yan. "Silicon-based laterally waveguide-coupled square microcavity channel add-drop filters /". View abstract or full-text, 2004. http://library.ust.hk/cgi/db/thesis.pl?ELEC%202004%20FONG.

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Thesis (M. Phil.)--Hong Kong University of Science and Technology, 2004.
Includes bibliographical references (leaves 98-103). Also available in electronic version. Access restricted to campus users.

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Lilonga-Boyenga, Désiré. "Contribution à la nouvelle formulation variationnelle : Application aux études des discontinuités et des filtres en guides d'ondes métalliques". Phd thesis, Toulouse, INPT, 2005. http://oatao.univ-toulouse.fr/7312/1/lilonga.pdf.

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Une nouvelle formulation variationnelle multi-modale est présentée et appliquée à la caractérisation des discontinuités entre guides d'ondes rectangulaires métalliques homogènes ou/et nervurés et, entre guides d'ondes chargés de diélectriques sur toute leur hauteur. Cette formulation qui permet de réduire le temps de calcul et d'améliorer la précision des résultats grâce à la prise en compte de tous les modes d'ordre supérieur des guides intermédiaires dans l'analyse des structures micro-ondes composées de plusieurs discontinuités uni-axiales, a permis de concevoir des transitions progressives en guides d'ondes rectangulaires nervurés entre un guide vide et une ligne micro-ruban ainsi que des filtres en guides d'ondes chargés de diélectrique sur toute leur hauteur. Ces dispositifs, conçus pour les bandes X, K et Ka, trouvent leur application dans les équipements d'instrumentation ou de télécommunications. Toutes les analyses ont été validées soit par des données de la littérature, soit par des simulations sur un logiciel basé sur la FEM, soit encore par des mesures expérimentales.

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Zheng, Shengmei. "Circular microresonator cross-connect filters and hexagonal microresonator add-drop filters in silicon nitride /". View abstract or full-text, 2005. http://library.ust.hk/cgi/db/thesis.pl?ELEC%202005%20ZHENG.

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Martin, Tifenn. "Air-Filled Substrate Integrated Waveguide (AFSIW) Filters and multiplexers for space application". Thesis, Bordeaux, 2019. http://www.theses.fr/2019BORD0391.

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L'émergence de nouvelles applications micro-ondes et millimétriques dans les secteurs de l'automobile et des communications, y compris l'Internet des objets (IoT), la cinquième génération de mobile (5G) et le nouvel espace, nécessite le développement de nouvelles technologies alternatives offrant un compromis approprié en termes de taille, de poids, de puissance et de coût (SWaP-C). Ce changement de paradigme est essentiellement dû à l'augmentation du débit de données, conduisant à la croissance des différentes bandes passantes. Étant donné qu'un nombre de plus en plus important de systèmes sont en concurrences pour l'occupation du spectre fréquentiel, la communauté des hyperfréquences est poussée à développer de nouveaux systèmes innovants à des fréquences plus élevées avec une efficacité accrue et un degré d’intégration élevé.Ce changement de paradigme a fortement stimulé le développement de systèmes micro-ondes et millimétriques à faible coût, à haute performance, hautement intégrés, compacts et pouvant être produits en masse. Au coeur d'un système, les filtres micro-ondes et millimétriques sont des dispositifs essentiels permettant de sélectionner l'information utile. Les filtres à faibles pertes sont très recherchés dans les circuits d'émission et de réception pour obtenir un rendement élevé et un faible niveau de rapport signal à bruit. La façon conventionnelle d'obtenir de faibles pertes est d'utiliser des résonateurs à haut facteur de qualité. Pour la plupart des applications à haute performance, la technologie des guides d'ondes rectangulaires (RWG) est utilisée pour être conforme aux spécifications sévères requises par l'industrie. Néanmoins, cette technologie devient prohibitive en termes de coût lorsqu'une production de masse est nécessaire. Pour réduire le coût de ces composants, l'utilisation de la technologie émergente des guides d'ondes intégrés au substrat (SIW) a été proposée. Cette technologie bénéficie d’un faible coût de fabrication et est facilement intégrable dans un système basé sur des circuits imprimés. La technologie SIW est une bonne candidate pour les applications qui nécessitant un faible coût avec des performances électriques moyennes, mais pour les applications de hautes performances, comme le nouvel espace, les performances atteintes ne sont pas conformes aux spécifications demandées, ce qui rend l'implémentation de la technologie SIW restrictive pour les applications haute performance.Récemment, le guide d'ondes intégré au substrat rempli d'air (AFSIW), basé sur les procédés standards de circuit imprimé multicouche (PCB), semblerait répondre aux exigences des applications de constellation de satellites, car il offre un compromis entre les technologies classiques RWG et SIW. Cette structure vise à réduire considérablement les pertes d'insertion du milieu de propagation, tout en maintenant le fort aspect d'intégration à faible coût. C'est donc une bonne candidate pour la future génération de charges utiles de satellites.Compte tenu du contexte présenté, les travaux menés au cours de cette thèse de doctorat ont été orientés vers la mise en oeuvre de la technologie AFSIW pour les nouvelles applications spatiales. Une attention particulière a été accordée à la proposition, à l'analyse, au développement et à la mise en oeuvre de concepts novateurs et originaux pour les fonctions de filtrage hyperfréquence. Le travail proposé est basé sur la théorie classique des guides d'ondes en tirant parti des procédés de fabrication standards des circuits imprimés pour permettre le développement de filtres et de multiplexeurs répondant aux spécifications des applications spatiales.Cette thèse de doctorat met en lumière les dernières avancées réalisées dans le développement de filtres hyperfréquences et de multiplexeurs utilisant la technologie AFSIW. Elle détaille, en partant des idées de départ, des démonstrations théoriques, des simulations et des validations expérimentales avec les prototypes fabriqués. [...]
The emergence of novel microwave and millimeter wave applications in the automotive and communication sectors including the internet of things (IoT), the fifth generation of mobile (5G), and the new space, require the development of new alternative technologies providing a suitable tradeoff in terms of size, weight, power, and cost (SWaP C). This change of paradigm is essentially due to the increase of data rate, leading to the growth of bandwidth. As a substantially increasing number of systems are competing for frequency spectrum occupancy, the microwave community is pushed to develop new innovative systems at higher frequency with an increased efficiency.This change of paradigm has highly stimulated the development of low cost, high performance, highly integrated, compact, and mass producible microwave and millimeter wave systems. At the heart of a system, microwave and millimeter wave filters are essential devices allowing to select the desired information. Low loss filters are highly desired in transmitter and receiver circuits to achieve high efficiency and low noise figures. The conventional way to achieve low loss performance is to use high quality factor resonators. For most high performance applications, the air-filled rectangular waveguide (RWG) technology is used to comply with the severe specifications requested by the industry. Nevertheless, this technology becomes prohibitive in terms of cost where a mass production is needed. To reduce the cost of such components, the use of the so called substrate integrated waveguide (SIW) emerging technology has been proposed. This technology benefits from low cost and highly integrated properties. The SIW technology is a good candidate for application that needs low cost with medium insertion loss, but for high performance applications, such as the emerging new space, the achieved performances are not compliant with the severe specifications, making the implementation of the SIW technology for high performance applications restrictive.Recently, the alternative air filled substrate integrated waveguide (AFSIW), based on multilayer printed circuit board (PCB) is expected to fulfill satellite constellation application requirements as it offers a compromise between the conventional RWG and SIW technologies. This structure aims to dramatically reduce the insertion loss of the propagation medium, while maintaining the high integration and low cost aspect. Hence making it a potential good candidate for future generation of satellite payloads.Taking into consideration the presented context, the work carried out during this Ph.D. thesis has been led towards the implementation of the AFSIW for the new space applications. A particular attention has been given to the proposal, analysis, development, and implementation of innovative and original concepts for microwave filtering functions. The proposed work is based on the classic waveguide theory taking advantage of the standard PCB process to allow the development of improved and novel filters and multiplexer for space applications.This Ph.D. thesis highlights the last advances made on the development of microwave filters and multiplexer using the AFSIW technology. This includes the starting ideas, theoretical demonstrations, simulations, and experimental validations with fabricated prototypes. The results of this work are promising and demonstrate the relevance of the technology for its implementation in future satellite payload systems. In fact, a sub system of a satellite payload has been developed in this thesis to answer the need of the European Space Agency (ESA) and the Centre National d’Études Spatiales (CNES). The demonstrated concepts gained from this thesis can be considered as a good base to further develop and popularize the AFSIW technology not only for space applications but also for ground systems

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Libri sul tema "GUIDED FILTERS"

Bernard, Piette. VHF/UHF filters and multicouplers. London, UK: ISTE, 2010.

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VHF/UHF filters and multicouplers. London, UK: ISTE, 2010.

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Bernard, Piette. VHF/UHF filters and multicouplers. London, UK: ISTE, 2010.

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Smith, Norman E. Practical guide to SGML filters. Plano, Tex: Wordware Pub., 1997.

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Frost, Lee. The photographer's guide to filters. Newton Abbot: David & Charles, 2002.

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E, Smith Norman. Practical guide to SGML/XML filters. Plano, Tex: Wordware Pub., 1998.

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Schneider, Karen G. A practical guide to Internet filters. New York: Neal-Schuman Publishers, 1997.

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The photographer's guide to using filters. New York: Amphoto Books, 1998.

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Meehan, Joseph. The photographer's guide to using filters. New York: Amphoto, 1992.

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The photographer's guide to using filters. New York: Amphoto, 1992.

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Capitoli di libri sul tema "GUIDED FILTERS"

Haus, Hermann A., Jay N. Damask e Mohammad J. Khan. "Distributed Feedback Channel Dropping Filters". In Guided-Wave Optoelectronics, 299–311. Boston, MA: Springer US, 1995. http://dx.doi.org/10.1007/978-1-4899-1039-4_38.

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Eknoyan, O., e H. F. Taylor. "Electrooptic Tunable Filters for WDM Networks". In Guided-Wave Optoelectronics, 17–24. Boston, MA: Springer US, 1995. http://dx.doi.org/10.1007/978-1-4899-1039-4_5.

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Chen, J. C., H. A. Haus, J. N. Winn, S. Fan e J. D. Joannopoulos. "Wide Stop Band Optical Filters from Photonic Band Gap Air Bridges". In Guided-Wave Optoelectronics, 477–83. Boston, MA: Springer US, 1995. http://dx.doi.org/10.1007/978-1-4899-1039-4_56.

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Hewa-Gamage, G., e P. L. Chu. "Single Band and Multi-Band Optical Waveguide Wavelength Filters Using Ion-Exchange Process". In Guided-Wave Optoelectronics, 167–75. Boston, MA: Springer US, 1995. http://dx.doi.org/10.1007/978-1-4899-1039-4_22.

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Dulhare, Uma N., e Areej Mohammed Khaleed. "Taj-Shanvi Framework for Image Fusion Using Guided Filters". In Data Management, Analytics and Innovation, 419–27. Singapore: Springer Singapore, 2019. http://dx.doi.org/10.1007/978-981-13-9364-8_30.

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Marques, Tunai Porto, Alexandra Branzan Albu e Maia Hoeberechts. "Enhancement of Low-Lighting Underwater Images Using Dark Channel Prior and Fast Guided Filters". In Pattern Recognition and Information Forensics, 55–65. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-030-05792-3_6.

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Yin, Hui, Yuanhao Gong e Guoping Qiu. "Guided Filter Bank". In Lecture Notes in Networks and Systems, 783–92. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-80119-9_50.

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Mijalković, Slobodan. "Filters". In A Practical Guide to Verilog-A, 201–14. Berkeley, CA: Apress, 2022. http://dx.doi.org/10.1007/978-1-4842-6351-8_14.

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Fisher, Bryan T., e Thomas C. Naslund. "Ultrasound-Guided Cava Filter Placement". In Noninvasive Vascular Diagnosis, 519–28. London: Springer London, 2012. http://dx.doi.org/10.1007/978-1-4471-4005-4_42.

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Arce-Santana, Edgar R., Daniel U. Campos-Delgado e Alfonso Alba. "Image Registration Guided by Particle Filter". In Advances in Visual Computing, 554–63. Berlin, Heidelberg: Springer Berlin Heidelberg, 2009. http://dx.doi.org/10.1007/978-3-642-10331-5_52.

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Atti di convegni sul tema "GUIDED FILTERS"

Mecozzi, Antonio. "Soliton dynamics with fixed and sliding filters". In Nonlinear Guided Waves and Their Applications. Washington, D.C.: Optica Publishing Group, 1996. http://dx.doi.org/10.1364/nlgw.1996.sab.1.

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Inline frequency filtering [1, 2] is a powerful method to extend the limits imposed to soliton transmission by the Gordon-Haus jitter [3] and by the intensity noise of the amplifiers [4]. The use of filters gives many advantages. One is the increase of the bitrate distance product, otherwise limited for pulses of high intensity by the Gordon-Haus effect and for pulses of low intensity by the amplitude noise induced on solitons by the amplified spontaneous emission noise. The window of permitted soliton energies is without filters about 3 dB for 2.5 Gbit transmission over transoceanic distances [4]. With filters, the window significantly opens [5]. Filters of arbitrary strength cannot however be used. It was predicted in Ref. [1] that the strength of filters is limited by the growth of continuous wave radiation close to the filter center frequency. An elegant way to overcome this problem is to move with distance the filter center frequency. The transmission line becomes transparent to the signal and opaque to the noise [6]. Unfortunately, the sliding action has undesired effects on soliton propagation. The solitons with larger bandwidth are trapped more efficient by the filters. This means that the offset of the soliton center frequency from the filter center frequency is larger for solitons having smaller bandwidth, and consequently smaller energy. This converts intensity fluctuations into frequency fluctuations producing, ultimately, timing jitter [7]. This is the reason for the Gordon-Haus jitter observed in the experiment of Mollenauer et al. [8] being twice the value predicted by the Gordon-Haus theory, corrected to include the action of fixed filters. If intensity fluctuations convert into frequency fluctuations, also frequency fluctuations produce intensity fluctuations because of the frequency dependent loss of the filters. This cross coupling is the physical reason for the existence of a maximum allowed sliding rate. Beyond a critical value, the positive feedback established between a proper combination of intensity and frequency fluctuations becomes unstable [6, 7]. The maximum sliding rate is proportional to the cube of the soliton energy. Consequently, for a given value of sliding rate, there is a minimum value of soliton energy for stability. Besides a minimum, there is also a maximum for the allowed soliton energies because, for increasing soliton energy hence for increasing bandwidth, larger excess gain of the amplifier is required to overcome the filter loss. For soliton energy exceeding this maximum, the sliding rate is not sufficient to sweep away the amplified spontaneous emission noise at the filter center frequency and the soliton becomes unstable. This limits the window of the allowed energies to 3 dB for an optimized line at 10 Gbit/s [9].

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Henry, C. H., Y. Shani, R. C. Kistler, T. E. Jewell, V. Pol, N. A. Olsson, R. F. Kazarinov e K. J. Orlowsky. "Compound Bragg Reflection Filters Made by a High Resolution Deep Ultraviolet Stepper". In Integrated and Guided Wave Optics. Washington, D.C.: Optica Publishing Group, 1989. http://dx.doi.org/10.1364/igwo.1989.tubb4.

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Optical filters are required for a variety of applications in optical communications such as wavelength division multiplexing and rejection of unwanted spontaneous emission in optical amplification. A good filter should have high throughput, a flat pass band and a high degree of rejection of unwanted wavelengths. Bragg filters having thousands of lines are capable of meeting these needs. In general, it is necessary to vary the period of these lines and to be able to form such filters at different places on the integrated optical circuit (IOC) chip.

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Jacket, Janet Lehr, e John Johnson. "Voltage-tunable wavelength filtering with a non-symmetric interferometer". In Integrated and Guided Wave Optics. Washington, D.C.: Optica Publishing Group, 1988. http://dx.doi.org/10.1364/igwo.1988.tuc7.

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There is increasing interest today in the use of wavelength division multiplexing in fiber communications systems, both to increase network capacity and to provide network flexibility. Many of the network architectures currently under study require, or would benefit from, tunable single-mode wavelength filters, multiplexers, or demultiplexers. We report here the use of a non-symmetric interferometer as a voltage-tunable wavelength filter with periodic wavelength response. We show that this filter can be used as a wavelength multiplexer, using known integrated optic components, and that it can be cascaded to separate 2n channels in n stages. We have made a series of filters with channel separation of 11 to 26 nm, using standard Ti:LiNbO3 waveguides. The filters are tunable over the period of their response, requiring less than 8 volts to tune through the complete period, and are capable of high speed operation.

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Heismann, F., W. Warzanskyj, R. C. Alferness e L. L. Buhl. "Narrowband Double-Pass Wavelength Filter with Broad Tuning Range". In Integrated and Guided Wave Optics. Washington, D.C.: Optica Publishing Group, 1988. http://dx.doi.org/10.1364/igwo.1988.me2.

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Wavelength multiplexed fiberoptic networks require broadly tunable narrowband wavelength filters that are compatible with single-mode fibers. In this paper we demonstrate an integrated-optical bandpass filter for 1.5 µm with a bandwidth of only 6 Å and a tuning range of at least 160 Å.

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Kodama, Y., S. Wabnitz, M. Romagnoli e M. Midrio. "Theoretical Analysis of Soliton Transmission with Sliding Filters". In Nonlinear Guided-Wave Phenomena. Washington, D.C.: Optica Publishing Group, 1993. http://dx.doi.org/10.1364/nlgwp.1993.tua.3.

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Theory and experimemts have shown that the insertion of bandpass filters after each amplifier in optical fiber transmission links may increase the stability of the soliton pulses with respect to the amplifier noise induced time jitter [1-4]. A substantial improvement to the stability of soliton transmissions may be achieved by slowly sliding the center frequency of subsequent filters along the transmission line [5].

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Tibuleac, S., D. Shin, R. Magnusson e C. Zuffada. "Guided-mode resonance filters generated with genetic algorithms". In Diffractive Optics and Micro-Optics. Washington, D.C.: Optica Publishing Group, 1998. http://dx.doi.org/10.1364/domo.1998.dmb.3.

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This paper focuses on the application of genetic algorithms to the study and design of reflection and transmission filters based on the guided-mode resonance (GMR) effect in waveguide gratings.1–3 As genetic algorithms are well suited for problems with multidimensional, large search spaces4, they may be used effectively for optical filter design involving multiple periodic and homogeneous layers. In this work, the genetic algorithm library PGAPACK5 is combined with a forward code based on rigorous coupled-wave analysis6 in a new computer program that optimizes the merit function of a multilayer diffractive optical structure. Thus, a GMR-filter response with a given central wavelength, linewidth and sideband levels can be specified with a corresponding diffractive structure yielding approximately the specified response provided by the program. The net effect of this approach is that the inverse problem of finding a structure (i. e., layer thicknesses, refractive indices, fill factors, grating period) that yields a given filter response can be solved. In addition to providing useful filter designs, this approach may aid in the discovery of diffractive structures with profiles that may differ significantly from those ordinarily treated.

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Alferness, R. C., T. L. Koch, L. L. Buhl, F. Storz, F. Heismann e M. J. R. Martyak. "Grating Assisted InGaAsP/InP Vertical Co-directional Coupler Filter". In Integrated and Guided Wave Optics. Washington, D.C.: Optica Publishing Group, 1989. http://dx.doi.org/10.1364/igwo.1989.waa6.

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Presently there is great interest in lightwave networks based upon wavelength division multiplexing techniques. Such systems, as well other applications such as noise filters for optical amplifiers, will require compact, possibly tunable wavelength filter devices. In addition, further benefits may result if these devices could be monolithically integrated with photodetectors or optical amplifiers. Toward that goal we have demonstrated, for the first time, a wavelength selective coupler based upon forward coupling between nonidentical, vertically stacked InGaAsP waveguides on InP using an etched corrugated layer for phase matching. We have achieved a bandpass filter response with a 3 dB bandwidth (full width at half maximum) of 65Å with an interaction length of only 1.0 mm using a grating period of 14.4 μm.

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Williams, William J. "Time-frequency-guided quadratic filters". In International Symposium on Optical Science and Technology, a cura di Franklin T. Luk. SPIE, 2002. http://dx.doi.org/10.1117/12.455785.

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Morgan, Robert A., J. Allen Cox, Robert Wilke e Carol Ford. "Applications of Guided-mode resonant filters to VCSELs". In Diffractive Optics and Micro-Optics. Washington, D.C.: Optica Publishing Group, 1998. http://dx.doi.org/10.1364/domo.1998.dmb.1.

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Within the last 2 years Vertical Cavity Surface Emitting Lasers (VCSELs) have emerged from the research laboratory into the commercial marketplace as the component of choice for numerous applications, supplanting both LED and edge-emitting sources. The enormous success of VCSELs is attributed, in part, to their premium performance, producibility, and packaging perks. Namely, significantly lower operating currents and power dissipation at Gb/s data rates; wafer-level batch fabrication, testing, and utilization of the existing LED and III-V manufacturing infrastructure; more efficient coupling into fibers and simplified drive electronics.1 These attributes result directly from the laser’s inherent vertical geometry. This vertical cavity is essentially a zero-order thin-film Fabiy-Perot transmission filter, utilizing integral quarter-wave high-reflectance (> 99%) interference stacks referred to as distributed Bragg reflectors (DBRs). On a parallel front, it has recently been suggested that high reflectivity possible from guided-mode grating resonant filters (GMGRFs)2–4 may likewise serve to construct the high-Finesse vertical cavity, requiring minimal layers. These "resonant reflectors" may be designed to provide ultra-narrow bandwidth filters for a selected center wavelength and polarization with ≅100% in-band reflectance and ~30dB sideband suppression. These are very attractive properties for VCSELs and offer the potential as an enabling tool for modal engineering.

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Matsumoto, Masayuki. "Analysis of stabilizing effect of filters in dispersion-managed soliton systems". In Nonlinear Guided Waves and Their Applications. Washington, D.C.: Optica Publishing Group, 1998. http://dx.doi.org/10.1364/nlgw.1998.nwc.3.

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Recent studies of dispersion-managed solitons show that their pulse energy in the steady state is larger than that of the conventional soliton with the same (minimum) pulse width and the same (averaged) fiber dispersion [1]. The enhanced pulse energy reduces the relative effect of noise emitted from inline optical amplifiers, which can extend the transmission distance. This indicates that the use of control schemes such as frequency-sliding filters and synchronous modulation may not be needed in the dispersion-managed soliton systems [2]. The use of filters with appropriate bandwidth, however, can be beneficial to increase further the system length [3]. The filters may also be effective to reduce mutual interaction between adjacent pulses that is one of the factors limiting the performance of dispersion-managed solitons with strong power enhancement. The author previously carried out a semi-numerical analysis of the effect of filters on the dispersion-managed soliton (stretched pulse) transmission [4]. In this paper analytical expressions for the strength of stabilizing pulse energy and frequency by the filters are given.

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Rapporti di organizzazioni sul tema "GUIDED FILTERS"

CORSCADDENorscadden, Louise, e Arpaporn Sutipatanasomboon. The Definite Guide to Flow Cytometry for Scientists. ConductScience, dicembre 2022. http://dx.doi.org/10.55157/cs20221213.

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Flow cytometry is an analytical technique that examines cells suspended in fluids. It uses a built-in laser beam to illuminate individual cells as the fluid passes through. The illumination causes fluorescence and scattered lights, which are emitted and reflected from the examining cell. These lights are split and filtered onto detectors and converted into electrical signals.

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Wang, Sean X., Vladimir Pelekhaty, Jolanta Rosemeier, Keith Li e Robert Scheerer. A Miniature Biosensor Based on Guided Wave Technology and An Acousto-Optic Tunable Filter. Phase 2. Fort Belvoir, VA: Defense Technical Information Center, giugno 1997. http://dx.doi.org/10.21236/ada367934.

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Chapman e Keshavarz-Valian. L51988 Development of Turbocharger-Reciprocating Engine Simulation (T-RECS). Chantilly, Virginia: Pipeline Research Council International, Inc. (PRCI), dicembre 2002. http://dx.doi.org/10.55274/r0010947.

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The objective of this project was to develop a numerical simulation system that can be used to optimize the performance of a large-bore reciprocating engine. The simulation system will include sub-models of all major components between the inlet filter and the exhaust pipe of the engine. The deliverable product of this project is the software program, Turbocharger-Reciprocating Engine Computer Simulation (T-RECS), which was developed at the National Gas Machinery Laboratory at Kansas State University. The simulation program calls upon a database of system components to allow the user specify a specific system. The database in this edition of T-RECS contains nominal components, but will be expanded under the Populate T-RECS project that has been funded by the Gas Research Institute. This report contains 1) a discussion of the methodology utilized to develop T-RECS; 2) a user�s guide; and 3) an example problem.

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Zhao, George, Grang Mei, Bulent Ayhan, Chiman Kwan e Venu Varma. DTRS57-04-C-10053 Wave Electromagnetic Acoustic Transducer for ILI of Pipelines. Chantilly, Virginia: Pipeline Research Council International, Inc. (PRCI), marzo 2005. http://dx.doi.org/10.55274/r0012049.

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In this project, Intelligent Automation, Incorporated (IAI) and Oak Ridge National Lab (ORNL) propose a novel and integrated approach to inspect the mechanical dents and metal loss in pipelines. It combines the state-of-the-art SH wave Electromagnetic Acoustic Transducer (EMAT) technique, through detailed numerical modeling, data collection instrumentation, and advanced signal processing and pattern classifications, to detect and characterize mechanical defects in the underground pipeline transportation infrastructures. The technique has four components: (1) thorough guided wave modal analysis, (2) recently developed three-dimensional (3-D) Boundary Element Method (BEM) for best operational condition selection and defect feature extraction, (3) ultrasonic Shear Horizontal (SH) waves EMAT sensor design and data collection, and (4) advanced signal processing algorithm like a nonlinear split-spectrum filter, Principal Component Analysis (PCA) and Discriminant Analysis (DA) for signal-to-noise-ratio enhancement, crack signature extraction, and pattern classification. This technology not only can effectively address the problems with the existing methods, i.e., to detect the mechanical dents and metal loss in the pipelines consistently and reliably but also it is able to determine the defect shape and size to a certain extent.

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Brug, William. Earth Filter Mathematica Toolbox V4 User’s Guide: Simplifying, Visualizing and Quick Modeling of All Fission Products from 60 Nuclear Sources. Office of Scientific and Technical Information (OSTI), luglio 2023. http://dx.doi.org/10.2172/1992246.

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