Bibliografias temáticas / Speculaur reflection

Literatura científica selecionada sobre o tema "Speculaur reflection"

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Publicado: 20 de julho de 2024

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Artigos de revistas sobre o assunto "Speculaur reflection"

1

Wendt, Florian, e Robert Höldrich. "Precedence effect for specular and diffuse reflections". Acta Acustica 5 (16 de dezembro de 2020): 1. http://dx.doi.org/10.1051/aacus/2020027.

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Studies on the precedence effect are typically conducted by presenting two identical sounds simulating direct sound and specular reflection. However, when a sound is reflected from irregular surface, it is redirect into many directions resulting in directional and temporal diffusion. This contribution introduces a simulation of Lambertian diffusing reflections. The perceptual influences of diffusion are studied in a listening experiment; echo thresholds and masked thresholds of specular and diffuse reflections are measured. Results show that diffusion makes the reflections more easily detectable than specular reflections of the same total energy. Indications are found that this mainly due to temporal diffusion, while the directional diffusion has little effect. Accordingly, the modeling of the echo thresholds is achieved by a temporal alignment of the experimental data based on the energy centroid of reflection responses. For the modeling of masked threshold the temporal masking pattern for forward masking is taken into account.
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Balakhonova, N. A., A. A. Kats, I. S. Spevak e A. V. Kats. "Suppression of Specular Reflection from a Well-Reflecting Surface". Telecommunications and Radio Engineering 52, n.º 12 (1998): 15–19. http://dx.doi.org/10.1615/telecomradeng.v52.i12.40.

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Kempic, Joy, Gary S. Olacsi e Robert J. Beaton. "Human Factors Assessment of ISO 9241-7, “Requirements for Displays with Reflections.”". Proceedings of the Human Factors and Ergonomics Society Annual Meeting 42, n.º 22 (outubro de 1998): 1555–59. http://dx.doi.org/10.1177/154193129804202205.

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This work evaluated the recently-published ISO 9241-7 “Ergonomic requirements for office work with visual display terminals (VDTs) - Part 7: Requirements for display with reflections” technical standard in terms of the readability of text passages presented on CRT displays. The effects of five illumination conditions and two screen contrast polarities on Tinker Reading Test scores (i.e., reading times and errors) were assessed for seven CRT/anti-reflection filter configurations. The readability scores were compared to ISO 9241-7 compliance classifications obtained for the seven CRT displays, as well as to two contrast metrics underlying the ISO 9241-7 compliance classifications: screen image luminance ratio and specular reflection luminance ratio. The findings show that only the specular reflection luminance ratio for large-area, negative polarity correlated with reading times. The present findings, along with those in a companion work (Olacsi, Kempic, and Beaton, 1998), contribute to the understanding of CRT viewability in glare environments and point out some shortcomings of ISO 9241-7. In particular, the findings indicate that specular reflections from CRTs degrade image quality more than do diffuse reflections, and, therefore, the importance of specular reflections is underemphasized in the ISO 9241-7 standard.
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Olacsi, Gary S., Joy Kempic e Robert J. Beaton. "Human Factors Assessment of ISO 9241-7, “Requirements for Displays with Reflections”". Proceedings of the Human Factors and Ergonomics Society Annual Meeting 42, n.º 22 (outubro de 1998): 1560–64. http://dx.doi.org/10.1177/154193129804202206.

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This work evaluated the recently-published ISO 9241-7 “Ergonomic requirements for office work with visual display terminals (VDTs) - Part 7: Requirements for display with reflections” technical standard in terms of perceived image quality judgments for CRT displays. The effects of five illumination conditions and two screen contrast polarities on image quality were assessed for seven CRT/anti-reflection filter configurations. Participants judged the image quality of the displays after reading text passages on the screen. Image quality judgments then were compared to ISO 9241-7 compliance classifications, as well as to two metrics inherent to the standard: screen image luminance ratio and specular reflection luminance ratio. The findings of this work (along with Kempic, Olacsi, and Beaton, 1998) contribute to a human factors justification of ISO 9241-7 and point up several shortcomings in this international standard. In particular, the findings indicate that specular reflections from CRTs degrade image quality more than do diffuse reflections, and, therefore, the importance of specular reflections is understated in the ISO 9241-7 standard.
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Yang, Xin Mi, Ge Lan Jiang, Xue Guan Liu e Cheng Xiang Weng. "Suppression of Specular Reflections by Metasurface with Engineered Nonuniform Distribution of Reflection Phase". International Journal of Antennas and Propagation 2015 (2015): 1–8. http://dx.doi.org/10.1155/2015/560403.

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We make preliminary investigations on a new approach to reducing radar cross section (RCS) of conducting objects. This approach employs novel planar metasurfaces characterizing nonuniform distribution of reflection phase. The operation principle of this approach and the design rule of the associated metasurfaces are explained using a simplified theoretical model. We then present a design example of such metasurfaces, in which three-layer stacked square patches with variable sizes are utilized as the reflecting elements. The proposed RCS-reduction approach is verified by both numerical simulations and measurements on the example, under the assumption of normal plane wave incidence. It is observed that, in a fairly wide frequency band (from 3.6 to 5.5 GHz), the presented example is capable of suppressing the specular reflections of conducting plates significantly (by more than 7 dB) for two orthogonal incident polarizations.
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Kopanas, Georgios, Thomas Leimkühler, Gilles Rainer, Clément Jambon e George Drettakis. "Neural Point Catacaustics for Novel-View Synthesis of Reflections". ACM Transactions on Graphics 41, n.º 6 (30 de novembro de 2022): 1–15. http://dx.doi.org/10.1145/3550454.3555497.

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View-dependent effects such as reflections pose a substantial challenge for image-based and neural rendering algorithms. Above all, curved reflectors are particularly hard, as they lead to highly non-linear reflection flows as the camera moves. We introduce a new point-based representation to compute Neural Point Catacaustics allowing novel-view synthesis of scenes with curved reflectors, from a set of casually-captured input photos. At the core of our method is a neural warp field that models catacaustic trajectories of reflections, so complex specular effects can be rendered using efficient point splatting in conjunction with a neural renderer. One of our key contributions is the explicit representation of reflections with a reflection point cloud which is displaced by the neural warp field, and a primary point cloud which is optimized to represent the rest of the scene. After a short manual annotation step, our approach allows interactive high-quality renderings of novel views with accurate reflection flow. Additionally, the explicit representation of reflection flow supports several forms of scene manipulation in captured scenes, such as reflection editing, cloning of specular objects, reflection tracking across views, and comfortable stereo viewing. We provide the source code and other supplemental material on https://repo-sam.inria.fr/fungraph/neural_catacaustics/
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Lim, Wooju. "Robust specular reflection removal and visibility enhancement of endoscopic images using 3-channel thresholding technique and image inpainting". Technium: Romanian Journal of Applied Sciences and Technology 2, n.º 7 (15 de dezembro de 2020): 336–43. http://dx.doi.org/10.47577/technium.v2i7.2164.

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Specular reflections create artifacts in endoscopic images, which may lead to misdiagnosis. In this paper, we propose a method for robust removal of specular reflections by using a thresholding technique in each of the RGB channels to segment the specular reflections from images. We further use dilation to ensure full local segmentation and inpainting to replace the areas of reflections with non-specular regions. Our method also provides a visibility enhancement feature to improve the decreased brightness due to the reflection removal by using the gamma-correction, histogram shift, and histogram equalization. On the Iparkmall Clinic dataset, our method has achieved average Peak-to-Signal-Noise Ratio (PSNR) of 42.62dB with a standard deviation of 5.80 dB and a minimum value of 23.3 dB. The average processing time was 219ms, enabling average 4 5 frames per second (FPS) processing speed on an Intel i7 processor.
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Niemitz, Lorenzo, Stefan D. van der Stel, Simon Sorensen, Walter Messina, Sanathana Konugolu Venkata Sekar, Henricus J. C. M. Sterenborg, Stefan Andersson-Engels, Theo J. M. Ruers e Ray Burke. "Microcamera Visualisation System to Overcome Specular Reflections for Tissue Imaging". Micromachines 14, n.º 5 (17 de maio de 2023): 1062. http://dx.doi.org/10.3390/mi14051062.

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In vivo tissue imaging is an essential tool for medical diagnosis, surgical guidance, and treatment. However, specular reflections caused by glossy tissue surfaces can significantly degrade image quality and hinder the accuracy of imaging systems. In this work, we further the miniaturisation of specular reflection reduction techniques using micro cameras, which have the potential to act as intra-operative supportive tools for clinicians. In order to remove these specular reflections, two small form factor camera probes, handheld at 10 mm footprint and miniaturisable to 2.3 mm, are developed using different modalities, with line-of-sight to further miniaturisation. (1) The sample is illuminated via multi-flash technique from four different positions, causing a shift in reflections which are then filtered out in a post-processing image reconstruction step. (2) The cross-polarisation technique integrates orthogonal polarisers onto the tip of the illumination fibres and camera, respectively, to filter out the polarisation maintaining reflections. These form part of a portable imaging system that is capable of rapid image acquisition using different illumination wavelengths, and employs techniques that lend themselves well to further footprint reduction. We demonstrate the efficacy of the proposed system with validating experiments on tissue-mimicking phantoms with high surface reflection, as well as on excised human breast tissue. We show that both methods can provide clear and detailed images of tissue structures along with the effective removal of distortion or artefacts caused by specular reflections. Our results suggest that the proposed system can improve the image quality of miniature in vivo tissue imaging systems and reveal underlying feature information at depth, for both human and machine observers, leading to better diagnosis and treatment outcomes.
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Marcinczak, Jan Marek, e Rolf-Rainer Grigat. "Closed Contour Specular Reflection Segmentation in Laparoscopic Images". International Journal of Biomedical Imaging 2013 (2013): 1–6. http://dx.doi.org/10.1155/2013/593183.

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Segmentation of specular reflections is an essential step in endoscopic image analysis; it affects all further processing steps including segmentation, classification, and registration tasks. The dichromatic reflectance model, which is often used for specular reflection modeling, is made for dielectric materials and not for human tissue. Hence, most recent segmentation approaches rely on thresholding techniques. In this work, we first demonstrate the limited accuracy that can be achieved by thresholding techniques and propose a hybrid method which is based on closed contours and thresholding. The method has been evaluated on 269 specular reflections in 49 images which were taken from 27 real laparoscopic interventions. Our method improves the average sensitivity by 16% compared to the state-of-the-art thresholding methods.
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Schleicher, J., P. Hubral e M. Tygel. "Nonspecular reflections from a curved interface". GEOPHYSICS 56, n.º 8 (agosto de 1991): 1203–14. http://dx.doi.org/10.1190/1.1443140.

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If an incident wavefield hits a curved interface that possesses certain inflection points, there may exist “nonspecular” events in the reflected field that cannot be explained by real ray theory. The magnitude of such events can reach the order of the specular ones and can be expressed in terms of specular reflections at certain points on the analytic continuation of the interface. In fact, specular reflected “complex rays,” connecting complex reflection points with the observation point, are used to explain such events. Previous results obtained for acoustic calculations, involving an incident plane wave and a perfectly soft reflector, are extended to arbitrary velocity and density contrasts, as well as to an incident far‐field cylindrical wavefield. Moreover, the agreement between analytic results and independent computations using a finite‐differences scheme is shown. It confirms the existence of nonspecular reflections. The interpreter of a seismic section should, therefore, be aware of not attributing a subsurface interface to a nonspecular reflection, e.g., at a flank of a saltdome.
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Teses / dissertações sobre o assunto "Speculaur reflection"

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Purcell, Isabella Pauline. "Specular reflection from interfaces". Thesis, University of Oxford, 1994. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.386624.

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Sferrazza, Michele. "The study of polymer interfaces by specular and off-specular neutron reflection". Thesis, University of Cambridge, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.624963.

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Ting, Choon Boon. "Universal Zero Specular Reflection Curves for MetaMaterials". Thesis, Monterey, California. Naval Postgraduate School, 2012. http://hdl.handle.net/10945/17469.

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Approved for public release; distribution is unlimited
Materials are generally classified in terms of their constitutive parameters, the complex permittivity and permeability , in the frequency domain. These parameters are used to determine the response of materials to electromagnetic (EM) radiation. Materials found in nature have positive real parts for both and . In recent years, researchers have shown that a new class of materials called metamaterials (MTMs), characterized by inclusions of various shapes and materials that are small compared to wavelength, result in an effectively homogeneous medium with the unique properties of negative real and which cause EM waves traveling through the medium to exhibit unusual characteristics. Zero specular reflection layers for four material types such as double positive (DPS), double negative (DNG), epsilon-negative (ENG) and mu-negative (MNG) materials are examined in this thesis. For each defined type of MTM, the transcendental equations are derived and solved numerically to generate curves for zero specular reflection. A MATLAB program was developed to generate universal curves for DPS, DNG, ENG, and MNG materials. The results were discussed and evaluated to determine wave behavior in each type of MTM as well as how they can be used as a matched-surface radar-absorbing material (RAM) for military application. The results were compared to published data.
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Brelstaff, Gavin J. "Inferring surface shape from specular reflections". Thesis, University of Edinburgh, 1988. http://hdl.handle.net/1842/15347.

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Dia, Amadou Sall. "Quantitative ultrasound imaging of human cortical bone". Electronic Thesis or Diss., Sorbonne université, 2024. https://theses.hal.science/tel-04650855.

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L'ostéoporose est une maladie caractérisée par une réduction de la masse osseuse et une augmentation de la porosité. Elle affaiblit les os et peut conduire à des fractures de fragilité. Globalement, 1/3 des femmes de plus de 50 ans et 1/5 des hommes de plus de 50 ans subiront des fractures liées à l'ostéoporose, contribuant à plus de 8,9 millions de fractures annuelles dans le monde. Ces fractures peuvent être prévenues si elles sont détectées et traitées suffisamment tôt. Plusieurs techniques ont été développées pour évaluer la qualité osseuse, l'échographie émergeant comme une option peu coûteuse, portable et sûre. L'imagerie par ultrasons du cortex des os longs permet l'évaluation de la qualité osseuse en estimant l'épaisseur corticale et la vitesse d'onde ultrasonore, des biomarqueurs de la résistance mécanique et du risque de fracture. Cependant, des défis se posent avec l'augmentation de la porosité corticale dans l'os ostéoporotique, rendant difficile la détection de la surface interne (endosteum) et limitant la qualité de l'image. L'objectif de ce travail est de concevoir une technique de reconstruction d'images capable d'améliorer les images échographiques de l'os cortical. Cela passe par la compréhension des facteurs influençant la qualité de l'image. Pour ce faire, des ensembles de données échographiques synthétiques et expérimentaux ont été générés. Nos résultats démontrent l'estimation réussie de l'épaisseur corticale et de la vitesse d'onde ultrasonore en utilisant l'imagerie par ultrasons pour un os cortical homogène. L'estimation in vivo de la vitesse d'onde au cortex tibial de sujets sains a atteint une précision de moins de 3%. Cependant, pour les os dégradés, une porosité corticale accrue et une taille de pore vasculaire plus grande créent un bruit qui obscurcit la visibilité de l'interface endostéale. Un nouvel algorithme de formation de faisceau spéculaire corrigé de la réfraction a été proposé pour améliorer la visibilité de l'interface endostéale. L'application de cet algorithme à la fois à des ensembles de données ex vivo et in vivo a révélé une visibilité améliorée par rapport à la formation de faisceau Delay-and-Sum (DAS) traditionnelle. Ce travail offre une meilleure compréhension des facteurs affectant le contraste des images échographiques osseuses et propose de considérer les diffuseurs comme des réflecteurs spéculaires pour améliorer la visibilité de l'interface endostéale. En évaluant la spécularité de l'interface endostéale, il devient possible d'évaluer potentiellement la rugosité de l'endosteum. Cela ouvre la voie à la conception de nouveaux quantificateurs de qualité mécanique osseuse. L'imagerie échographique osseuse montre des promesses dans l'identification et le suivi des personnes présentant une faible qualité mécanique osseuse corticale à risque de fracture ostéoporotique
Osteoporosis is a disease characterized by a decrease in bone mass and an increase in porosity, weakening the bones and potentially leading to fragility fractures. Globally, one-third of women over the age of 50 and one-fifth of men aged over 50 will experience osteoporosis-related fractures, contributing to over 8.9 million fractures annually worldwide. Early detection and treatment can prevent these fractures. Several techniques have been developed to assess bone quality, with ultrasound emerging as a cost-effective, portable, and safe option. Ultrasound imaging of the cortex of long bones allows for the evaluation of bone quality by estimating cortical thickness and ultrasonic wave-speed, which are biomarkers of mechanical strength and fracture risk. However, challenges arise with increased cortical porosity in osteoporotic bone, making it difficult to detect the inner surface (endosteum) and limiting image quality. The aim of this study is to design an image reconstruction technique to enhance ultrasound images of cortical bone. This involves understanding the factors influencing image quality. Synthetic and experimental ultrasound datasets were generated to achieve this. The results demonstrate successful estimation of cortical thickness and ultrasonic wave-speed using ultrasound imaging for homogeneous cortical bone. In vivo estimation of wave-speed at the tibial cortex of healthy individuals achieved a precision of less than 3%. However, for degraded bones, increased cortical porosity and vascular pore size create speckle that obscures the visibility of the endosteal interface. A novel refraction-corrected specular beamforming algorithm was proposed to improve the visibility of the endosteal interface. Application of this algorithm to both ex vivo and in vivo datasets revealed enhanced visibility compared to traditional Delay-and-Sum (DAS) beamforming. This study provides a better understanding of factors affecting bone ultrasound image contrast and proposes considering scatterers as specular reflectors to enhance endosteal interface visibility. By evaluating the specularity of the endosteal interface, it becomes possible to potentially assess the roughness of the endosteum. This opens a way for designing new bone mechanical quality quantifiers. Bone ultrasound imaging shows promise in identifying and monitoring individuals with low cortical bone mechanical quality at risk of osteoporotic fracture
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Willatt, A. J. "Specular reflection of neutrons and X-rays from interfaces". Thesis, University of Oxford, 1988. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.235074.

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Liu, Miaomiao, e 刘苗苗. "Pose estimation from reflections for specular surface recovery". Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2011. http://hub.hku.hk/bib/B47246376.

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This thesis introduces novel methods for estimating the poses of a reference plane from its reflections for specular surface recovery. Traditional methods for specular surface recovery usually introduce a second camera and an auxiliary calibration pattern to calibrate the poses of the reference plane with respect to the camera. The calibration procedures are comparatively tedious. Auto-estimating the poses of the reference plane is therefore an appealing problem. In the first part of this thesis, two novel and practical methods are proposed to recover the poses of a moving reference plane from its reflections produced on the specular surface given its initial position. As for the first approach, the reference plane is constrained to undergo an unknown pure translation. By observing the reflections of the moving reference plane produced on the specular surface, a closed form solution is derived for recovering the unknown translation. Degenerate cases in which the proposed method fails are studied. As for the second approach, the constraint on the motion of the reference plane is removed, and the reference plane can move freely. Again, a closed form solution is derived for the unknown motion defined by a rotation matrix and a translation vector, and the degenerate cases are also presented. The thesis finally considers the problem for auto-calibrating the reference plane against the camera for specular surface recovery without prior knowledge of the reference plane’s initial position. By only observing its reflections produced on the specular surface, the poses of the reference planes can be recovered in two steps. First, by applying a collinearity constraint to the specular correspondences, a simple closed form solution is derived for recovering the poses of the reference plane relative to its initial pose. Second, by applying a ray incidence constraint to the incident rays formed by the specular correspondences and the visual rays cast from the image, a closed form solution is derived for recovering the poses of the reference plane relative to the camera. The shape of the specular surface then follows.
published_or_final_version
Computer Science
Doctoral
Doctor of Philosophy
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Rhodes, Trevor Ian. "Neutron reflection used to investigate polymers and surfactants at the solid-liquid interface". Thesis, University of Oxford, 2003. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.275249.

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Ismail, Mostafa R. "The role of specular and diffuse reflections in urban noise propagation". Thesis, University of Liverpool, 2004. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.400183.

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Ganapathiraman, Subburengan. "QUANTIFICATION OF SURFACE DEFECTS USING PRIMARY HIGHLIGHT IN DIFFUSE ANGLE GRAY SCALE IMAGES". UKnowledge, 2005. http://uknowledge.uky.edu/gradschool_theses/348.

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The thesis presented is an effort to gather all possible information of one particular type of common paint defect the seed defect, from gray scale images of highly specular painted surface. The proposed approach in the thesis utilizes a white light source to illuminate the surface and utilizes a camera to capture its gray scale image at different diffused angles. While attempting to explain the physics of highlight formation in terms of location on the surface of a seed defect, the thesis also extends to utilize this information from gray scale images to accurately predict the parameters of seed defects including the height, size and position in real time. Since the primary highlight in a gray scale image is more defined, contrary to the past researches on diffuse angle images that use both primary / seed highlight and mirror highlight to estimate height of the seed, this thesis formulates a theory of highlight translation and estimates the height of seed based on primary / seed highlight. The other common type of surface defect - crater defect, is also addressed in the thesis.
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Livros sobre o assunto "Speculaur reflection"

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Nadal, Maria E. Specular gloss. Gaithersburg, MD: U.S. Dept. of Commerce, Technology Administration, National Institute of Standards and Technology, Physics Laboratory, Optical Technology Division, 2006.

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L, Eckerle Kenneth, Hsia J. J e National Institute of Standards and Technology (U.S.), eds. Absolute specular reflectometer with an autocollimator telescope and auxiliary mirrors. Gaithersburg, MD: U.S. Dept. of Commerce, National Institute of Standards and Technology, 1990.

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3

Georgiana, Donavin, Nederman Cary J e Utz Richard J. 1961-, eds. Speculum sermonis: Interdisciplinary reflections on the medieval sermon. Turnhout: Brepols, 2004.

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Frelick, Nancy M. The mirror in medieval and early modern culture: Specular reflections. Turnhout, Belgium: Brepols, 2016.

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5

Museum, Ackland Art. Spectans specula: Reflecting on princely and priestly perfections. Chapel Hill, NC: Ackland Art Museum, University of North Carolina at Chapel Hill, 2003.

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6

Stynes, J. Kathleen. Slope error measurement tool for solar parabolic trough collectors: Preprint. [Golden, Colo.]: National Renewable Energy Laboratory, 2012.

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M, Dever Therese, Quinn William F e United States. National Aeronautics and Space Administration., eds. The effect of leveling coatings on the atomic oxygen durability of solar concentrator surfaces. [Washington, D.C.]: National Aeronautics and Space Administration, 1990.

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8

1958-, Aubert Jean-Jacques, e Sirks Adriaan Johan Boudewijn, eds. Speculum iuris: Roman law as a reflection of social and economic life in antiquity. Ann Arbor: University of Michigan Press, 2002.

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9

Ziaja, Luisa, Véronique Abpurg, Stella Rollig e Severin Dünser. Spiegelnde Fenster: Reflexionen von Welt und Selbst = Specular windows : reflections on the self and the wider world. Editado por 21er Haus (Österreichische Galerie Belvedere). Wien: Österreichische Galerie/Belvedere, 2017.

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Kruijs, R. W. E. Van De. Specular & Off-Specular Reflection of Polarized Neutrons from Magnetic Thin Films & Multilayers. Delft Univ Pr, 2002.

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Capítulos de livros sobre o assunto "Speculaur reflection"

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Gooch, Jan W. "Specular Reflection". In Encyclopedic Dictionary of Polymers, 688. New York, NY: Springer New York, 2011. http://dx.doi.org/10.1007/978-1-4419-6247-8_10989.

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Weik, Martin H. "specular reflection". In Computer Science and Communications Dictionary, 1635. Boston, MA: Springer US, 2000. http://dx.doi.org/10.1007/1-4020-0613-6_17907.

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Frost, Adam, Sophia Mirashrafi, Clara Molina Sánchez, David Vacas-Madrid, Elina Rodriguez Millan e Lyn Wilson. "Digital Documentation of Reflective Objects: A Cross-Polarised Photogrammetry Workflow for Complex Materials". In 3D Research Challenges in Cultural Heritage III, 131–55. Cham: Springer International Publishing, 2023. http://dx.doi.org/10.1007/978-3-031-35593-6_7.

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AbstractThe quality of digital documentation of cultural heritage sites and objects is influenced significantly by the complexity of the subject. Complexity is an encompassing concept comprised of a range of factors including material properties and surface characteristics. Highly reflective items pose a challenge to traditional workflows, which has been previously addressed with a range of mitigating techniques and strategies, often including cross-polarised photogrammetry lighting setups to omit specular type reflections. However, in the removal of reflections to achieve more robust surface geometry, important information about the specular albedo of the surface can be lost. In this paper we demonstrate an accessible single camera cross-polarised photogrammetry workflow to retain the diffuse and specular albedo information. The results have enabled qualitative assessments about the individual objects and their materials through the workflow. The items discussed include ceramic, metal and wood material types, and through the separation of specular information offer unique improvements to their visualisation and insights to their physical condition for conservation purposes.
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Agarwal, Ayush, Faraaz Ali, Aditya Kopparthi, Priya Ranjan, Kumar Dron Shrivastav e Rajiv Janardhanan. "Specular Reflection Removal in Cervigrams". In Lecture Notes in Networks and Systems, 423–37. Singapore: Springer Singapore, 2021. http://dx.doi.org/10.1007/978-981-16-4244-9_35.

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Wichard, R., e W. Dietsche. "Specular Phonon Reflection in Anisotropic Media". In Springer Series in Solid-State Sciences, 71–72. Berlin, Heidelberg: Springer Berlin Heidelberg, 1993. http://dx.doi.org/10.1007/978-3-642-84888-9_26.

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Thomas, L. "Factoring a specular reflection Field Into added iffuse reflection Fields". In Advances in Modelling, Animation and Rendering, 349–76. London: Springer London, 2002. http://dx.doi.org/10.1007/978-1-4471-0103-1_22.

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Plattner, Michael, e Gerald Ostermayer. "Filtering Specular Reflections by Merging Stereo Images". In Image Analysis, 164–72. Cham: Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-20205-7_14.

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Howard, Peter. "Sermons Reflecting Upon Their World(s): A Response to Stephen Morris, Wim Verbaal, Eve Salisbury, and Emily Michelson". In Speculum Sermonis, 181–94. Turnhout: Brepols Publishers, 2004. http://dx.doi.org/10.1484/m.disput-eb.3.1619.

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Hirvonen, Antti, Atte Seppälä, Maksim Aizenshtein e Niklas Smal. "Accurate Real-Time Specular Reflections with Radiance Caching". In Ray Tracing Gems, 571–607. Berkeley, CA: Apress, 2019. http://dx.doi.org/10.1007/978-1-4842-4427-2_32.

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Zhang, Zhong, e Changjiang Li. "Defect Inspection for Curved Surface with Highly Specular Reflection". In Integrated Imaging and Vision Techniques for Industrial Inspection, 251–317. London: Springer London, 2015. http://dx.doi.org/10.1007/978-1-4471-6741-9_9.

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Trabalhos de conferências sobre o assunto "Speculaur reflection"

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Tominaga, Shoji. "Color reflection models on materials". In OSA Annual Meeting. Washington, D.C.: Optica Publishing Group, 1991. http://dx.doi.org/10.1364/oam.1991.tuj4.

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An important role of surface spectral reflectance is to supply the physical basis for object color perception and surface identification. The behavior of the reflectance function depends on the surface materials. In this paper we propose color reflection models for a variety of objects based on the analysis of the reflected light spectra from the object surfaces and their surface spectral reflectances. First, we test the adequacy of the standard dichromatic reflection model. The model assumes that the reflected light is composed of two components of specular and diffuse reflections and that the specular reflection is constant over the visible wavelength. The experimental results show that the standard model is adequate for many materials, but it is inadequate for metals composed of only specular reflection, and for some paper and cloth. Next, we analyze the surface spectral reflectances of these inadequate materials to supply a proper model. The paper and cloth can be approximated with the generalized dichromatic reflection model with chromatic specular reflection. Furthermore, metals can be approximated with the dichromatic reflection model with two specular reflection components. Thus, it is shown that color reflection for most objects is expressed in three kinds of dichromatic reflection models.
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Huang, Lei, Chiseng Ng e Anand Krishna Asundi. "Dynamic 3D Measurement for Specular Reflecting Surface with Monoscopic Fringe Reflection Deflectometry". In Computational Optical Sensing and Imaging. Washington, D.C.: OSA, 2011. http://dx.doi.org/10.1364/cosi.2011.cwc3.

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Petrasch, Jo¨rg, e Aldo Steinfeld. "A Novel High-Flux Solar Simulator Based on an Array of Xenon Arc Lamps: Optimization of the Ellipsoidal Reflector and Optical Configuration". In ASME 2005 International Solar Energy Conference. ASMEDC, 2005. http://dx.doi.org/10.1115/isec2005-76009.

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The optical characteristics of a high-flux solar simulator that comprises an array of Xe-arc lamps with ellipsoidal specular reflectors of common focus is examined using the Monte Carlo ray tracing technique. The parameters varied are arc diameter, focal length, eccentricity, truncation diameter, and angular error of specular reflection. The geometrical design of the truncated ellipsoidal reflector is optimized for maximum transfer efficiency, defined as the portion of radiation intercepted by a circular target centered at the common focal point. An array of ten 15 kW Xe-arc lamps of 9 mm electrode gap and 35% electrical-to-radiant efficiency, each closed-coupled with an ellipsoidal reflector of optimum design, should be capable of delivering an average radiative power flux exceeding 5900 kW/m2 over a 6 cm-diameter circular target, with an overall transfer efficiency of 31.9%.
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van der Voort, André. "Development of optical coatings for CMT’s". In Optical Interference Coatings. Washington, D.C.: Optica Publishing Group, 1997. http://dx.doi.org/10.1364/oic.1998.the.1.

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Today all Colour Monitor Tubes (CMT) are provided with an optical coating. Most of these coatings reduce specular reflection by diffuse light reflection, but also conductive interference coatings are introduced to reduce specular reflection and to discharge the tube surface.
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Yuanliu Liu, Zejian Yuan, Nanning Zheng e Yang Wu. "Saturation-preserving specular reflection separation". In 2015 IEEE Conference on Computer Vision and Pattern Recognition (CVPR). IEEE, 2015. http://dx.doi.org/10.1109/cvpr.2015.7298996.

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Lin, YinWen, e Hua Yan. "Improvement of specular reflection pyrometer". In Microlithography '91, San Jose,CA, editado por Ramon P. DePaula e Eric Udd. SPIE, 1991. http://dx.doi.org/10.1117/12.24755.

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Tang, Shu-Guo, Kevin G. Harding, Gregory O'Neil e Jin Cai. "Specular-reflection-based flatness tester". In Photonics Technologies for Robotics, Automation, and Manufacturing, editado por Bruce G. Batchelor e Heinz Hugli. SPIE, 2004. http://dx.doi.org/10.1117/12.520705.

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Foo, Leslie D., e Orestes N. Stavroudis. "Reflective optical baffle concept". In OSA Annual Meeting. Washington, D.C.: Optica Publishing Group, 1991. http://dx.doi.org/10.1364/oam.1991.tuc2.

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In the past the optical baffle usually consisted of a cylindrical tube assembly with a black interior vane structure to create a highly absorptive labyrinth to trap and absorb light before it propagated further into the optical system. This type of baffle is well developed and is suitable for a myriad of optical system uses. However, in certain stressing environments or conditions, the black baffle degrades and may fail to absorb a sufficient amount of stray light. To address these conditions, an approach to optical baffle design based on reflection rather than absorption has been developed. Although similar reflective baffle structures have been studied and developed, this new approach utilizes all reflective confocal conic surfaces to reject incident specular energy. Total specular rejection of incident energy is achieved by using a combination of vane surfaces described as oblate spheroids and hyperboloids of one sheet which have common foci at the entrance aperture of the baffle assembly. When surfaces are arrayed in this manner to create a series of baffle vanes, light incident on the vanes is reflected by these surfaces back out of the assembly through the entrance aperture with no specular propagation further into the baffle assembly.
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Tominaga, Shoji, e Brian A. Wandell. "Estimation of Surface Spectral Reflectance on the Standard Model". In Image Understanding and Machine Vision. Washington, D.C.: Optica Publishing Group, 1989. http://dx.doi.org/10.1364/iumv.1989.mb2.

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The standard reflectance model for inhomogeneous materials suggests that to a good approximation the reflectance function can be described as the weighted sum of two functions1,2. One function represents the interface (specular) reflection, and the second function represents the subsurface (diffuse) reflection. Let S I (λ) and S S (λ) be the surface spectral reflectances for the two components of interface and subsurface reflections, and let E(λ) be the spectral power distribution of the incident light. Then reflected light is where c I (θ) and c S (θ) are the geometric scale factors. The parameters θ vary with the viewing geometry. In a previous paper2 we have evaluated this model and shown how to use light reflected from pairs of surfaces to estimate the spectral power distribution of the illuminant.
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Venkateswarlu, Putcha, Mostafa Dokhanian, P. Chandra Sekhar e M. C. George. "Coupling of self-pumped phase-conjugate oscillations to reflections and transmissions of incoherent beams in barium titanate". In OSA Annual Meeting. Washington, D.C.: Optica Publishing Group, 1990. http://dx.doi.org/10.1364/oam.1990.mhh4.

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If an extraordinary polarized laser beam A1 is incident on an electrically poled BaTiO3 crystal, the specular reflection A1R1 and the second surface reflection A1R2 decrease in intensity, while the phase conjugate A1* and the associated transmissions A1T1, A1T2 de velop.1 These effects can be dramatically observed with self-pumped phase conjugate oscillations, which are cross-coupled to the transmissions and reflections of an intersecting incoherent beam. A He-Ne laser beam A1 (25mw) with an angle of incidence,, enters the crystal at 2mm from one edge. A1*, A1T1, and A1T2 show regular oscillations, while A1R1 and A1R2 show oscillations, our of phase with those of A*l. If an incoherent beam A2 with ,, is put on, A*2 and A2T1 decrase in intensity and exhibit oscillaitons through beam coupling.
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Relatórios de organizações sobre o assunto "Speculaur reflection"

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Zokay, Mustapha, e Hicham Saylani. Removing specular reflection in multispectral dermatological images using blind source separation. Peeref, junho de 2023. http://dx.doi.org/10.54985/peeref.2306p8383322.

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Nelsen, James M. ,. Jr, Robert James Hohlfelder, Dale Clayton Jackson e Randolph S. Longenbaugh. On identifying the specular reflection of sunlight in earth-monitoring satellite data. Office of Scientific and Technical Information (OSTI), março de 2009. http://dx.doi.org/10.2172/972492.

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Miller, Allen R., e Emanuel Vegh. Exact Result for the Grazing Angle of Specular Reflection from a Sphere. Fort Belvoir, VA: Defense Technical Information Center, agosto de 1991. http://dx.doi.org/10.21236/ada239578.

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Schöner, Wolfgang, Jorrit van der Schot, Peter Schweitzer, Sophie Elixhauser e Anna Burdenski. Snow to Rain: From phase transition of precipitation to changing local livelihoods, emotions and affects in East Greenland. Verlag der Österreichischen Akademie der Wissenschaften, outubro de 2023. http://dx.doi.org/10.1553/ess-snow2rain.

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Snow2Rain investigated the impacts and perception of climate change in East Greenland through a holistic approach that includes natural science methods of time series analysis and statistical climatology on the one hand, and social science approaches of social anthropology on the other. In addition, this interdisciplinary approach was based in a transdisciplinary framework by involving the local people in Tasiilaq (East Greenland) and their knowledge. Based on the intention to study the effects of climate close to the everyday life of the locals, snow was chosen as one such interdisciplinary indicator of climate change. In addition, Greenland, as the study site of Snow2Rain, is a region in the Arctic and thus affected by Arctic amplification (implying a temperature increase of about three times the global average). With this in mind, Snow2Rain examined changes in snow characteristics in East Greenland and their underlying mechanisms, and placed these changes in the context of social and cultural as well as socioeconomic impacts for local people. From the main results of Snow2Rain, it can be concluded that (i) Arctic amplification is less pronounced compared to other regions in the Arctic and therefore climate change impacts (e.g., changes in snowpack, transition from snowfall to rain) are less pronounced and co-determined by precipitation changes. The strongest signals for the transition from snow to rain were found for the summer season. In addition, the most important climate change events currently discussed by locals in Tasiilaq are the storm winds known as piteraqs and icequakes (earthquakes triggered by calving glaciers). There is considerable interest in scientific information about meteorological and climate conditions as well as changes in the community of Tasiilaq, even though the topic of climate change is not the most pressing issue within the community. It also became clear that local knowledge holders from Tasiilaq hold relevant knowledge about past snow and environmental conditions (e.g. stories about snow conditions along dogsledding routes), but several challenges exist that make it a complex task to make this knowledge usable for climate scientists. To give a few examples of the existing knowledge, there is a lot of relevant knowledge about changes in wind direction and wind speed, and particularly a lot of memories exist in relation to extreme wind events (piteraqs and other storm winds). Overall, the perception of climate change in Greenland is different than in Europe (the recent signing of the Paris Agreement seems to be a clear reflection of this). People from Tasiilaq region are very sensitive in observing changes of their environment including the climate. Snow is only one of those changes observed (wind/storms and earthquakes are currently widely discussed by the locals). However, they speculate much less about future changes and are cautious about the human influence on climate change.
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