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Littérature scientifique sur le sujet « LE. Scanners »

Auteur : Grafiati
Publié le 10 mars 2023

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Articles de revues sur le sujet "LE. Scanners"

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Rotar, Raul Nicolae, Anca Jivanescu, Codruta Ille, Angela Codruta Podariu, Daniela Elisabeta Jumanca, Ana-Maria Matichescu, Octavia Balean et Laura Cristina Rusu. « Trueness and Precision of Two Intraoral Scanners : A Comparative In Vitro Study ». Scanning 2019 (21 octobre 2019) : 1–6. http://dx.doi.org/10.1155/2019/1289570.

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The aim of this study was to evaluate the accuracy of two intraoral scanners used in the dental office. A molar fixed in a typodont was prepared for a ceramic onlay. The preparation was scanned using a high-resolution scanner (reference scanner) and saved as stereolithography (STL) format. The prepared resin molar was scanned again using the intraoral scanners, and all the scans were saved as well in STL format. All STL files were compared using metrology software (Geomagic Control X). Overlapping the meshes allowed the assessment of the scans in terms of trueness and precision. Based on the results of this study, the differences of trueness and precision between the intraoral scanners were minimal.
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Carvalho, William S., Viviane de S. M. Almeida, Leonardo Provedel, Anderson da S. Maciel et Viviane A. Sarmento. « Volumetric Evaluation of 3D Models Generated by Different Surface Treatment Protocols ». European Journal of Dental and Oral Health 3, no 5 (23 décembre 2022) : 5–8. http://dx.doi.org/10.24018/ejdent.2022.3.5.229.

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The objective of this study was to compare the volume of three-dimensional (3D) models generated by different scanners and computational modeling protocols. Eight dry mandibles were scanned by five different computed tomography (CT) scanners and by a 3D-scanner. Three-dimensional models were generated, received different surface treatment processes, and the final volume of the 3D models was compared. The results show that there was no significant difference among the volume of the 3D models generated by the different CT scanners and surface treatment techniques, however, the model volume generated by the 3D-scanner show the highest volume. It can be concluded that the different combinations of surface treatment protocols did not determine differences in the model volume generated by different CT and CBCT scanners and that the 3D-scanner determined the highest volume models.
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Rabah, Chaima Ben, Gouenou Coatrieux et Riadh Abdelfattah. « Boosting up Source Scanner Identification Using Wavelets and Convolutional Neural Networks ». Traitement du Signal 37, no 6 (31 décembre 2020) : 881–88. http://dx.doi.org/10.18280/ts.370601.

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In this paper, we present a conceptually innovative method for source scanner identification (SSI), that is to say, identifying the scanner at the origin of a scanned document. Solutions from literature can distinguish between scanners of different brands and models but fail to differentiate between scanners of the same models. To overcome this issue, the approach we propose takes advantage of a convolutional neural network (CNN) to automatically extract intrinsic scanner features from the distribution of the coefficients of the diagonal high-frequency (HH) sub-band of the discrete stationary wavelet transform (SWT) of scanned images. Such information serves as a reliable characteristic to classify scanners of different/same brands and models. Experiments conducted on a set of 8 scanners yielded a model with an accuracy of 99.31% at the block level and 100% at the full image level, showcasing the potential of using deep learning for SSI and outperforming existing schemes from literature. The influence of the model’s parameters such as the input size, the training data size, the number of layers, and the number of nodes in the fully connected layer as well as the effect of the pre-processing step were investigated.
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Baier, Valentin, Michael Schardt, Maximilian Fink, Martin Jakobi et Alexander W. Koch. « MEMS-Scanner Testbench for High Field of View LiDAR Applications ». Sensors 22, no 1 (22 décembre 2021) : 39. http://dx.doi.org/10.3390/s22010039.

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LiDAR sensors are a key technology for enabling safe autonomous cars. For highway applications, such systems must have a long range, and the covered field of view (FoV) of >45° must be scanned with resolutions higher than 0.1°. These specifications can be met by modern MEMS scanners, which are chosen for their robustness and scalability. For the automotive market, these sensors, and especially the scanners within, must be tested to the highest standards. We propose a novel measurement setup for characterizing and validating these kinds of scanners based on a position-sensitive detector (PSD) by imaging a deflected laser beam from a diffuser screen onto the PSD. A so-called ray trace shifting technique (RTST) was used to minimize manual calibration effort, to reduce external mounting errors, and to enable dynamical one-shot measurements of the scanner’s steering angle over large FoVs. This paper describes the overall setup and the calibration method according to a standard camera calibration. We further show the setup’s capabilities by validating it with a statically set rotating stage and a dynamically oscillating MEMS scanner. The setup was found to be capable of measuring LiDAR MEMS scanners with a maximum FoV of 47° dynamically, with an uncertainty of less than 1%.
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Cai, HongXin, Bing Cheng Zhao, Yueyi Tian, Dong-Hyuck Kim, Yunhan Sun, Ho-Kyung Lim, Eui-Seok Lee et Heng Bo Jiang. « Design of a Single-Tooth Model and Its Application in Oral Scan System Assessment ». Scanning 2021 (21 mars 2021) : 1–8. http://dx.doi.org/10.1155/2021/8891396.

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Intraoral scanners have been widely used in the application of dentistry. Accuracy includes trueness and precision; they have an important position in the assessment of intraoral scanners. The existing standard models are divided into the inlay and the crown, but the operation is relatively complicated. In this study, in order to simplify the current standard model, we designed a new integration model to compare the accuracy of two intraoral scanners (CEREC and TRIOS) and an extraoral scanner (SHINING). The coordinate measuring machine measured value is the gold standard. Values of the length and angle were analyzed by converting the scanned digital impressions into an STL (standard triangulation language) format to evaluate the accuracy of the intraoral scanner and to verify the feasibility of the designed model. The result shows that the integration model can be successfully scanned and imaged. In the case of the powder-free integration model, intraoral scanner precision, trueness, 3D fitting, and imaging are better than the extraoral scanner. It can be seen straightly from the measurement result and the 3D fitting result that the intraoral scanner can acquire the shape of the standard model integrally with good repeatability. Therefore, it can be concluded that TRIOS is superior to CEREC and SHINING in accuracy, and the integration model is feasible as a reference in the examination of intraoral scanners. The performance of the newly designed integration model that can be scanned is clinically significant, suggesting that this model can be used as a standard reference model.
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Bohner, Lauren, Daniel Habor, Klaus Radermacher, Stefan Wolfart et Juliana Marotti. « Scanning of a Dental Implant with a High-Frequency Ultrasound Scanner : A Pilot Study ». Applied Sciences 11, no 12 (14 juin 2021) : 5494. http://dx.doi.org/10.3390/app11125494.

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The purpose of this in vitro study was to assess the trueness of a dental implant scanned using an intraoral high-frequency ultrasound prototype and compared with conventional optical scanners. An acrylic resin cast containing a dental implant at position 11 was scanned with a fringe projection 3D sensor for use as a reference dataset. The same cast was scanned 10 times for each group. Ultrasound scanning was performed with a high-frequency probe (42 MHz, aperture diameter of 4 mm and focus length of 8 mm), and 3D images were reconstructed based on the depth of each surface point echo. Optical scans were performed in a laboratory and with an intraoral scanner. A region of interest consisting of the dental implant site was segmented and matched to the reference dataset. Trueness was defined as the closeness between experimental data and the reference surface. Statistical analysis was performed with one-way ANOVA and post-hoc tests with a significance level of p = 0.05. No statistical difference was found among the evaluated scanners. The mean deviation error was 57.40 ± 17.44 µm for the ultrasound scanner, 75.40 ± 41.43 µm for the laboratory scanner and 38.55 ± 24.34 µm for the intraoral scanner. The high-frequency ultrasound scanner showed similar trueness to optical scanners for digital implant impression.
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Xue, Song, Rui Guo, Karl Peter Bohn, Jared Matzke, Marco Viscione, Ian Alberts, Hongping Meng et al. « A cross-scanner and cross-tracer deep learning method for the recovery of standard-dose imaging quality from low-dose PET ». European Journal of Nuclear Medicine and Molecular Imaging 49, no 6 (24 décembre 2021) : 1843–56. http://dx.doi.org/10.1007/s00259-021-05644-1.

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Abstract Purpose A critical bottleneck for the credibility of artificial intelligence (AI) is replicating the results in the diversity of clinical practice. We aimed to develop an AI that can be independently applied to recover high-quality imaging from low-dose scans on different scanners and tracers. Methods Brain [18F]FDG PET imaging of 237 patients scanned with one scanner was used for the development of AI technology. The developed algorithm was then tested on [18F]FDG PET images of 45 patients scanned with three different scanners, [18F]FET PET images of 18 patients scanned with two different scanners, as well as [18F]Florbetapir images of 10 patients. A conditional generative adversarial network (GAN) was customized for cross-scanner and cross-tracer optimization. Three nuclear medicine physicians independently assessed the utility of the results in a clinical setting. Results The improvement achieved by AI recovery significantly correlated with the baseline image quality indicated by structural similarity index measurement (SSIM) (r = −0.71, p < 0.05) and normalized dose acquisition (r = −0.60, p < 0.05). Our cross-scanner and cross-tracer AI methodology showed utility based on both physical and clinical image assessment (p < 0.05). Conclusion The deep learning development for extensible application on unknown scanners and tracers may improve the trustworthiness and clinical acceptability of AI-based dose reduction.
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Burde, Alexandru Victor, Marius Manole, Radu-Septimiu Campian, Cosmin Sinescu et Sorana Baciu. « In vitro Comparison of Accuracy of Two Scanners Used in Dental Medicine ». Revista de Chimie 70, no 7 (15 août 2019) : 2344–46. http://dx.doi.org/10.37358/rc.19.7.7336.

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This experimental study aims to highlight and compare the resolution and accuracy (trueness and fidelity) of an intraoral scanner and a laboratory scanner. In order to achieve the aim of this study, an experimental model consisting of a die with a standard preparation for a porcelain-fused to metal crown was manufactured from a physiognomic polymethylmethacrylate resin. The experimental model was scanned with an industrial CT to obtain the virtual reference model. Then, the die was scanned 15 times with each scanner. In order to asses trueness, comparisons were made with the virtual reference model, and for fidelity, the first scan in the series was compared with the following scans. In regards to the trueness of the scanners, the average deviation for the laboratory scanner is 4.31 and 17.34 mm for the intraoral scanner. When comparing the serial scannings� of the same die, the lowest recorded deviation is 6.4 mm for the laboratory scanner and 21.57mm for the intraoral scanner. For both fidelity and trueness, the F test demonstrates that there is a statistically significant difference between the scanners and the applied T-tests confirm the lower degree of error-rate generation by the laboratory scanner. The dimensional limitations imposed for the intraoral scanners have a direct consequence on their trueness and fidelity when compared to their laboratory counterparts.
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Nestle, U., S. Kremp, D. Hellwig, A. Grgic, H. G. Buchholz, W. Mischke, C. Gromoll et al. « Multi-centre calibration of an adaptive thresholding method for PET-based delineation of tumour volumes in radiotherapy planning of lung cancer ». Nuklearmedizin 51, no 03 (2012) : 101–10. http://dx.doi.org/10.3413/nukmed-0452-11-12.

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SummaryPurpose: To evaluate the calibration of an adaptive thresholding algorithm (contrastoriented algorithm) for FDG PET-based delineation of tumour volumes in eleven centres with respect to scanner types and image data processing by phantom measurements. Methods: A cylindrical phantom with spheres of different diameters was filled with FDG realizing different signal-to-background ratios and scanned using 5 Siemens Biograph PET/CT scanners, 5 Philips Gemini PET/CT scanners, and one Siemens ECAT-ART PET scanner. All scans were analysed by the contrast-oriented algorithm implemented in two different software packages. For each site, the threshold SUVs of all spheres best matching the known sphere volumes were determined. Calibration parameters a and b were calculated for each combination of scanner and image-analysis software package. In addition, “scanner-typespecific” calibration curves were determined from all values obtained for each combination of scanner type and software package. Both kinds of calibration curves were used for volume delineation of the spheres. Results: Only minor differences in calibration parameters were observed for scanners of the same type (Δa ≤ 4%, Δb ≤ 14%) provided that identical imaging protocols were used whereas significant differences were found comparing calibration parameters of the ART scanner with those of scanners of different type (Δa ≤ 60%, Δb ≤ 54%). After calibration, for all scanners investigated the calculated SUV thresholds for auto-contouring did not differ significantly (all p > 0.58). The resulting sphere volumes deviated by less than –7% to +8% from the true values. Conclusion: After multi-centre calibration the use of the contrast-oriented algorithm for FDG PET-based delineation of tumour volumes in the different centres using different scanner types and specific imaging protocols is feasible.
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Jafri, Syed Riaz un Nabi, Sheraz Shamim, Sadia Muniza Faraz, Asif Ahmed, Syed Muhammad Yasir et Jamshed Iqbal. « Characterization and calibration of multiple 2D laser scanners ». PLOS ONE 17, no 7 (28 juillet 2022) : e0272063. http://dx.doi.org/10.1371/journal.pone.0272063.

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This paper presents the comparative evaluation of multiple compact and lightweight 2D laser scanners for their possible backpack based scanning and mapping applications. These scanners include Hokuyo URG-04LX, Slamtec RPLidar A1-M8 and Hokuyo UTM-30LX-EW scanners. Since the technical datasheets provide general information and limited working details, this research presents a thorough study on the performance of each scanner related explicitly to indoor mapping operations. A series of scanning experiments have been performed for the characterization of each scanner using statistical analysis. During the testing, all the scanning data has been recorded using Robot Operating System (ROS) and then computed in offline processing. In initial tests, each scanner’s drift effect on range measurements has been tested and presented in the relevant section of the paper. In continuation, the effect of various scanning distances on measurement accuracy has been evaluated and discussed. Later the impact of various materials typically found in indoor vicinities and their respective properties of color and smoothness have been tested and provided in the paper. Finally, a Kalman Filtering based mathematical formulation has been utilized to calibrate each scanner and to reduce the measuring uncertainties as observed in various tests for each scanner.
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Thèses sur le sujet "LE. Scanners"

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Lapin, O. S. « Fingerprint scanners ». Thesis, Сумський державний університет, 2012. http://essuir.sumdu.edu.ua/handle/123456789/28528.

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Bae, Kwang-Ho. « Automated registration of unorganised point clouds from terrestrial laser scanners ». Thesis, Curtin University, 2006. http://hdl.handle.net/20.500.11937/946.

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Laser scanners provide a three-dimensional sampled representation of the surfaces of objects. The spatial resolution of the data is much higher than that of conventional surveying methods. The data collected from different locations of a laser scanner must be transformed into a common coordinate system. If good a priori alignment is provided and the point clouds share a large overlapping region, existing registration methods, such as the Iterative Closest Point (ICP) or Chen and Medioni’s method, work well. In practical applications of laser scanners, partially overlapping and unorganised point clouds are provided without good initial alignment. In these cases, the existing registration methods are not appropriate since it becomes very difficult to find the correspondence of the point clouds. A registration method, the Geometric Primitive ICP with the RANSAC (GPICPR), using geometric primitives, neighbourhood search, the positional uncertainty of laser scanners, and an outlier removal procedure is proposed in this thesis. The change of geometric curvature and approximate normal vector of the surface formed by a point and its neighbourhood are used for selecting the possible correspondences of point clouds. In addition, an explicit expression of the position uncertainty of measurement by laser scanners is presented in this dissertation and this position uncertainty is utilised to estimate the precision and accuracy of the estimated relative transformation parameters between point clouds. The GP-ICPR was tested with both simulated data and datasets from close range and terrestrial laser scanners in terms of its precision, accuracy, and convergence region. It was shown that the GP-ICPR improved the precision of the estimated relative transformation parameters as much as a factor of 5.In addition, the rotational convergence region of the GP-ICPR on the order of 10°, which is much larger than the ICP or its variants, provides a window of opportunity to utilise this automated registration method in practical applications such as terrestrial surveying and deformation monitoring.
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Bae, Kwang-Ho. « Automated registration of unorganised point clouds from terrestrial laser scanners ». Curtin University of Technology, Department of Spatial Sciences, 2006. http://espace.library.curtin.edu.au:80/R/?func=dbin-jump-full&object_id=16596.

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Laser scanners provide a three-dimensional sampled representation of the surfaces of objects. The spatial resolution of the data is much higher than that of conventional surveying methods. The data collected from different locations of a laser scanner must be transformed into a common coordinate system. If good a priori alignment is provided and the point clouds share a large overlapping region, existing registration methods, such as the Iterative Closest Point (ICP) or Chen and Medioni’s method, work well. In practical applications of laser scanners, partially overlapping and unorganised point clouds are provided without good initial alignment. In these cases, the existing registration methods are not appropriate since it becomes very difficult to find the correspondence of the point clouds. A registration method, the Geometric Primitive ICP with the RANSAC (GPICPR), using geometric primitives, neighbourhood search, the positional uncertainty of laser scanners, and an outlier removal procedure is proposed in this thesis. The change of geometric curvature and approximate normal vector of the surface formed by a point and its neighbourhood are used for selecting the possible correspondences of point clouds. In addition, an explicit expression of the position uncertainty of measurement by laser scanners is presented in this dissertation and this position uncertainty is utilised to estimate the precision and accuracy of the estimated relative transformation parameters between point clouds. The GP-ICPR was tested with both simulated data and datasets from close range and terrestrial laser scanners in terms of its precision, accuracy, and convergence region. It was shown that the GP-ICPR improved the precision of the estimated relative transformation parameters as much as a factor of 5.
In addition, the rotational convergence region of the GP-ICPR on the order of 10°, which is much larger than the ICP or its variants, provides a window of opportunity to utilise this automated registration method in practical applications such as terrestrial surveying and deformation monitoring.
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Jagelid, Michelle. « Container Vulnerability Scanners : An Analysis ». Thesis, KTH, Skolan för elektroteknik och datavetenskap (EECS), 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-279967.

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Containers are rising in popularity as a technique for deploying services to cloud infrastructures. A Container image is a static format of a running container, storing all essential information needed to boot and run a container. Container images are often stored in repositories and widely shared among users. Container images stored on registries such as Docker Hub are shown to contain numerous known vulnerabilities.‌ This study investigates differences between containers and VMs, and why security tooling, such as known-vulnerability scanners, need to adapt. Further, we present necessary steps of a workflow when implementing container vulnerability scanners, along with problems and solutions to consider for each step. Finally, a comparison was conducted of two open-source scanners, Anchore and Clair. The tools were compared on 8 versions of common OS distributions. We show that there are differences between the two tools when scanning OS-packages. A majority of these differences likely appear because of definition disagreement. Disregarding definition disagreements, other differences are more likely due to implementation, but these differences are not large enough to be significant.
Containrar är en växande teknik för användning av applikationer i moln-infrastruktur. Container-avbildningar innehåller all information om exekveringsmiljön för en container och de sparas ofta i utvecklingskataloger. Dessa avbildningar delas frekvent mellan utvecklare. Container-avbildningar som sparas i utvecklingskataloger har visats innehålla flertalet kända sårbarheter. Denna studie undersöker funktionella skillnader och design-skillnader mellan containrar och virtuella maskiner och varför säkerhetsverktyg, så som kända-sårbarhetsskannrar, behöver anpassas. Utöver detta, identifieras ett arbetsflöde som behöver implementeras vid utveckling av säkerhets-skannrar för containrar. Till detta presenteras även problem och lösningar att tänka på för varje steg i flödet. Slutligen, utförs en jämförelse mellan två skannrar med öppen källkod, nämligen Anchore och Clair. Verktygen jämförs med 8 olika versioner av vanligt förekommande operativsystem-distributioner. Resultaten visade att det finns skillnader i utförande mellan de två jämförda verktygen när man fokuserar på installerade OS-paket. Majoriteten av olikheterna är troligtvis relaterade till en oenighet av definitioner av sårbarheter. Bortser man från dessa oenigheter, uppkommer andra olikheter troligtvis på grund av skillnader i implementeringen av de två verktygen. Dessa skillnader är dock inte stora nog för att vara signifikanta.
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Kongevold, Dimitry. « Merging Meshes from Different 3D Scanners ». Thesis, Norges teknisk-naturvitenskapelige universitet, Institutt for datateknikk og informasjonsvitenskap, 2013. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-23013.

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Creating digital representation of physical objects is becoming more and more popular as scanning technology becomes more available on the consumer marked. High precision close range scanners, based on structured light, can produce high precision meshes in short amount of time, while automated photogrammetric software can process images taken with ordinary cameras to re-create a three dimensional scenes. Unfortunately the quality of digitalization is bound to the volume of the captured scene, creating a trade of between quality and speed of acquisition. In this master thesis we present software that can merge the output of two different scanners to create a combined mesh with regions of different resolution. We propose two methods to identify corresponding regions in meshes and a variation of greedy triangulation algorithm. At the end we perform tests on combined meshes to assess the quality of merging and present the results.
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Menezes, Junior Luiz Ferreira. « Controle automatizado para scanners de luz ». [s.n.], 2004. http://repositorio.unicamp.br/jspui/handle/REPOSIP/264979.

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Orientador: Paulo Roberto Gardel Kurka
Dissertação (mestrado) - Universidade Estadual de Campinas, Faculdade de Engenharia Mecanica
Made available in DSpace on 2018-08-04T02:13:27Z (GMT). No. of bitstreams: 1 MenezesJunior_LuizFerreira_M.pdf: 3960270 bytes, checksum: 542b501adbaca7fc3d8ff80120fab0d3 (MD5) Previous issue date: 2004
Resumo: Este trabalho apresenta um método de controle automatizado de scanners de luz baseado no posicionamento dos projetores. É desenvolvida ainda uma estratégia de posicionamento dos focos de luz, através de acionamento sincronizado por sinais de áudio. Todos os modos de controle desenvolvidos são incorporados a um software de gerenciamento. No processo de controle toma-se necessário também a construção de uma interface de dados baseada no protocolo PC-DMX512. O trabalho contempla ainda uma descrição detalhada de tal protocolo e do hardware construído. O resultado final é ilustrado através de exemplos e do manual de operação do software de controle
Abstract: The work presents a method for automatically positioning of the light beam scanners. A strategy for synchronizing their positions based on the audio signals is also developed All control modes developed are incorporated into a managing system software. The controlling process requires the construction of a digital data interface to the hardware on the basis of the DMX512 protocol. The work includes a detailed description of the DMX512 protocol and the implemented hardware. Final results are illustrated through examples and operation manual
Mestrado
Mecanica dos Sólidos e Projeto Mecanico
Mestre em Engenharia Mecânica
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Persson, Lucas, et Sebastian Markström. « Indoor localization of hand-held Shopping Scanners ». Thesis, KTH, Data- och elektroteknik, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-208931.

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This thesis investigates applicable indoor navigation systems for the next generation of hand-held shopping scanners, on behalf of the company Virtual Stores. The thesis research and review applicable indoor localization methods and ways to combine and evaluate received localization data in order to provide accurate navigation without introducing any other worn equipment for a potential user. Prototype navigation systems was proposed, developed and evaluated using a combination of carefully placed radio transmitters that was used to provide radio based localization methods using Bluetooth or UltraWide Band (UWB) and inertial sensors combined with a particle filter. The Bluetooth solution was deemed incapable of providing any accurate localization method while the prototype using a combination of UWB and inertial sensors proved promising solution with below 1m average error under optimal conditions or 2.0m average localization error in a more realistic environment. However, the system requires the surveyed area to provide 3 or more UWB transmitters in the line of sight of the UWB receiver of the user at every location facing any direction to provide accurate localization. The prototype also requires to be scaled up to provide localization to more than 1 radio transmitters at the time before being introduced to the Fast moving consumer goods market.
Denna avhandling undersöker tillämpliga inomhusnavigationssystem för nästa generations handhållna shopping terminaler, på uppdrag av företaget Virtual Stores. Avhandlingen undersöker och granskar tillämpliga inomhuslokaliseringsmetoder och sätt att kombinera och utvärdera mottagna lokaliseringsdata för att bistå med ackurat navigering utan att introducera någon ytterligare utrustning för en potentiell användare. Prototypnavigationssystem föreslogs, utvecklades och utvärderades användandes en kombination av väl utplacerade radiosändare användandes Bluetooth eller UltraWide Band (UWB) och tröghetssensorer i kombination med ett partikelfilter. Bluetooth-lösningen ansågs oförmögen att tillhandahålla någon exakt lokalisering medan prototypen som använde en kombination av UWB och tröghetssensorer visade sig vara en lovande lösnings med under 1m genomsnittligt fel under optimala förhållanden eller 2,0m genomsnittligt lokaliseringsfel i mer realistisk miljö. Systemet kräver emellertid att det undersökta området tillhandahåller 3 eller fler UWB-sändare inom synfältet för UWB-mottagaren hos användaren vid varje plats och riktning för att tillhandahålla ackurat lokalisering. Prototypen behöver skalas upp för att kunna bistå med lokalisering till mer än 1 radiomottagare innan den introduceras till detaljhandlen.
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Bonjour, Philippe. « Criteres de choix des scanners a rayons x ». Aix-Marseille 2, 1990. http://www.theses.fr/1990AIX20852.

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Lee, Ki Sung. « Pragmatic image reconstruction for high resolution PET scanners / ». Thesis, Connect to this title online ; UW restricted, 2003. http://hdl.handle.net/1773/5967.

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González, Julio E. « A study of gray level recording capability for a reflective six bit desktop scanner / ». Online version of thesis, 1994. http://hdl.handle.net/1850/11289.

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Livres sur le sujet "LE. Scanners"

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Chris, Lorek, et Rouse Peter, dir. Scanners 3 : Putting scanners into practice. 4e éd. Hemel Hempstead, Herts, England : Argus Books, 1994.

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Scanners & printers. New York : Dorling Kindersley, 2001.

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Chambers, Mark L. Scanners for dummies. New York : Hungry Minds, 2001.

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Chambers, Mark L. Scanners For Dummies. New York : John Wiley & Sons, Ltd., 2004.

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Eisenson, Henry L. Scanners & secret frequencies. San Diego : Index Pub. Group, 1993.

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Chambers, Mark L. Scanners for dummies. 2e éd. Indianapolis, IN : Wiley Pub., 2004.

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Scanners for dummies. 2e éd. Hoboken, N.J : Wiley Pub., 2004.

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Desktop scanners : Image quality evaluation. Upper Saddle River, NJ : Prentice Hall, 1999.

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Wetzler, Fred U. Desktop image scanners and scanning. Silver Spring, MD : Association for Information and Image Management, 1989.

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Beale, Stephen. The scanner book : A complete guide to the use and applications of desktop scanners. Torrance, California : Micro Pub. Co., 1989.

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Chapitres de livres sur le sujet "LE. Scanners"

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Tucker, Charles J. « Scanners ». Dans Toxicogenomics, 81–95. Hoboken, NJ, USA : John Wiley & Sons, Inc., 2005. http://dx.doi.org/10.1002/0471669040.ch4.

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Kiong, Derek Beng Kee. « Lexical Scanners ». Dans Compiler Technology, 21–44. Boston, MA : Springer US, 1997. http://dx.doi.org/10.1007/978-1-4615-6077-7_3.

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Forrest, Andrew K. « Laser Scanners ». Dans Machine Vision Handbook, 329–54. London : Springer London, 2012. http://dx.doi.org/10.1007/978-1-84996-169-1_9.

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Gaussorgues, G. « Line Scanners ». Dans Infrared Thermography, 471–91. Dordrecht : Springer Netherlands, 1994. http://dx.doi.org/10.1007/978-94-011-0711-2_16.

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Sincerbox, Glenn. « Holographie Scanners ». Dans Laser Beam Scanning, 1–62. Taylor & Francis Group, 6000 Broken Sound Parkway NW, Suite 300, Boca Raton, FL 33487-2742 : CRC Press, 2017. http://dx.doi.org/10.4324/9780203749142-2.

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Sherman, Randy. « Polygonal Scanners ». Dans Laser Beam Scanning, 63–123. Taylor & Francis Group, 6000 Broken Sound Parkway NW, Suite 300, Boca Raton, FL 33487-2742 : CRC Press, 2017. http://dx.doi.org/10.4324/9780203749142-3.

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Abramovits, William. « MRI/CAT Scanners ». Dans Dermatological Cryosurgery and Cryotherapy, 139–40. London : Springer London, 2016. http://dx.doi.org/10.1007/978-1-4471-6765-5_30.

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Petrie, Gordon, et Charles K. Toth. « Terrestrial Laser Scanners ». Dans Topographic Laser Ranging and Scanning, 29–88. Second edition. | Boca Raton : Taylor & Francis, CRC Press, 2018. : CRC Press, 2018. http://dx.doi.org/10.1201/9781315154381-2.

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Solgaard, Olav. « Optical MEMS Scanners ». Dans Photonic Microsystems, 1–50. Boston, MA : Springer US, 2008. http://dx.doi.org/10.1007/978-0-387-68351-5_7.

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Beavers, W. I., et J. J. Eitter. « Fick Observatory Spectrum Scanners ». Dans Instrumentation and Research Programmes for Small Telescopes, 75–76. Dordrecht : Springer Netherlands, 1986. http://dx.doi.org/10.1007/978-94-010-9433-7_10.

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Actes de conférences sur le sujet "LE. Scanners"

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Xiang, L. Q., et Charles S. Ih. « Comparisons of different 2-D laser beam scanners ». Dans OSA Annual Meeting. Washington, D.C. : Optica Publishing Group, 1985. http://dx.doi.org/10.1364/oam.1985.tuo7.

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For many scanning applications, the scan line straightness, linearity, and influence of mechanical wobble and eccentricity on a scanner's performance are important. Some different 2-D scanners are compared on a common specification of a total resolution of 6.25 million pixels. According to our analyses, the polygon-mirror system offers the best straightness but is the most sensitive to mechanical wobble and eccentricity.1 Different holographic 2-D scanners are also investigated, and their performances depends strongly on design parameters and on the configurations. The scan line straightness of the grating scanner’s system is comparable with that of a polygon mirror.2 The scan line linearity of the scanner with an auxiliary reflector3 is the best one. The simplicity and therefore the expected reliability of holographic scanners may influence people to prefer holographic scanners. However many technical problems remain to be solved before holographic scanners can be widely used.
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Mukhtar, Moeed, Jonghyon Yi et George T. C. Chiu. « Color Registration Error Reduction in Document Scanner Using Iterative Velocity Command Synthesis ». Dans ASME 2008 Dynamic Systems and Control Conference. ASMEDC, 2008. http://dx.doi.org/10.1115/dscc2008-2225.

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Document scanners enjoy widespread use for converting hardcopy documents into digital images. Improving image quality is a key issue for scanner manufacturers. This paper proposes an ILC based step timing synthesis technique for reducing color registration error in stepper motor driven document scanners with no real-time feedback. To quantify color registration error, a line pattern image based technique is devised. Based on the measured color registration error signal, a single iteration convergent iterative learning control scheme is proposed to synthesize a stepper motor step timing command for the scan region. Reduction in color registration error is achieved by compensating for velocity fluctuations in the constant speed portion of the motion. Experimental results demonstrate the effectiveness of the proposed approach in reducing color registration error in scanned image.
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Ishihara, Shuichiro, Richard Jablonski et Takahiro Kubo. « Short-term Stability Measurement of Motor-driven Polygon Mirror Scanners in Laser Printers ». Dans The European Conference on Lasers and Electro-Optics. Washington, D.C. : Optica Publishing Group, 1996. http://dx.doi.org/10.1364/cleo_europe.1996.cwf52.

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Motor-driven polygon mirror scanners are commonly used for beam deflection in laser printers, digital copy machines, bar code readers, laser micrometers, etc. The performance of scanners highly effects the positioning accuracy of laser beam and thus the performance of OA equipment. In practice, the stability of laser scanners is determined by the accuracy of polygon mirror and its drive. At present, in low profile, low cost compact scanners, a motor-driven polygon mirror scanner with built-in drive control circuit is used, and its stability is estimated by the dynamic characteristics measurement equipment.
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Kuiper, Stefan, et Georg Schitter. « MIMO Self-Sensing Control of a Piezoelectric Tube Scanner ». Dans ASME 2009 Dynamic Systems and Control Conference. ASMEDC, 2009. http://dx.doi.org/10.1115/dscc2009-2785.

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Piezoelectric tube scanners are commonly used in Scanning Probe Microscopy (SPM) to provide the scanning motion of the tip or sample. Oscillations due to the weakly damped resonances of the scanner are a major source of image distortion in SPM-imaging. In this contribution, multiple input-multiple output (MIMO) self-sensing actuation of a piezoelectric tube scanner is presented, allowing to actively dampen the scanner oscillations. By connecting the tube scanner in a capacitive bridge-circuit, the piezoelectric tube is simultaneously used as a sensor and actuator. In order to enable the use of low-order decentralized controllers, the cross-talk between both axes is reduced by compensating for the capacitive coupling. The MIMO self-sensing actuation allows to actively dampen the scanner’s fundamental resonance by 18dB, while simultaneously reducing the resonance induced coupling by 30dB. Experimental results verify a significant reduction of the scanner oscillations in both positioning axes during fast scanning.
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Pike, Matthew, Richard Ramchurn et Max L. Wilson. « #Scanners ». Dans C&C '15 : Creativity and Cognition. New York, NY, USA : ACM, 2015. http://dx.doi.org/10.1145/2757226.2764546.

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Pike, Matthew, Max L. Wilson, Steve Benford et Richard Ramchurn. « #Scanners ». Dans CHI'16 : CHI Conference on Human Factors in Computing Systems. New York, NY, USA : ACM, 2016. http://dx.doi.org/10.1145/2851581.2889468.

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Pike, Matthew, Richard Ramchurn, Steve Benford et Max L. Wilson. « #Scanners ». Dans CHI'16 : CHI Conference on Human Factors in Computing Systems. New York, NY, USA : ACM, 2016. http://dx.doi.org/10.1145/2858036.2858276.

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Schmitz, Anne, et Davide Piovesan. « A Novel Methodology to Determine Optimal Active Marker Scanner Placement ». Dans ASME 2017 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2017. http://dx.doi.org/10.1115/imece2017-70285.

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Motion capture is a common technology used to measure human motion. One key aspect to collecting an ample amount of accurate data is maximizing the motion capture volume. This maximization is typically gone by a trial and error method. The purpose of this study was to develop a better method to determine the camera placement to maximize the captured volume. Two active marker scanners were methodically placed at various locations around a circle centered on a forceplate. The scanner placements of optimal coverage were defined as the position of the scanners when the area of overlap between the two scanners was maximum and the area of uncovered walkway at a minimum. The optimal placement of the scanners occurred when one scanner was placed at (−1.718, 2.459) meters with respect to the forceplate origin and the other positioned at (0.7691, −2.9) meters. Although these dimensions are specific to the constraints and walkway of our lab, the method can be adapted to any lab size. This setup is crucial to establish so accurate, un-occluded marker data can be collected in future studies.
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Kobayashi, Takeshi, Jiunnjye Tsaur et Ryutaro Maeda. « Development of 1D Optical Micro Scanner Driven by Piezoelectric Actuators ». Dans ASME 2005 Pacific Rim Technical Conference and Exhibition on Integration and Packaging of MEMS, NEMS, and Electronic Systems collocated with the ASME 2005 Heat Transfer Summer Conference. ASMEDC, 2005. http://dx.doi.org/10.1115/ipack2005-73431.

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1D optical micro scanners driven by piezoelectric actuators have designed, simulated, fabricated and tested. The newly designed micro scanners have a structure that rotation bars, hinges and PZT cantilevers support a square mirror (1mm × 1mm). Flat-structured micro scanners have been fabricated from Pt/PZT/Pt/Ti/SiO2/SOI(Si/SiO2/Si) multi-layered structure through conventional MEMS micro fabrication technologies. The micro scanner driven at 10 V showed an optical scan angle of 1.5 degree for the static actuation (60 Hz) and of 13 degree for the resonant actuation (4825 Hz), respectively.
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Escudero, Danilo Pereira, Ewerton R. Andrade et Routo Terada. « Estudo comparativo do módulo rastreador de scanners de vulnerabilidade web de código aberto ». Dans XVIII Escola Regional de Redes de Computadores. Sociedade Brasileira de Computação - SBC, 2020. http://dx.doi.org/10.5753/errc.2020.15205.

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Scanners de vulnerabilidades web auxiliam na detecção de vulnerabilidades em sistemas web de forma automatizada. Um scanner de vulnerabilidade web é dividido em três módulos: módulo rastreador, módulo atacante e módulo analisador. O módulo rastreador é um dos principais limitadores da eficácia apresentado pelos scanners, pois, se a ferramenta não é capaz de acessar todas as funcionalidades de um sistema web, muitas páginas vulneráveis não serão testadas. Este trabalho apresenta um estudo comparativo do módulo rastreador de scanners de código aberto, sugerindo adaptações para que sejam atingidos melhores resultados.
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Rapports d'organisations sur le sujet "LE. Scanners"

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Fuss, B. Investigation on Laser Scanners. Office of Scientific and Technical Information (OSTI), septembre 2004. http://dx.doi.org/10.2172/839971.

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Cagnon, Christopher, John Boone, Jerrold Bushberg, John DeMarco, Daniel Low, Michael McNitt-Gray, Anthony Seibert et Lynne Fairobent. Radiation Dose from Airport Scanners. AAPM, juin 2013. http://dx.doi.org/10.37206/145.

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Chancellor, T., et R. A. Morris. A comparison of film and phosphor scanners. Office of Scientific and Technical Information (OSTI), octobre 1993. http://dx.doi.org/10.2172/10191387.

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Lin, Pei-Jan Paul, Thomas J. Beck, Caridad Borras, Gerald Cohen, Robert A. Jucius, Robert J. Kriz, Edward L. Nickoloff et al. Specification and Acceptance Testing of Computed Tomography Scanners. AAPM, 1993. http://dx.doi.org/10.37206/38.

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Lee, R. L., A. W. Hyatt, A. G. Kellman, P. L. Taylor et C. J. Lasnier. Thermal deposition analysis during disruptions on DIII-D using infrared scanners. Office of Scientific and Technical Information (OSTI), décembre 1995. http://dx.doi.org/10.2172/459430.

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Gieske, J. H. Evaluation of scanners for C-scan imaging in nondestructive inspection of aircraft. Office of Scientific and Technical Information (OSTI), avril 1994. http://dx.doi.org/10.2172/10154046.

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Trajtenberg, Manuel. The Welfare Analysis of Product Innovations with an Application to CT Scanners. Cambridge, MA : National Bureau of Economic Research, octobre 1985. http://dx.doi.org/10.3386/w1724.

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Kessler, Mary E., et Brett R. Seeley. Predicting the Impact of Full Body Scanners on Air Travel and Passenger Safety. Fort Belvoir, VA : Defense Technical Information Center, juin 2010. http://dx.doi.org/10.21236/ada524616.

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Harrison, Catherine R., et Dennis B. Burnsides. A Method of Comparing 3-D Image Consistency and Quality Between Commercially Available 3-D Scanners. Fort Belvoir, VA : Defense Technical Information Center, janvier 2003. http://dx.doi.org/10.21236/ada430167.

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Hernandez-Rivera, Samuel P. Applications of Quantum Cascade Laser Scanners for Remote Detection of Chemical and Biological Threats and Weapons of Mass Destruction. Fort Belvoir, VA : Defense Technical Information Center, juillet 2014. http://dx.doi.org/10.21236/ada616228.

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