Bibliographies thématiques / Triangulation-based laser scanning

Littérature scientifique sur le sujet « Triangulation-based laser scanning »

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Publié le 10 mars 2023

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Articles de revues sur le sujet "Triangulation-based laser scanning"

IBARAKI, Soichi, Yoshitomo KITAGAWA, Yoshihiro KIMURA et Shizuo NISHIKAWA. « 0203 Reduction of Measurement Error Induced by Laser Speckles in Scanning Operations using a Triangulation-based Laser displacement Sensor ». Proceedings of International Conference on Leading Edge Manufacturing in 21st century : LEM21 2015.8 (2015) : _0203–1_—_0203–4_. http://dx.doi.org/10.1299/jsmelem.2015.8._0203-1_.

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Tu, Dawei, Pan Jin et Xu Zhang. « Geometrical Model of Laser Triangulation System Based on Synchronized Scanners ». Mathematical Problems in Engineering 2019 (25 mars 2019) : 1–10. http://dx.doi.org/10.1155/2019/3503192.

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In traditional synchronized scanning system, the trajectory of the 3D scanning point is modeled as a circle when the thickness of rotated mirror is assumed to be zero. In this paper, a novel method to model the geometric measurement of synchronized scanning triangulation in the unfolded light path is proposed. Unlike most existing recent works, the 3D coordinate of the target is reasoned from the geometrical model, which includes all 14 system parameters. Further, the performance of the system precision can be analyzed and the importance of the thickness of rotated mirror is confirmed. In the experiment, a synchronized scanning system is developed. The experimental result demonstrates that the value of measurement uncertainty at a distance of 0.5m is 0.75mm and at a distance of 5m is 6.68mm. The standard deviations from the measurement point to the fitting plane at a distance of 0.5 m and 5 m are 1.10 mm and 19.73 mm, respectively.

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Comsa, Andrei, Inocentiu Maniu et Erwin Christian Lovasz. « Triangulation 3D Scanning Method in Biomedical Reconstruction ». Solid State Phenomena 166-167 (septembre 2010) : 145–48. http://dx.doi.org/10.4028/www.scientific.net/ssp.166-167.145.

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In this paper is presented the 3D acquisition and reconstruction process of complex geometry objects: two types of hip and cervical-cephalic prosthesis. The reconstruction process is based on triangulation single camera solution method with a 3D optical non-contact scanner which uses an emitted laser beam to sweep the object surfaces.

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Panov, Kirill, et Anatoly Borodin. « System of technical vision based on active laser triangulation method ». MATEC Web of Conferences 239 (2018) : 01003. http://dx.doi.org/10.1051/matecconf/201823901003.

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The number of failures, the percentage of faulty electric locomotives, and the number of unplanned repairs remain high at the enterprises for repair of traction rolling stock of the network of the main-line Russian railways. It was found that the main reasons for this situation are the unsatisfactory quality of current repairs and maintenance, the insufficient level of mechanization and automation of labor-intensive repair processes. The paper considers an existing positive example of the use of robotic equipment in assembly production for the repair of traction rolling stock. The analysis and classification of sensor control devices for industrial robots is performed. A method for controlling the driving devices of the repair equipment is proposed by obtaining a spatial-geometric image of the object’s surface before the beginning of technological processing by the method of active laser triangulation scanning. The principle of the action of three-dimensional scanning is described; a number of equipment with its technical characteristics and software used during the research in the laboratory of the university is listed. The result of the experiment of the proposed method on the model of the truck frame of the electric locomotive is presented. The metrological characteristics of the measurement results are calculated, allowing comparing and assessing the accuracy of the model obtained and the mock-up of the rolling stock truck. Based on the results of these calculations, it can be said with certainty that all errors and deviations of the results from true values lie within the limits of the norm and this technology can be used to design a vision system for robotic equipment.

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Li, Xiao Qin, Zhi Xiong Lu, Lan Ying Zhao, Zheng Hao Li, Bing Guo et Xue Feng Bai. « The Measurement of Three-Dimensional Road Roughness Based on Laser Triangulation ». Advanced Materials Research 346 (septembre 2011) : 812–16. http://dx.doi.org/10.4028/www.scientific.net/amr.346.812.

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This article did some non-contact measurement by laser triangulation principle on the A level hard road roughness, based on CCD imaging principle,used scanning galvanometer, which improved the measurement speed and surface measurement range, , drew the three-dimensional surface roughness profile curve by interpolation and fitting,It was in accordance with the standard range of A-road height spectrum. This measurement method have important guiding significance on the hard road roughness measurement and practice of the design of the relatively flat three-dimensional contours.

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Liu, Qi Fang. « Measuring Coaxiality with Optoelectronic and Non-Contact Based on Helical Scanning ». Advanced Materials Research 588-589 (novembre 2012) : 1002–5. http://dx.doi.org/10.4028/www.scientific.net/amr.588-589.1002.

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In view of the characteristic of the inefficiency on measuring coaxiality manually in industry, we put forward to studying on a laser triangulation san method[1] for measuring distance to measure coaxiality. It takes relative motion between the measurement thing and displacement laser sensor to implement helical scan motion and gain the data of spiral scanning projection based on step servo system by gyration and the axial feed. This method can improve manufacture efficiency and achieve the demand of online automatic testing. Finally, the way of implementation of this system would be discussed in this paper, meanwhile, it would provide simulation results of the method and actually feasibility analysis .

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van der Lucht, J., M. Bleier, F. Leutert, K. Schilling et A. Nüchter. « STRUCTURED-LIGHT BASED 3D LASER SCANNING OF SEMI-SUBMERGED STRUCTURES ». ISPRS Annals of Photogrammetry, Remote Sensing and Spatial Information Sciences IV-2 (28 mai 2018) : 287–94. http://dx.doi.org/10.5194/isprs-annals-iv-2-287-2018.

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In this work we look at 3D acquisition of semi-submerged structures with a triangulation based underwater laser scanning system. The motivation is that we want to simultaneously capture data above and below water to create a consistent model without any gaps. The employed structured light scanner consist of a machine vision camera and a green line laser. In order to reconstruct precise surface models of the object it is necessary to model and correct for the refraction of the laser line and camera rays at the water-air boundary. We derive a geometric model for the refraction at the air-water interface and propose a method for correcting the scans. Furthermore, we show how the water surface is directly estimated from sensor data. The approach is verified using scans captured with an industrial manipulator to achieve reproducible scanner trajectories with different incident angles. We show that the proposed method is effective for refractive correction and that it can be applied directly to the raw sensor data without requiring any external markers or targets.

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Altuntas, C. « TRIANGULATION AND TIME-OF-FLIGHT BASED 3D DIGITISATION TECHNIQUES OF CULTURAL HERITAGE STRUCTURES ». International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences XLIII-B2-2021 (28 juin 2021) : 825–30. http://dx.doi.org/10.5194/isprs-archives-xliii-b2-2021-825-2021.

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Abstract. This study aims to introduce triangulation and ToF measurement techniques used in three-dimensional modelling of cultural heritages. These measurement techniques are traditional photogrammetry, SfM approach, laser scanning and time-of-flight camera. The computer based approach to photogrammetric measurement that is named SfM creates dense point cloud data in a short time. It is low-cost and very easy to application. However traditional photogrammetry needs a huge effort for creating 3D wire-frame model. On the other hand active measurement techniques such as terrestrial laser scanner and time-of-flight camera have also been used in three-dimensional modelling for more than twenty years. Each one has specific accuracy and measurement effectiveness. The large or small structures have different characters, and require proper measurement configurations. In this study, after these methods are introduced, their superior and weak properties in cultural heritage modelling to make high accuracy, high density and labour and cost effective measurement.

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Huang, H., C. Hu, F. Zhang et H. Xue. « RESEARCH ON VISUALIZATION OF GROUND LASER RADAR DATA BASED ON OSG ». ISPRS - International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences XLII-3 (30 avril 2018) : 595–99. http://dx.doi.org/10.5194/isprs-archives-xlii-3-595-2018.

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Three-dimensional (3D) laser scanning is a new advanced technology integrating light, machine, electricity, and computer technologies. It can conduct 3D scanning to the whole shape and form of space objects with high precision. With this technology, you can directly collect the point cloud data of a ground object and create the structure of it for rendering. People use excellent 3D rendering engine to optimize and display the 3D model in order to meet the higher requirements of real time realism rendering and the complexity of the scene. OpenSceneGraph (OSG) is an open source 3D graphics engine. Compared with the current mainstream 3D rendering engine, OSG is practical, economical, and easy to expand. Therefore, OSG is widely used in the fields of virtual simulation, virtual reality, science and engineering visualization. In this paper, a dynamic and interactive ground LiDAR data visualization platform is constructed based on the OSG and the cross-platform C++ application development framework Qt. In view of the point cloud data of .txt format and the triangulation network data file of .obj format, the functions of 3D laser point cloud and triangulation network data display are realized. It is proved by experiments that the platform is of strong practical value as it is easy to operate and provides good interaction.

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Tu, Da Wei, Xu Zhang, Kai Fei et Xi Zhang. « Laser Stereo Vision-Based Position and Attitude Detection of Non-Cooperative Target for Space Application ». Advanced Materials Research 1039 (octobre 2014) : 242–50. http://dx.doi.org/10.4028/www.scientific.net/amr.1039.242.

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Vision measurement for non-cooperative targets in space is an essential technique in space counterwork, fragment disposal, satellite on-orbit service, spacecraft rendezvous, because the position and attitude of the target aircraft or the object should be detected first of all in the process. The 2D passive camera loses the depth information and can not measure the position and attitude of non-cooperative target. Several kinds of range imaging methods are alternatives. The traditional triangulation method can provide very high precision range measurement at close range but the nature of the triangulation geometry means that the uncertainty grows when the range increases. Laser radar (LIDAR) based on TOF (time of flight) or phase difference principle is suitable for middle and long range, but it can not fit for short range. A novel structure system is put forward, in which a so-called synchronous scanning triangulation method is adopted combining a LIDAR system. The synchronous scanning triangulation system plays a role at the range from 0.5m to 10m for object’s attitude, and the LIDAR system plays a role at the range from 10m to 200m for object’s position (direction and range).They are merged into one path, and do not influence each other because of using two different wavelengths respectively. This mechanism makes the system more compact and less weight. The system performances, such as the measurement range and precision, are analyzed according to the system parameters. The principle prototype is designed and established, and the experimental results confirm that its performance is promising and can satisfy the requirement for space application.

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Thèses sur le sujet "Triangulation-based laser scanning"

LIANG, JIN-WEI, et 梁晋瑋. « Implementation Of 3D Laser Scanning And Printing Based On Delaunay Triangulation ». Thesis, 2019. http://ndltd.ncl.edu.tw/handle/7d3qn6.

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碩士
國立聯合大學
電機工程學系碩士班
107
3D laser scanning and 3D printers are a very prosperous industry in recent years. There are a lot of related products in daily life. Not only can you print a model created by a laser scanning, but you can also design your own model and print it out. This paper will focus on how to use laser light to cast on the object to be measured, and use the camera to capture the laser light. By the rotation of the stepper motor, the contour of each angle of the object can be captured and recorded in points, and finally formed a point cloud. Then, using the Delaunay triangulation method, each point in the point cloud is connected to form a complete mesh for modeling. Finally, the scanned model is converted into an STL file that the 3D printer can support, and the complete 3D scanning system from 3D scanning to 3D printing is completed. This paper uses Windows as the working platform, equipped with Python programming language and OpenCV library, to calculate the physical size of the object to be measured by the correlated functions. Then Delaunay triangulation is employed to establish the physical model of the object. Because the most common 3D printer printing model format on the market is the STL file, and the format of the STL file is a combination of a large number of triangles, therefore, the model created by the Delaunay triangulation can be directly converted into the STL file, and sent to a 3D printer for printing. Keyword：Laser scanning, 3D printer, Python, OpenCV, Delaunay triangulation,STL file

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CINI, DANIELA. « Optical sensing technologies for the generation of reality-based 3D models of Cultural Heritage artifacts ». Doctoral thesis, 2012. http://hdl.handle.net/2158/797869.

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The central theme of the thesis is the use of triangulation laser scanning and other optical three-dimensional surveying systems for the realization of 3D models of objects of historical and artistic interest - sculptures, archaeological finds, decorative elements in architecture. The subject is faced keeping in mind the purposes and needs the models should or could meet, and which are the challenging steps to become a more common tool. To name one, a fundamental aspect is bridging gaps between technology providers and Cultural Heritage practitioners. Research for new functional applications is directed, for instance, towards the development of models as visual reference bases for data of various provenance, or as part of more effective, interactional and/or immersive outreach programs. Technologies and procedures for data acquisition and processing are extensively analyzed both under a general view of the state of the art and of national and international authoritative undertakings, and within the scopes of two hands-on applications, planned and carried out during the PhD course, for documentation and communication in archaeological and art-curatorial panoramas: - The MUSINT project, which has reunited in a Web-based interactive exploration system several Aegean and Cypriot collections held by Tuscan archaeological museums, and has a strong point in the possibility of viewing a high number of 3D models; the other outcome is the prospect for specialists to examine off-line the high-resolution versions. - The Martelli project, which is aimed to support the visit to a distinguished Florentine house-museum and its art-collection with personalized multimedia itineraries and 3D engagement (with also a solid model), reconnecting threads between art-works belonged to the noble family and sources of historical evidence, and between both of them and real spaces. The projects described are presented after giving a detailed review of relevant and still open matters in the specific field of application, either practical or theoretical ones: orientation through suggested best practices and shared guidelines, definition of standards and validation procedures, sharing in / access to centralized archives of 3D data, archiving file formats and media, and so on. The case-studies have given the opportunity to apply referential principles and share an optimized methodology to create 3D content in similar projects, taking in account a great variety of objects and divergent interests. The many 3D models created for the above-mentioned projects are evaluated considering various criteria highlighted while going in-depth in the concept of “quality” (a few even diametrically different), as: the measurement performance of the surveying systems in relation to different shape features, sizes, materials, set conditions; the apparent trueness resulting from mesh and texture processing operations and from final adaptation in the visualization system; the level of information transparency given to the end-user through appropriate metadata; the long-term usability of data archived at intermediate stages; the easiness of use; the degree of interaction allowed by the final infrastructure, etc. These factors can change and, in different combinations, influence the assessment, depending on the end-user of the system the models are included in. Yet, quality can be consistently read as the extent to which models actually represent and convey what they claim to. Basically, a high-quality 3D model should improve the capability to study and work on an object for art-historical research and conservation purposes and also to communicate better all the information that a direct view can’t transmit, enhancing the user’s experience and participation. As all high-tech solutions, 3D model and interactive environments are to be preferred only to the extent they are efficient in conveying content, and not in themselves.

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Chapitres de livres sur le sujet "Triangulation-based laser scanning"

Baek, Seung-Hae, et Soon-Yong Park. « A 3-D Tube Scanning Technique Based on Axis and Center Alignment of Multi-laser Triangulation ». Dans Advanced Concepts for Intelligent Vision Systems, 724–35. Berlin, Heidelberg : Springer Berlin Heidelberg, 2011. http://dx.doi.org/10.1007/978-3-642-23687-7_65.

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Wallace, Andrew M. « Three-Dimensional Laser Imaging in an Archaeological Context ». Dans Images and Artefacts of the Ancient World. British Academy, 2005. http://dx.doi.org/10.5871/bacad/9780197262962.003.0010.

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This chapter discusses the strengths and weaknesses of techniques of 3D laser imaging based on time of flight and triangulation. Laser scanning by triangulation is a fully developed technology. Through this method, it is now possible to create faithful 3D datasets from a reasonable range of surface materials. However, laser scanning has some certain drawbacks, restricting their universal applicability. For surfaces with concavities or with intricate details, occlusion may occur due to the necessary separation of the viewpoint between the viewing camera and the laser projector. In addition, the data may be corrupted by false and poor returns caused by variable material reflectance. In the time of flight system, the distance is measured by measuring the time for a focused laser beam to impact on and return from the surface of interest. In this method, the distance is computed and a 3D image can be created if the laser beam is scanned across the target. Although, the time of flight method is a more attractive alternative as it eliminates occlusion, it has disadvantages as well. The time resolution necessary to measure the range to sub-millimetre accuracy is difficult to achieve and the measured time is also affected by the magnitude of the returned signal. In addition to reviewing the pros and cons of this current technology, the chapter also discusses the development of a new approach to time-of-flight laser imaging based on time-correlated single photon counting. This new method has various advantages compared to the old methods. It has the ability to make 3D measurements on distance, poorly reflecting or transparent surfaces.

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Ivanov, Mykhailo, Lars Lindner, Oleg Sergiyenko, Julio Cesar Rodríguez-Quiñonez, Wendy Flores-Fuentes et Moises Rivas-Lopez. « Mobile Robot Path Planning Using Continuous Laser Scanning ». Dans Optoelectronics in Machine Vision-Based Theories and Applications, 338–72. IGI Global, 2019. http://dx.doi.org/10.4018/978-1-5225-5751-7.ch012.

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The main object of this book chapter is an introduction and presentation of mobile robot path planning using continuous laser scanning, which has significant advantages compared with discrete laser scanning. A general introduction to laser scanning systems is given, whereby a novel technical vision system (TVS) using the dynamic triangulation measurement method for 3D coordinate determination is found suitable for accomplishing this task of mobile robot path planning. Furthermore, methods and algorithms for mobile robot road maps and path planning are presented and compared.

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Actes de conférences sur le sujet "Triangulation-based laser scanning"

Wang, Xiao, Xianfeng Huang, Fulin Bian et Jun Sun. « 3D triangulation of terrestrial laser scanning data based on spherical projection ». Dans Geoinformatics 2007, sous la direction de Manchun Li et Jiechen Wang. SPIE, 2007. http://dx.doi.org/10.1117/12.759480.

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Basaca-Preciado, Luis C., Oleg Yu Sergiyenko, Julio C. Rodriguez-Quinonez et Moises Rivas-Lopez. « Optoelectronic 3D laser scanning technical vision system based on dynamic triangulation ». Dans 2012 IEEE Photonics Conference (IPC). IEEE, 2012. http://dx.doi.org/10.1109/ipcon.2012.6358788.

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Wagner, Benjamin, Patrick Stuber, Tobias Wissel, Ralf Bruder, Achim Schweikard et Floris Ernst. « Ray interpolation for generic triangulation based on a galvanometric laser scanning system ». Dans 2015 IEEE 12th International Symposium on Biomedical Imaging (ISBI 2015). IEEE, 2015. http://dx.doi.org/10.1109/isbi.2015.7164142.

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Franca, J. G. D. M., M. A. Gazziro, A. N. Ide et J. H. Saito. « A 3D scanning system based on laser triangulation and variable field of view ». Dans 2005 International Conference on Image Processing. IEEE, 2005. http://dx.doi.org/10.1109/icip.2005.1529778.

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Alciatore, David G., et Ronald M. Pasquini. « Variable Focus Three-Dimensional Laser Digitizing System ». Dans ASME 1995 15th International Computers in Engineering Conference and the ASME 1995 9th Annual Engineering Database Symposium collocated with the ASME 1995 Design Engineering Technical Conferences. American Society of Mechanical Engineers, 1995. http://dx.doi.org/10.1115/cie1995-0837.

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Abstract This paper describes a new three-dimensional scanning technology which is being developed at Colorado State University. Unlike other laser-based scanners which use active or passive triangulation to obtain surface range data, the new variable focus laser digitizing system (VFLDS) uses the principles of optical focal length to measure surface range data. This system should represent a significant step forward in speed and simplicity over current laser-based single point digitizing systems while retaining all of their advantages. The goal of the initial research presented here is to produce preliminary results which will prove the viability of this new approach.

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Legnani, Giovanni, Andrea Gabrielli, Abdelmajid Ousdad, Irene Fassi, Serena Ruggeri et Gianmauro Fontana. « A Laser Calibration Device for Mini Robots ». Dans ASME 2015 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. American Society of Mechanical Engineers, 2015. http://dx.doi.org/10.1115/detc2015-46241.

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The paper describes a new laser device conceived for surface scanning and more specifically for mini robot calibrations. The system is based on a laser triangulation sensor which is moved by an extremely accurate device to collect a set of 3D points lying on surfaces. If the surfaces belong to the gripper of a robot that must be calibrated and a sufficient number of points of this gripper are collected, the pose of the robot can be measured. If the robot is moved to several different configurations and the gripper poses are measured for each of them, it is possible to reconstruct the kinematics of the robot and calibrate it. The paper presents the theory and describes the design, tests and calibration of the laser instrumentation with a focus on the first experimental results. These results are obtained in a working cell including a vision system, a 4-dof (xyz,θ) mini robot and a 2-dof rotating platform.

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Zheng, Yi, et Beiwen Li. « Uniaxial High-Speed Micro-Scale 3D Surface Topographical Measurements Using Fringe Projection ». Dans ASME 2020 15th International Manufacturing Science and Engineering Conference. American Society of Mechanical Engineers, 2020. http://dx.doi.org/10.1115/msec2020-8303.

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Abstract In-situ inspection has drawn many attentions in manufacturing due to the importance of quality assurance. With the rapid growth of additive manufacturing technology, the importance of in-line/in-situ inspections has been raised to a higher level due to many uncertainties that could occur during an additive printing process. Given this, having accurate and robust in-situ monitoring can assist corrective actions for a closed-loop control of a manufacturing process. Contact 3D profilometers such as stylus profilometers or coordinate measuring machines can achieve very high accuracies. However, due to the requirement for physical contact, such methods have limited measurement speeds and may cause damage to the tested surface. Thus, contact methods are not quite suitable for real-time in-situ metrology. Non-contact methods include both passive and active methods. Passive methods (e.g., focus variation or stereo vision) hinges on image-based depth analysis, yet the accuracies of passive methods may be impacted by light conditions of the environment and the texture quality of the surface. Active 3D scanning methods such as laser scanning or structured light are suitable for instant quality inspection due to their ability to conduct a quick non-contact 3D scan of the entire surface of a workpiece. Specifically, the fringe projection technique, as a variation of the structured light technique, has demonstrated significant potential for real-time in-situ monitoring and inspection given its merits of conducting simultaneous high-speed (from 30 Hz real-time to kilohertz high speeds) and high accuracy (tens of μm) measurements. However, high-speed 3D scanning methods like fringe projection technique are typically based on triangulation principle, meaning that the depth information is retrieved by analyzing the triangulation relationship between the light emitter (i.e., projector), the image receiver (i.e., camera) and the tested sample surface. Such measurement scheme cannot reconstruct 3D surfaces where large geometrical variations are present, such as a deep-hole or a stair geometry. This is because large geometrical variations will block the auxiliary light used in the triangulation based methods, which will resultantly cause a shadowed area to occur. In this paper, we propose a uniaxial fringe projection technique to address such limitation. We measured a stair model using both conventional triangulation based fringe projection technique and the proposed method for comparison. Our experiment demonstrates that the proposed uniaxial fringe projection technique can perform high-speed 3D scanning without shadows appearing in the scene. Quantitative testing shows that an accuracy of 35 μm can be obtained by measuring a step-height object using the proposed uniaxial fringe projection system.

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