A Real Time 3d Surface Measurement System Using Projected Line Patterns
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A Real Time 3d Surface Measurement System Using Projected Line Patterns
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Author : Anqi Shen
language : en
Publisher:
Release Date : 2010
A Real Time 3d Surface Measurement System Using Projected Line Patterns written by Anqi Shen and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2010 with categories.
Real Time 3d Surface Shape Measurement Using Fringe Projection And System Geometry Constraints
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Author : Xinran Liu
language : en
Publisher:
Release Date : 2019
Real Time 3d Surface Shape Measurement Using Fringe Projection And System Geometry Constraints written by Xinran Liu and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2019 with Three-dimensional imaging categories.
Optical three-dimensional (3D) surface-shape measurement has diverse applications in engineering, computer vision and medical science. Fringe projection profilometry (FPP), uses a camera-projector system to permit high-accuracy full-field 3D surface-shape measurement by projecting fringe patterns onto an object surface, capturing images of the deformed patterns, and computing the 3D surface geometry. A wrapped phase map can be computed from the camera images by phase analysis techniques. Phase-unwrapping can solve the phase ambiguity of the wrapped phase map and permit determination of camera-projector correspondences. The object surface geometry can then be reconstructed by stereovision techniques after system calibration. For real-time 3D measurement, geometry-constraint based methods may be a preferred technique over other phase-unwrapping methods, since geometry-constraint methods can handle surface discontinuities, which are problematic for spatial phase unwrapping, and they do not require additional patterns, which are needed in temporal phase unwrapping. However, the fringe patterns used in geometry-constraint based methods are usually designed with a low frequency in order to maximize the reliability of correspondence determination. Although using high-frequency fringe patterns have proven to be effective in increasing the measurement accuracy by suppressing the phase error, high-frequency fringe patterns may reduce the reliability and thus are not commonly used. To address the limitations of current geometry-constraint based methods, a new fringe projection method for surface-shape measurement was developed using modulation of background and amplitude intensities of the fringe patterns to permit identification of the fringe order, and thus unwrap the phase, for high-frequency fringe patterns. Another method was developed with background modulation only, using four high-frequency phase-shifted fringe patterns. The pattern frequency is determined using a new fringe-wavelength geometry-constraint model that allows only two point candidates in the measurement volume. The correct corresponding point is selected with high reliability using a binary pattern computed from the background intensity. Equations of geometry-constraint parameters permit parameter calculation prior to measurement, thus reducing computational cost during measurement. In a further development, a new real-time 3D measurement method was devised using new background-modulated modified Fourier transform profilometry (FTP) fringe patterns and geometry constraints. The new method reduced the number of fringe patterns required for 3D surface reconstruction to two. A short camera-projector baseline allows reliable corresponding-point selection, even with high-frequency fringe patterns, and a new calibration approach reduces error induced by the short baseline. Experiments demonstrated the ability of the methods to perform real-time 3D measurement for a surface with geometric discontinuity, and for spatially isolated objects. Although multi-image FPP techniques can achieve higher accuracy than single-image methods, they suffer from motion artifacts when measuring dynamic object surfaces that are either moving or deforming. To reduce the motion-induced measurement error for multi-image FPP techniques, a new method was developed to first estimate the motion-induced phase shift errors by computing the differences between phase maps over a multiple measurement sequence. Then, a phase map with reduced motion-induced error is computed using the estimated phase shift errors. This motion-induced error compensation is computed pixel-wise for non-homogeneous surface motion. Experiments demonstrated the ability of the method to reduce motion-induced error in real-time, for real-time shape measurement of surfaces with high depth variation, and moving and deforming surfaces.
A Real Time Multi Sensor 3d Surface Shape Measurement System
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Author : Mohammad Al Sa'd
language : en
Publisher: LAP Lambert Academic Publishing
Release Date : 2011-10
A Real Time Multi Sensor 3d Surface Shape Measurement System written by Mohammad Al Sa'd and has been published by LAP Lambert Academic Publishing this book supported file pdf, txt, epub, kindle and other format this book has been release on 2011-10 with categories.
This book presents a state-of-the-art multi-sensor, 3D surface shape measurement system that is based upon fringe projection/analysis and which operates at speeds approaching real-time. The system provides the flexibility to choose from amongst several different fringe profilometry methods and the ability to manipulate their settings interactively. The system has a wide variety of potential applications, including Metrology Guided Radiotherapy, 3D modelling and visualisation, verbatim replication, and reverse engineering. This book provides a comprehensive framework for producing such a novel optical profilometry system, including the associated hardware and software structures, camera synchronisation, crosstalk reduction, and complete system integration. Also, it presents and illustrates the specific techniques that were developed to fulfil the requirements of various optical profilometry applications.
A Real Time Multi Sensor 3d Surface Shape Measurement System Using Fringe Analysis
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Author : Mohammad Saleh Al Sa'd
language : en
Publisher:
Release Date : 2011
A Real Time Multi Sensor 3d Surface Shape Measurement System Using Fringe Analysis written by Mohammad Saleh Al Sa'd and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2011 with categories.
Soft Computing Models In Industrial And Environmental Applications 5th International Workshop Soco 2010
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Author : Paulo Novais
language : en
Publisher: Springer Science & Business Media
Release Date : 2010-05-29
Soft Computing Models In Industrial And Environmental Applications 5th International Workshop Soco 2010 written by Paulo Novais and has been published by Springer Science & Business Media this book supported file pdf, txt, epub, kindle and other format this book has been release on 2010-05-29 with Technology & Engineering categories.
This volume of Advances in Intelligent and Soft Computing contains accepted - pers presented at SOCO 2010 held in the beautiful and historic city of Guimarães, Portugal, June 2010. The global purpose of SOCO conferences has been to provide a broad and - terdisciplinary forum for soft computing and associated paradigms, which are playing increasingly important roles in an important number of industrial and - vironmental applications fields. Soft computing represents a collection or set of computational techniques in machine learning, computer science and some engineering disciplines, which - vestigate, simulate and analyze very complex issues and phenomena. This wo- shop is mainly focused on its industrial and environmental applications. th SOCO 2010 is the 5 International Workshop on Soft Computing Models in Industrial Applications and provides interesting opportunities to present and d- cuss the latest theoretical advances and real world applications in this multidis- plinary research field. This volume presents the papers accepted for the 2010 edition, both for the main event and the Special Sessions. SOCO 2010 Special Sessions are a very u- ful tool in order to complement the regular program with new or emerging topics of particular interest to the participating community. Special Sessions that emp- size on multi-disciplinary and transversal aspects, as well as cutting-edge topics were especially encouraged and welcome. SOCO 2010 included a total of 3 Special Sessions: Ensemble Learning and - formation Fusion for Industrial Applications; Soft Computing for Service M- agement; Hybrid Intelligent Systems and Applications.
Real Time Weld Process Monitoring
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Author : Y M Zhang
language : en
Publisher: Elsevier
Release Date : 2008-04-17
Real Time Weld Process Monitoring written by Y M Zhang and has been published by Elsevier this book supported file pdf, txt, epub, kindle and other format this book has been release on 2008-04-17 with Technology & Engineering categories.
Welding is a complex process, is increasingly automated, and operates at higher speeds in more difficult environments. Defects also need to be detected as they arise to ensure efficient, high-quality production. All these needs have led to a growing interest in the use of sensors to provide accurate, robust, real-time monitoring where this cannot be achieved by more traditional testing and inspection techniques. This important book reviews the range of monitoring techniques available and their applications. After an introductory chapter, the first part of the book reviews the range of sensor technologies in welding, from arc and optical sensors to infrared and ultrasonic techniques. Part two discusses the monitoring of particular aspects of welding such as weld seams and profiles, the analysis of weld penetration and weld pool surface, as well as monitoring of resistance and laser welding. With its distinguished editor and international team of contributors, Real-time weld process monitoring is a valuable reference to all those concerned with improving the quality of welding and welded components. Reviews the range of monitoring techniques available Examines the range of sensor technologies in welding from arc and optical sensors to infrared and ultrasonic techniques Discusses the monitoring of specific aspects of welding such as weld seams, resistance and laser welding
Image Analysis And Processing Iciap 2011
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Author : Giuseppe Maino
language : en
Publisher: Springer
Release Date : 2011-09-15
Image Analysis And Processing Iciap 2011 written by Giuseppe Maino and has been published by Springer this book supported file pdf, txt, epub, kindle and other format this book has been release on 2011-09-15 with Computers categories.
The two-volume set LNCS 6978 + 6979 constitutes the proceedings of the 16th International Conference on Image Analysis and Processing, ICIAP 2011, held in Ravenna, Italy, in September 2011. The total of 121 papers presented was carefully reviewed and selected from 175 submissions. The papers are divided into 10 oral sessions, comprising 44 papers, and three post sessions, comprising 77 papers. They deal with the following topics: image analysis and representation; image segmentation; pattern analysis and classification;forensics, security and document analysis; video analysis and processing; biometry; shape analysis; low-level color image processing and its applications; medical imaging; image analysis and pattern recognition; image and video analysis and processing and its applications.
Computer Analysis Of Images And Patterns
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Author : Xiaoyi Jiang
language : en
Publisher: Springer Science & Business Media
Release Date : 2009-08-28
Computer Analysis Of Images And Patterns written by Xiaoyi Jiang and has been published by Springer Science & Business Media this book supported file pdf, txt, epub, kindle and other format this book has been release on 2009-08-28 with Computers categories.
This book constitutes the refereed proceedings of the bienially held International Conference on Computer Analysis of Images and Patterns, CAIP 2009, which took place in Münster, Germany, September 2-4, 2009. The 148 papers presented together with 2 invited talks were carefully reviewed and selected from 405 submissions. The papers are organized in topical section on: biometrics, calibration, document analysis, features, graph representations, image processing, image registration, image and video retrieval, medical imaging, object and scene recognition, pattern recognition, shape recovery, segmentation, stereo and video analysis, texture analysis, and applications.
Sensors And Techniques For 3d Object Modeling In Underwater Environments
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Author : Fabio Menna
language : en
Publisher: MDPI
Release Date : 2018-09-28
Sensors And Techniques For 3d Object Modeling In Underwater Environments written by Fabio Menna and has been published by MDPI this book supported file pdf, txt, epub, kindle and other format this book has been release on 2018-09-28 with Detectors categories.
This book is a printed edition of the Special Issue "Sensors and Techniques for 3D Object Modeling in Underwater Environments" that was published in Sensors
3d Biometrics
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Author : David Zhang
language : en
Publisher: Springer Science & Business Media
Release Date : 2013-05-31
3d Biometrics written by David Zhang and has been published by Springer Science & Business Media this book supported file pdf, txt, epub, kindle and other format this book has been release on 2013-05-31 with Computers categories.
Automatic personal authentication using biometric information is becoming more essential in applications of public security, access control, forensics, banking, etc. Many kinds of biometric authentication techniques have been developed based on different biometric characteristics. However, most of the physical biometric recognition techniques are based on two dimensional (2D) images, despite the fact that human characteristics are three dimensional (3D) surfaces. Recently, 3D techniques have been applied to biometric applications such as 3D face, 3D palmprint, 3D fingerprint, and 3D ear recognition. This book introduces four typical 3D imaging methods, and presents some case studies in the field of 3D biometrics. This book also includes many efficient 3D feature extraction, matching, and fusion algorithms. These 3D imaging methods and their applications are given as follows: - Single view imaging with line structured-light: 3D ear identification - Single view imaging with multi-line structured-light: 3D palmprint authentication - Single view imaging using only 3D camera: 3D hand verification - Multi-view imaging: 3D fingerprint recognition 3D Biometrics: Systems and Applications is a comprehensive introduction to both theoretical issues and practical implementation in 3D biometric authentication. It will serve as a textbook or as a useful reference for graduate students and researchers in the fields of computer science, electrical engineering, systems science, and information technology. Researchers and practitioners in industry and R&D laboratories working on security system design, biometrics, immigration, law enforcement, control, and pattern recognition will also find much of interest in this book.