Construction And Error Analysis Of A Fringe Projection System
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Construction And Error Analysis Of A Fringe Projection System
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Author : Daryl Purcell
language : en
Publisher:
Release Date : 2005
Construction And Error Analysis Of A Fringe Projection System written by Daryl Purcell and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2005 with categories.
Moiré fringe projection techniques are gaining popularity due to their non-contact nature and high accuracy in measuring the surface shape of many objects. All such instruments use phase algorithms to reconstruct the surface, with the accuracy dependent on many factors. In an effort to better understand the limitations of moiré fringe projection techniques, a detailed uncertainty analysis is investigated on a constructed moiré fringe projection system for static objects. In addition, a calibration process is presented which produces an equivalent wavelength map, which takes into account the variation of the equivalent wavelength over the field of view for a divergent system. This includes the use of a calibration artifact to check the calibration process for a detailed analysis of the systematic biases. Lastly, the moiré fringe projection system was adapted to measure the vibrational amplitude of a thin-walled part while it was being machined. The system utilizes an inexpensive super-bright LED as a light source, which allows the system to strobe a dynamic object to measure the surface shape at an arbitrary phase of the vibration cycle.
Adaptive Fringe Projection And Error Compensated Calibration For Compact Three Dimensional Shape Measurement Systems
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Author : Dong Li
language : en
Publisher:
Release Date : 2014
Adaptive Fringe Projection And Error Compensated Calibration For Compact Three Dimensional Shape Measurement Systems written by Dong Li and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2014 with categories.
Measurement of the three-dimensional (3-D) shape of an object is needed for both industrial and consumer applications. In industrial applications, compact measurement systems are needed to accomplish certain tasks such as measuring an interior surface in a confined space. In consumer applications, compact measurement systems are also needed for common consumers to conveniently get access to 3D data for a wide range of everyday uses. Fringe-projection techniques have been increasingly used for 3D shape measurement due to the advantage of dense full-field measurement. For a camera-projector measurement system, system geometry (the relative camera-projector position and angle) determine the system compactness. Analysis of the relation of system geometry to measurement accuracy is challenging owing to the effect of the various factors that vary with system geometry on measurement accuracy. It is thus necessary to experimentally determine how measurement accuracy varies with system geometry, in order to determine the most compact design that satisfies a desired measurement accuracy. This has been achieved in a compactness study, in which the measurement accuracy is evaluated at different relative camera-projector positions and angles. Measurement results in the compactness study have shown that there is a tradeoff in loss of accuracy for increased compactness and loss of compactness for increased accuracy. The smallest camera-projector angle (for an industrial system) or the smallest physical distance between the camera and projector (for a consumer system) that satisfies the desired accuracy would provide the most compact design. Several new methods including 1) an improved heterodyne phase-unwrapping method, 2) an adaptive fringe-pattern projection (AFPP) method for surfaces of high variation in reflectivity and illumination, and 3) a pixel-wise adaptive fringe-pattern projection (PWAFPP) method for such surfaces, have been developed in this research to improve measurement accuracy, thus contributing to enable a more compact system design to achieve a desired measurement accuracy. First, the new improved heterodyne phase-unwrapping method detects and compensates for the spike-like errors in absolute phase maps. The method has demonstrated improved projector calibration accuracy from 18.2 to 0.2 pixels, thus ensuring usable camera-projector stereovision system calibration for 3D measurement. Second, the new AFPP method adapts the projector maximum input gray levels (MIGLs) to local surface reflectivity using only two prior fringe-pattern projection and image-capture rounds. The method demonstrated greatly improved 3D measurement accuracy by avoiding image saturation in highly-reflective surface regions while maintaining high intensity modulation of captured fringe patterns across the entire surface with large range in reflectivity. Third, the new PWAFPP method projects a MIGL adapted to the surface reflectivity and illuminance for each pixel. The method has demonstrated a 34% root-mean-square (RMS) error reduction in 3D measurement for pixels that remained saturated after applying the AFPP method. The new method can thus be used to measure surfaces with more complex variation in surface reflectivity.
Optical Mems
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Author : Huikai Xie
language : en
Publisher: MDPI
Release Date : 2019-08-06
Optical Mems written by Huikai Xie and has been published by MDPI this book supported file pdf, txt, epub, kindle and other format this book has been release on 2019-08-06 with Technology & Engineering categories.
This book is a printed edition of the Special Issue Optical MEMS that was published in Micromachines
Sheet Bulk Metal Forming
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Author : Marion Merklein
language : en
Publisher: Springer
Release Date : 2020-11-05
Sheet Bulk Metal Forming written by Marion Merklein and has been published by Springer this book supported file pdf, txt, epub, kindle and other format this book has been release on 2020-11-05 with Technology & Engineering categories.
This book presents the findings of research projects from the Transregional Collaborative Research Centre 73. These proceedings are the result of years of research into sheet–bulk metal forming. The book discusses the challenges posed by simulating sheet–bulk metal forming. It takes into account the different phenomena characteristic to both sheet and bulk forming fields, and explores the demands this makes on modelling the processes. It then summarizes the research, and presents from a practitioner's point of view. This means the book is of interest to and helps both academics and industrial engineers within the field of sheet–bulk metal forming.
Springer Handbook Of Experimental Solid Mechanics
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Author : William N. Sharpe, Jr.
language : en
Publisher: Springer Science & Business Media
Release Date : 2008-12-04
Springer Handbook Of Experimental Solid Mechanics written by William N. Sharpe, Jr. 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 2008-12-04 with Mathematics categories.
The Springer Handbook of Experimental Solid Mechanics documents both the traditional techniques as well as the new methods for experimental studies of materials, components, and structures. The emergence of new materials and new disciplines, together with the escalating use of on- and off-line computers for rapid data processing and the combined use of experimental and numerical techniques have greatly expanded the capabilities of experimental mechanics. New exciting topics are included on biological materials, MEMS and NEMS, nanoindentation, digital photomechanics, photoacoustic characterization, and atomic force microscopy in experimental solid mechanics. Presenting complete instructions to various areas of experimental solid mechanics, guidance to detailed expositions in important references, and a description of state-of-the-art applications in important technical areas, this thoroughly revised and updated edition is an excellent reference to a widespread academic, industrial, and professional engineering audience.
Advances In Image And Graphics Technologies
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Author : Tieniu Tan
language : en
Publisher: Springer
Release Date : 2015-06-16
Advances In Image And Graphics Technologies written by Tieniu Tan and has been published by Springer this book supported file pdf, txt, epub, kindle and other format this book has been release on 2015-06-16 with Computers categories.
This book constitutes the refereed proceedings of the 10th Chinese Conference on Advances in Image and Graphics Technologies, IGTA 2015, held in Beijing, China, in June 2015. The 50 papers presented were carefully reviewed and selected from 138 submissions. They provide a forum for sharing new aspects of the progresses in the areas of image processing technology, image analysis und understanding, computer vision and pattern recognition, big data mining, computer graphics and VR, image technology application.
Computer Vision Systems
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Author : Ming Liu
language : en
Publisher: Springer
Release Date : 2017-10-10
Computer Vision Systems written by Ming Liu and has been published by Springer this book supported file pdf, txt, epub, kindle and other format this book has been release on 2017-10-10 with Computers categories.
This book constitutes the refereed proceedings of the 11th International Conference on Computer Vision Systems, ICVS 2017, held in Shenzhen, China, in July 2017. The 61 papers presented were carefully reviewed and selected from 92 submissions. The papers are organized in topical sections on visual control, visual navigation, visual inspection, image processing, human robot interaction, stereo system, image retrieval, visual detection, visual recognition, system design, and 3D vision / fusion.
Optical Engineering
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Author :
language : en
Publisher:
Release Date : 2004
Optical Engineering written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2004 with Optical instruments categories.
Publishes papers reporting on research and development in optical science and engineering and the practical applications of known optical science, engineering, and technology.
Asme Technical Papers
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Author :
language : en
Publisher:
Release Date : 1996
Asme Technical Papers written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1996 with Mechanical engineering categories.
High Sensitivity Moir
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Author : Daniel Post
language : en
Publisher: Springer Science & Business Media
Release Date : 2012-12-06
High Sensitivity Moir written by Daniel Post 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 2012-12-06 with Technology & Engineering categories.
A description of both the theory and practice of physical measurements that use high-sensitivity moiré - principally moiré interferometry. The focus here is on the mechanics and micromechanics of materials and structural elements and the book includes new studies published for the first time. Diverse fields are addressed: advanced composite materials, thermal stresses, electronic packaging, fracture, metallurgy, time-dependence, strain gage calibration. All the methods can be applied for whole-field measurements on nearly and solid bodies. This reader-friendly book will serve engineers and scientists who are concerned with measurements of real phenomena, while also stimulating students to pursue the treasures of experimental analysis.