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Position Determination of a Robot End-Effector Using a 6D-Measurement System Based on the Two-View Vision

Alexej Janz, Christian Pape, Eduard Reithmeier
2013 Open Journal of Applied Sciences  
Then we apply the epipolar geometry to describe the relationship between two cameras and calibrate them as a stereo vision system.  ...  We start with the description of the operational concept and components of the measurement system.  ...  of a robotic system, which is able to manipulate micro-objects with an accuracy of 1 -2 micrometers in a 3D-workspace of 10 cubic millimeters.  ... 
doi:10.4236/ojapps.2013.37049 fatcat:vkugvasf7jdrbnwaxrgxhfofdy

Microscopic Three-Dimensional Measurement Based on Telecentric Stereo and Speckle Projection Methods

Kepeng Chen, Tielin Shi, Qiang Liu, Zirong Tang, Guanglan Liao
2018 Sensors  
For the dimension in several millimeters together with the accuracy at sub-pixel or sub-micron level, there is almost no effective measurement method now.  ...  Then two Mitutoyo step masters have been used for further verification.  ...  Acknowledgments: The authors sincerely thank the Micro and Nano Fabrication and Measurement Laboratory of School of Mechanical Science and Engineering in HUST.  ... 
doi:10.3390/s18113882 pmid:30423883 fatcat:quutvys7cncvxeajrtvtfeybom

Front Matter: Volume 10827

Yingjie Yu, Chao Zuo, Kemao Qian
2018 Sixth International Conference on Optical and Photonic Engineering (icOPEN 2018)  
stereo images [10827-79] 10827 0Y A new phase retrieve method for phase shifting profilometry with object in motion [10827-119] 10827 0Z An accurate hand-eye calibration algorithm with global optimization  ...  of telecentric cameras with distortion center estimation [10827-81] 10827 21 Spatial color-encoded phase-shifting technique for phase measuring deflectometry [10827-93] 10827 22 Simulation of the  ... 
doi:10.1117/12.2507319 fatcat:wq7dsf5dzfhnxoe7l3gk2o6ckq

Design and Implementation of a Custom Built Optical Projection Tomography System

Michael D. Wong, Jun Dazai, Johnathon R. Walls, Nicholas W. Gale, R. Mark Henkelman, James P. Brody
2013 PLoS ONE  
coupled with objective lenses of high numerical aperture, increasing the resolution of the images.  ...  Included is a hardware parts list, instructions for assembly, a description of the acquisition software and a free download site, and methods for calibration.  ...  Micro-CT can obviously detect malformations in bone structure [5] and with the development of iodine based contrast agents, micro-CT can produce images with surprisingly good soft tissue contrast, extending  ... 
doi:10.1371/journal.pone.0073491 pmid:24023880 pmcid:PMC3762719 fatcat:m6cesgh5czaa7lrd6akei24tka

Advances and Prospects of Vision-Based 3D Shape Measurement Methods

Guofeng Zhang, Shuming Yang, Pengyu Hu, Huiwen Deng
2022 Machines  
This paper mainly focuses on state-of-the-art vision-based methods that can perform 3D shape measurement with high precision and high resolution.  ...  Finally, the advances of, and the prospects for, further improvement of vision-based 3D shape measurement techniques are proposed.  ...  We proposed a system calibration method [59] and an error compensation method [60] for galvanometric laser scanning system, which achieved an average error of 0.05 mm in measuring two standard balls  ... 
doi:10.3390/machines10020124 fatcat:ws3pbwv6wzcole5jtca35c5fjm

Single exposure three-dimensional imaging of dusty plasma clusters

Peter Hartmann, István Donkó, Zoltán Donkó
2013 Review of Scientific Instruments  
ACKNOWLEDGMENTS This work was supported by the Hungarian Fund for Scientific Research (OTKA) through grants K77653, IN85261, K105476, NN103150.  ...  specific point (u, v) of the objective lens and impacted a specific micro-lens with coordinates (s, t).  ...  The need for accurate three-dimensional imaging was recognized soon after, when microgravity experiments started in space 4,5 , on parabolic flights 6 , as well as with the discovery of Coulomb balls 7  ... 
doi:10.1063/1.4789770 pmid:23464205 fatcat:mqny7lrfqvbf3edmaptn6h5vxm

An invisible-stylus-based coordinate measurement system via scaled orthographic projection

Joshua A. Gordon, Steven S. Borenstein
2019 Precision engineering  
We describe this system using multi-view geometry vision theory and present proof of concept measurement examples of 2-D and 3-D objects.  ...  In the current configuration, system resolution and accuracy better than 20 μm is demonstrated on objects in the meso/micro scale that are well below the range of a laser tracker alone.  ...  Acknowledgments The authors would like to thank William Hoff of the Colorado School of Mines for helpful discussions on machine vision, Bala Muralikrishnan, Meghan Shilling, and Daniel Sawyer of NIST for  ... 
doi:10.1016/j.precisioneng.2018.12.002 fatcat:jxdd7wszz5axzn5pobxw6pjkgm

An INSPECT Measurement System for Moving Objects

Fuqin Deng, Chang Liu, Wuifung Sze, Jiangwen Deng, Kenneth S. M. Fung, Edmund Y. Lam
2015 IEEE Transactions on Instrumentation and Measurement  
In this paper, we report on an imaging and numerical surface profilometry with error compensation technology (INSPECT) measurement system that is tailored for moving objects.  ...  However, this method cannot be directly applied to systems involving moving objects, as the translation and the perspective geometry effect manifest as errors in the height calculations.  ...  To reduce the perspective projection effect, we can use a telecentric system by design, but the bulky size of the telecentric system is not suitable for applications in the semiconductor inspection and  ... 
doi:10.1109/tim.2014.2329387 fatcat:dxym2fnkirg2hb7xgyrnhmmo7y

Three-Dimensional Shape Measurements of Specular Objects Using Phase-Measuring Deflectometry

Zonghua Zhang, Yuemin Wang, Shujun Huang, Yue Liu, Caixia Chang, Feng Gao, Xiangqian Jiang
2017 Sensors  
Therefore, most of the existing PMD systems contain one or two cameras. A stereo-camera PMD system can simplify the geometric calibration comparing to using mono camera.  ...  Compared with interferometry, deflectometric techniques do not need to locate the specular objects under investigation at a precise position.  ...  Silicon Wafers and Ball Grid Array Some small specular objects, for example, wafers and ball grid arrays (BGAs), require small fields of view for the imaging lens and display screen to measure the 3D shape  ... 
doi:10.3390/s17122835 pmid:29215600 pmcid:PMC5750795 fatcat:o7xrdw43kzetrgeihapxn2xtim

Development of structured light 3D-scanner with high spatial resolution and its applications for additive manufacturing quality assurance

Rongxuan Wang, Andrew C. Law, David Garcia, Shuo Yang, Zhenyu Kong
2021 The International Journal of Advanced Manufacturing Technology  
However, due to limitations with the spatial resolution, scanning speed, and size of the focusing area, commercially available systems cannot be directly used for in-process monitoring in smart manufacturing  ...  For example, a metal 3D printer requires a scanner with second-level sensing, micron-level spatial resolution, and a centimeter-scale scanning region.  ...  For example, Li and Zhang [21] used telecentric lenses with Levenberg-Marquardt optimization to calibrate microscopic 3D scanners to a 10×8×5 mm 3 volume.  ... 
doi:10.1007/s00170-021-07780-2 fatcat:qfkurw5sjjfujk5i2lzwp37l5m

Implementation of an Automatic Measurements System for LED Dies on Wafer [chapter]

Hsien-Huang P., Jing-Guang Yang, Ming-Mao Hsu, Soon-Lin Chen Ping-Kuo Weng, Ying-Yih Wu
2010 Mechatronic Systems Applications  
In this paper, a system integration method was proposed and successfully realized to implement an automatic measurements and grading (AMG) system for the LED dies after the wafer has been scribed and broken  ...  This suggested approach combines machine vision, optical measurement instruments, and mechanical technology to create an affordable, flexible, and highly efficient LED measurement and grading system.  ...  In order to obtain accurate position estimation, MML (Machine Micro Lens) telecentric lenses is used to provide a constant perspective angle across the field.  ... 
doi:10.5772/8924 fatcat:ig56kmgmurflrmvwchh2pmtyca

Underwater microscopy for in situ studies of benthic ecosystems

Andrew D. Mullen, Tali Treibitz, Paul L. D. Roberts, Emily L. A. Kelly, Rael Horwitz, Jennifer E. Smith, Jules S. Jaffe
2016 Nature Communications  
Here we present a system capable of non-invasively imaging seafloor environments and organisms in situ at nearly micrometre resolution.  ...  We overcome the challenges of underwater microscopy through the use of a long working distance microscopic objective, an electrically tunable lens and focused reflectance illumination.  ...  We also thank Darla White for assisting with the data collection in Maui as well as Yoan Eynaud and Stuart Sandin for their guidance regarding the spatial analysis.  ... 
doi:10.1038/ncomms12093 pmid:27403715 pmcid:PMC4945872 fatcat:bqxcz23aavbepbds75eahrxbtm

Compressive Imaging and Characterization of Sparse Light Deflection Maps [article]

Prasad Sudhakar, Laurent Jacques, Xavier Dubois, Philippe Antoine, Luc Joannes
2015 arXiv   pre-print
., an optical system providing linear measurements of deflection spectra with programmable spatial light modulation patterns.  ...  object point location.  ...  telecentric system.  ... 
arXiv:1406.6425v2 fatcat:xcjyuzoyazhzdiair72q5qtdfe

The Gemini Near‐Infrared Imager (NIRI)

Klaus W. Hodapp, Joseph B. Jensen, Everett M. Irwin, Hubert Yamada, Randolph Chung, Kent Fletcher, Louis Robertson, Joseph L. Hora, Douglas A. Simons, Wendy Mays, Robert Nolan, Matthieu Bec (+2 others)
2003 Publications of the Astronomical Society of the Pacific  
It is equipped with an infrared on-instrument wave-front sensor (OIWFS) to allow tip-tilt and focus correction even in highly obscured regions.  ...  The Gemini Observatory is operated by the Association of Universities for Research in Astronomy, Inc., under a cooperative agreement with the NSF on behalf of the Gemini partnership: the National Science  ...  Dave Montgomery assisted us in re-solving the problems with the beam-steerer bearings.  ... 
doi:10.1086/379669 fatcat:xraislfy4fcqdkkyeqlgj4wp6i

InvertNet: a new paradigm for digital access to invertebrate collections

Chris Dietrich, John Hart, David Raila, Umberto Ravaioli, Nahil Sobh, Omar Sobh, Chris Taylor
2012 ZooKeys  
InvertNet aims to develop improved semi-automated, high-throughput workflows for digitizing and providing access to invertebrate collections that balance the need for speed and cost-effectiveness with  ...  National Science Foundation's Advancing Digitization of Biological Collections (ADBC) program, is tasked with providing digital access to ~60 million specimens housed in 22 arthropod (primarily insect)  ...  Acknowledgments We thank the editors for inviting us to contribute to this special volume and Paul Tinerella (U. Minnesota) for initial discussions on digitization procedures.  ... 
doi:10.3897/zookeys.209.3571 pmid:22859886 pmcid:PMC3406474 fatcat:s7m6g5qmlrcjxbvwto4wscqcou
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