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Journal articles on the topic 'Telecentric'

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Published: 4 June 2021
Last updated: 9 February 2022

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1

Nikolov, I. D. "Orthoscopic Telecentric Lenses." Optica Acta: International Journal of Optics 32, no. 1 (1985): 107–19. http://dx.doi.org/10.1080/713821648.

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2

Yao, Linshen, and Haibo Liu. "Design and Analysis of High-Accuracy Telecentric Surface Reconstruction System Based on Line Laser." Applied Sciences 11, no. 2 (2021): 488. http://dx.doi.org/10.3390/app11020488.

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Non-contact measurement technology based on triangulation with cameras is extensively applied to the development of computer vision. However, the accuracy of the technology is generally not satisfactory enough. The application of telecentric lenses can significantly improve the accuracy, but the view of telecentric lenses is limited due to their structure. To address these challenges, a telecentric surface reconstruction system is designed for surface detection, which consists of a single camera with a telecentric lens, line laser generator and one-dimensional displacement platform. The designed system can reconstruct the surface with high accuracy. The measured region is expanded with the used of the displacement platform. To achieve high-accuracy surface reconstruction, we propose a method based on a checkerboard to calibrate the designed system, including line laser plane and motor direction of the displacement platform. Based on the calibrated system, the object under the line laser is measured, and the results of lines are assembled to make the final surface reconstruction. The results show that the designed system can reconstruct a region of 20×40 mm2, up to the accuracy of micron order.
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3

Watanabe, M., and S. K. Nayar. "Telecentric optics for focus analysis." IEEE Transactions on Pattern Analysis and Machine Intelligence 19, no. 12 (1997): 1360–65. http://dx.doi.org/10.1109/34.643894.

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4

HATTORI, Susumu, Harutaka IMOTO, and Shigekazu KATAGIRI. "ORIENTATION OF TELECENTRIC LENS CAMERA IMAGES." Journal of Japan Society of Civil Engineers, Ser. F3 (Civil Engineering Informatics) 69, no. 1 (2013): 58–65. http://dx.doi.org/10.2208/jscejcei.69.58.

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5

DU Li-hui, 杜立辉, 王立强 WANG Li-qiang, 杨天领 YANG Tian-ling, 陆祖康 LU Zu-kang, and 段会龙 DUAN Hui-long. "Miniature Telecentric Confocal Laser Scanning Endomicroscopy." ACTA PHOTONICA SINICA 40, no. 12 (2011): 1767–70. http://dx.doi.org/10.3788/gzxb20114012.1767.

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6

Kim, Jun-Sik, and Takeo Kanade. "Multiaperture telecentric lens for 3D reconstruction." Optics Letters 36, no. 7 (2011): 1050. http://dx.doi.org/10.1364/ol.36.001050.

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7

Gips, Peter, Gregor Federau, and Ulrich Oechsner. "Telecentric Imaging with Line Scan Cameras." Optik & Photonik 12, no. 3 (2017): 49–52. http://dx.doi.org/10.1002/opph.201700020.

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8

Djidel, Slimane, Justyna K. Gansel, Heather I. Campbell, and Alan H. Greenaway. "High-speed, 3-dimensional, telecentric imaging." Optics Express 14, no. 18 (2006): 8269. http://dx.doi.org/10.1364/oe.14.008269.

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9

Chen, Chao, Bin Chen, and Bing Pan. "Telecentric camera calibration with virtual patterns." Measurement Science and Technology 32, no. 12 (2021): 125004. http://dx.doi.org/10.1088/1361-6501/ac1bec.

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10

Wu, Qiong, Yang Xiang, Bin Yang, Qian Song, Li Jie Hou, and Qian Qian Wu. "Optical Design of Endoscopic Telecentric Measuring Apparatus." Key Engineering Materials 552 (May 2013): 325–28. http://dx.doi.org/10.4028/www.scientific.net/kem.552.325.

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Endoscopic telecentric apparatus is a precision measuring instrument which consists of optical, mechanical and electrical technologies. It can be applied in real-time accurate test to detect the position, shape and wall surface defects of brake master cylinder. This paper designed an optical system with Zemax, it can be used in endoscopic telecentric apparatus. The system has 4mm linear field of view, the line of vision is 90°,the magnification is 0.75×,the depth of field is 6mm.The value of modulation transfer function (MTF) is close to the diffraction limit, the resolution of the system is up to 3 and the spot diagrams of all configurations are smaller than Airy disk, the total track is less than 300mm. It adopts 1/6CCD to receive image, the measurement accuracy reaches to 0.03mm.The system uses pentagonal prism to realize 90°line of vision, it is convenient to assemble and avoids the mirror image. The image quality is good and the design meets the requirement.
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11

DOBLAS, A., E. ROCHE, F. J. AMPUDIA-BLASCO, M. MARTÍNEZ-CORRAL, G. SAAVEDRA, and J. GARCIA-SUCERQUIA. "Diabetes screening by telecentric digital holographic microscopy." Journal of Microscopy 261, no. 3 (2015): 285–90. http://dx.doi.org/10.1111/jmi.12331.

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12

Fournel, T., S. Coudert, C. Fournier, and C. Ducottet. "Stereoscopic particle image velocimetry using telecentric lenses." Measurement Science and Technology 14, no. 4 (2003): 494–99. http://dx.doi.org/10.1088/0957-0233/14/4/313.

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13

Andreev, L. N., V. V. Ezhova, A. V. Bakholdin, and V. N. Vasil’ev. "Synthesis of telecentric-ray-path pinhole objectives." Journal of Optical Technology 85, no. 12 (2018): 765. http://dx.doi.org/10.1364/jot.85.000765.

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14

Kitzhofer, J., and C. Brücker. "Tomographic particle tracking velocimetry using telecentric imaging." Experiments in Fluids 49, no. 6 (2010): 1307–24. http://dx.doi.org/10.1007/s00348-010-0879-z.

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15

Fisac-García, Ramón, Ana Moreno-Romero, Manuel Acevedo-Ruiz, and Jesús Juan-Ruiz. "Identificación de los elementos organizativos clave en el desempeño de las empresas sociales. El caso de los telecentros en Latinoamérica." Dirección y Organización, no. 56 (July 1, 2015): 43–56. http://dx.doi.org/10.37610/dyo.v0i56.473.

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Las tecnologías han transformado radicalmente el acceso a muchos servicios en la actualidad (educación, cultura, empleo, etcétera). Los telecentros son empresas sociales que tienen por objetivo proveer acceso a las tecnologías y a la información para un alto porcentaje de la población mundial. En este trabajo, de carácter exploratorio, se estudian los principales aspectos organizativos de estas entidades y se determinan los factores clave en su desempeño. A través de una encuesta se evaluó la precepción de los gestores de 49 telecentros en Latinoamérica sobre los principales aspectos organizativos de sus centros así como de su desempeño.Palabras clave: empresa social, desempeño, telecentros, elementos clave.Identifying key organizational elements in the performance of social enterprises. The case of telecentres in Latin AmericaAbstract: Social enterprise is an organizational model based on the sale of products and services to achieve a social mission. Social enterprises are characterized by two elements: first, it pursues a social mission, defined by a societal problem or an environmental challenge. Second, it is uses a market-based approach consisting on the sale of goods and/or services. It represents an interesting alternative for projects aiming to provide access to basic goods and services as it relies on a self-generated income formula and a flexible model which supports economic and social sustainability. The goal of this article is to analyze the main organizational elements of a sample of telecentres and to explore whether a relationship can be identified between some of the elements and the organization performance. A better knowledge in these issues can help existing organizations improve its sustainability and the design of social enterprises. This article draws on a previous organizational model for the analysis of social enterprises developed at the Universidad Politecnica de Madrid. The model consists of 8 elements divided into 3 different categories: those referring to the goals of the initiative (what is to be done), those describing the people working on the initiative (stakeholders) and those related to the operational elements. The empirical study has been carried out within Telecentre.org, an international foundation that supports the establishment and sustainability of grassroots level telecentres. These entities provide access to communication and information services for economic, social and cultural development in local communities. The study consist of a 36-item questionnaire designed and developed by the authors to capture the perceptions of telecentre managers on the most relevant organizational aspects of their organizations, and on four dimensions of the telecentre performance: social, economic, customer satisfaction and employees and volunteer satisfaction. A factor analysis transformation is done to summarize the information contained in the 36 items of the questionnaire. Then, correlation studies and regressions were carried out to identify the relations among the different variables. The results show that the global performance is highly correlated with seven of the elements of the organizational analysis model used. Organizational culture emerges as an element that explains a big part of the global performance, the customer satisfaction and the employees/volunteer satisfaction.Key words: social enterprise, performance, telecentre, key factors.
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16

Chen, Kepeng, Tielin Shi, Qiang Liu, Zirong Tang, and Guanglan Liao. "Microscopic Three-Dimensional Measurement Based on Telecentric Stereo and Speckle Projection Methods." Sensors 18, no. 11 (2018): 3882. http://dx.doi.org/10.3390/s18113882.

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Three-dimensional (3D) measurement of microstructures has become increasingly important, and many microscopic measurement methods have been developed. 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. Here we present a method combining the microscopic stereo measurement with the digital speckle projection. A microscopy experimental setup mainly composed of two telecentric cameras and an industrial projection module is established and a telecentric binocular stereo reconstruction procedure is carried out. The measurement accuracy has firstly been verified by performing 3D measurements of grid arrays at different locations and cylinder arrays with different height differences. Then two Mitutoyo step masters have been used for further verification. The experimental results show that the proposed method can obtain 3D information of the microstructure with a sub-pixel and even sub-micron measuring accuracy in millimeter scale.
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17

Zhimuleva, E. S., P. S. Zavyalov, and M. S. Kravchenko. "Development of Telecentric Objectives for Dimensional Inspection Systems." Optoelectronics, Instrumentation and Data Processing 54, no. 1 (2018): 52–60. http://dx.doi.org/10.3103/s8756699018010090.

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18

Mikš, Antonín, and Jiří Novák. "Design of a double-sided telecentric zoom lens." Applied Optics 51, no. 24 (2012): 5928. http://dx.doi.org/10.1364/ao.51.005928.

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19

Stickel, W., G. O. Langner, and P. F. Petric. "Telecentric beam positioning for advanced e-beam lithography." Microelectronic Engineering 17, no. 1-4 (1992): 25–28. http://dx.doi.org/10.1016/0167-9317(92)90008-f.

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20

Kapondera, Sellina Khumbo, and Wallace Chigona. "Domestication of Telecentres by Malawian Rural Women." International Journal of Information Communication Technologies and Human Development 10, no. 1 (2018): 51–64. http://dx.doi.org/10.4018/ijicthd.2018010104.

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The potential of telecentres to bridge the digital divide can only be realised when their services are appropriated by all groups in the community. Previous studies show that in Malawi only a few women use telecentres. This article used Domestication Theory to explain the processes through which women in rural Malawi encounter technologies, deal with them and integrate them into their lives. Data was obtained via interviews with women (both users and non-users) and a Telecentre Manager. The study shows that: i) commodification was influenced mainly by word of mouth; ii) the women who appropriated the Telecentre used it for instrumental and hedonic purposes; iii) the appropriation was influenced by convenience, compatibility with the needs of women and perceived usefulness of the Telecentre; and iv) non-use was due to lack of awareness, illiteracy, limited financial resources, cultural roles and perceptions about the telecentres. The findings could help policymakers in maximising use of telecentres among women.
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21

Kulchitskiy, Aleksandr. "Optical Inspection Systems for Axisymmetric Parts with Spatial 2D Resolution." Symmetry 13, no. 7 (2021): 1218. http://dx.doi.org/10.3390/sym13071218.

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The article proposes a solution to the problem of increasing the accuracy of determining the main shaping dimensions of axisymmetric parts through a control system that implements the optical method of spatial resolution. The influence of the projection error of a passive optical system for controlling the geometric parameters of bodies of revolution from the image of its sections, obtained by a digital camera with non-telecentric optics, on the measurement accuracy is shown. Analytical dependencies are derived that describe the features of the transmission of measuring information of a system with non-telecentric optics in order to estimate the projection error. On the basis of the obtained dependences, a method for compensating the projection error of the systems for controlling the geometry of the main shaping surfaces of bodies of revolution has been developed, which makes it possible to increase the accuracy of determining dimensions when using digital cameras with a resolution of 5 megapixels or more, equipped with short-focus lenses. The possibility of implementing the proposed technique is confirmed by the results of experimental studies.
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22

Li Mingdong, 李明东, 高兴宇 Gao Xingyu, 叶鹏 Ye Peng, and 陈朋波 Chen Pengbo. "Design of Aspherical Double Telecentric Lens for Machine Vision." Laser & Optoelectronics Progress 53, no. 7 (2016): 070801. http://dx.doi.org/10.3788/lop53.070801.

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23

Schmitt, Robert, Tilo Pfeifer, and Guilherme Mallmann. "Machine integrated telecentric surface metrology in laser structuring systems." ACTA IMEKO 2, no. 2 (2014): 73. http://dx.doi.org/10.21014/acta_imeko.v2i2.106.

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The laser structuring is an innovative technology used in a broad spectrum of industrial branches. There is, however, a market trend to smaller and more accurate micro structures, which demands a higher level of precision and efficiency in this process. In this terms, an inline inspection is necessary, in order to improve the process through a closed-loop control and early defect detection. Within this paper an optical measurement system for inline inspection of micro and macro surface structures is described. Measurements on standards and laser structured surfaces are presented, which underline the potential of this technique for inline surface inspection of laser structured surfaces.
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24

Chen, Zhong, Huiyang Liao, and Xianmin Zhang. "Telecentric stereo micro-vision system: Calibration method and experiments." Optics and Lasers in Engineering 57 (June 2014): 82–92. http://dx.doi.org/10.1016/j.optlaseng.2014.01.021.

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25

Chen, Kepeng, Tielin Shi, Xiao Wang, et al. "Calibration of telecentric cameras with an improved projection model." Optical Engineering 57, no. 04 (2018): 1. http://dx.doi.org/10.1117/1.oe.57.4.044103.

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26

Rao, Li, Feipeng Da, Weiqi Kong, and Heming Huang. "Flexible calibration method for telecentric fringe projection profilometry systems." Optics Express 24, no. 2 (2016): 1222. http://dx.doi.org/10.1364/oe.24.001222.

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27

Sun, Wen-shing, and Jui-Wen Pan. "Non-telecentric projection lens design for an LED projector." Applied Optics 56, no. 3 (2017): 712. http://dx.doi.org/10.1364/ao.56.000712.

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28

Berger, Christian. "Design of telecentric imaging systems for noncontact velocity sensors." Optical Engineering 41, no. 10 (2002): 2599. http://dx.doi.org/10.1117/1.1504105.

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29

Pacheco, Shaun, and Rongguang Liang. "Snapshot, reconfigurable multispectral and multi-polarization telecentric imaging system." Optics Express 22, no. 13 (2014): 16377. http://dx.doi.org/10.1364/oe.22.016377.

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30

Dong Jiangchen, 董江琛, and 金振宇 Jin Zhenyu. "Effect of Ring Pupil on Telecentric Fabry-Perot Filter." Laser & Optoelectronics Progress 53, no. 9 (2016): 091103. http://dx.doi.org/10.3788/lop53.091103.

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31

Schulz, Jonas, Kevin Schäfer, and Hans‐Jörg Bart. "Entrainment Control Using a Newly Developed Telecentric Inline Probe." Chemie Ingenieur Technik 92, no. 3 (2019): 256–65. http://dx.doi.org/10.1002/cite.201900112.

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32

Zhong, Yi, Ziyao Tang, and Herbert Gross. "Correction of 2D-telecentric scan systems with freeform surfaces." Optics Express 28, no. 3 (2020): 3041. http://dx.doi.org/10.1364/oe.381290.

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33

Li, Dong, Chunyang Liu, and Jindong Tian. "Telecentric 3D profilometry based on phase-shifting fringe projection." Optics Express 22, no. 26 (2014): 31826. http://dx.doi.org/10.1364/oe.22.031826.

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34

Link, Claudia. "Telecentric Blue Light Lenses: Promising Advantages for Machine Vision." Information Display 37, no. 1 (2021): 23–28. http://dx.doi.org/10.1002/msid.1179.

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35

YONEHARA, Noriyoshi, Yasufumi YAMAMOTO, and Tomomasa UEMURA. "Velocity Measurement by Stereoscopic Micro-PTV Technique Using Telecentric Lenses." Journal of the Visualization Society of Japan 23, Supplement1 (2003): 295–96. http://dx.doi.org/10.3154/jvs.23.supplement1_295.

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36

Li, Dong, and Jindong Tian. "An accurate calibration method for a camera with telecentric lenses." Optics and Lasers in Engineering 51, no. 5 (2013): 538–41. http://dx.doi.org/10.1016/j.optlaseng.2012.12.008.

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37

Liu, Haibo, Zhaokun Zhu, Linshen Yao, et al. "Epipolar rectification method for a stereovision system with telecentric cameras." Optics and Lasers in Engineering 83 (August 2016): 99–105. http://dx.doi.org/10.1016/j.optlaseng.2016.03.008.

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38

Gonzalez-Barbosa, José-Joel, José-Guadalupe Rico-Espino, Roberto-Augusto Gómez-Loenzo, Hugo Jiménez-Hernández, Miguel Razo, and Ricardo Gonzalez-Barbosa. "Accurate 3D Reconstruction using a Turntable-based and Telecentric Vision." Automatika 56, no. 4 (2015): 508–21. http://dx.doi.org/10.1080/00051144.2015.11828664.

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39

Li, Wenjie, Jianmei Wu, Dong Li, Yong Tian, and Jindong Tian. "Telecentricity based measurement error compensation in the bilateral telecentric system." Measurement 147 (December 2019): 106822. http://dx.doi.org/10.1016/j.measurement.2019.07.050.

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40

Chen, Zhong, Dewen Zhou, Huiyang Liao, and Xianmin Zhang. "Precision Alignment of Optical Fibers Based on Telecentric Stereo Microvision." IEEE/ASME Transactions on Mechatronics 21, no. 4 (2016): 1924–34. http://dx.doi.org/10.1109/tmech.2016.2536784.

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41

Ohno, Hiroshi, and Hiroya Kano. "Depth reconstruction with coaxial multi-wavelength aperture telecentric optical system." Optics Express 26, no. 20 (2018): 25880. http://dx.doi.org/10.1364/oe.26.025880.

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42

Hu, Zhilin, and Andrew M. Rollins. "Quasi-telecentric optical design of a microscope-compatible OCT scanner." Optics Express 13, no. 17 (2005): 6407. http://dx.doi.org/10.1364/opex.13.006407.

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43

Zhou Lu, 周路, 迟耀丹 Chi Yaodan, and 郭亮 Guo Liang. "Optical System Design of Object-Telecentric Dual Finger Fingerprint Scanner." Laser & Optoelectronics Progress 53, no. 10 (2016): 102201. http://dx.doi.org/10.3788/lop53.102201.

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44

Greisukh, Grigoriy I., Evgeniy G. Ezhov, Il’ya A. Levin, and Sergei A. Stepanov. "Design of the double-telecentric high-aperture diffractive–refractive objectives." Applied Optics 50, no. 19 (2011): 3254. http://dx.doi.org/10.1364/ao.50.003254.

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45

Kurihara, Kenji. "Two-mirror telecentric optics for soft x-ray reduction lithography." Journal of Vacuum Science & Technology B: Microelectronics and Nanometer Structures 9, no. 6 (1991): 3189. http://dx.doi.org/10.1116/1.585314.

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46

Wu, Huan-Bao, Zhao-Qi Wang, Ru-Lian Fu та Juan Liu. "Design of a hybrid diffractive/refractive achromatized telecentric f·θ lens". Optik 117, № 6 (2006): 271–76. http://dx.doi.org/10.1016/j.ijleo.2005.09.010.

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47

Hu, Yan, Zhongwei Liang, Shijie Feng, et al. "Calibration and rectification of bi-telecentric lenses in Scheimpflug condition." Optics and Lasers in Engineering 149 (February 2022): 106793. http://dx.doi.org/10.1016/j.optlaseng.2021.106793.

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48

Liu, Wen Wen, Zhi Wang, Yun Hai Du, Xian Zhong Xu, Da Quan Liu, and Li Shi. "Study on Mechanical Properties of the Composite Materials Film by Speckle Projection Method." Advanced Materials Research 496 (March 2012): 281–84. http://dx.doi.org/10.4028/www.scientific.net/amr.496.281.

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An improved accurate speckle projection method is used for study the mechanical properties of the composite material film in the paper. A system for deformation measurement is developed with the telecentric lenses, in which such conventional lens’ disadvantages such as lens distortion and perspective error will be diminished. Experiments are performed to validate the availability and reliability of the calibration method. The system can also be used to measure the dynamic deformation and then results are also given.
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49

Lwoga, Edda Tandi, and Wallace Chigona. "Perception, usage and barriers towards the utilisation of the Telecentre among rural women in Tanzania." Journal of Information, Communication and Ethics in Society 17, no. 1 (2019): 2–16. http://dx.doi.org/10.1108/jices-01-2018-0004.

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Purpose This paper aims to assess the usage pattern of telecentres, how rural women frame telecentres and barriers that limit use of telecentres. Further, the study examined the effects of demographic characteristics and location on telecentre usage. Design/methodology/approach The study used a sequential mixed research design in three rural districts surrounding telecentres: Kongwa, Sengerema and Kilosa districts. The study population comprised rural women who were users and non-users of telecentres. The study conducted six focus group discussions (FGDs) with 37 users and six FGDs with 36 non-users in the first phase of the study in 2014; questionnaires were administered to 90 users and 90 non-users in the second phase of the study in 2015. Findings The primary use of telecentres among users was to access internet (71.4 per cent, n = 60), followed by information and communication technology (ICT) training courses (63.1 per cent, n = 53) and secretarial purposes (63.1 per cent, n = 53). Rural women used internet for educational purposes, followed by news, information on health issues, job opportunities, social and entertainment issues. Rural women currently using internet were more likely to be better educated (ß = 1.926, p = 0.001) and have higher incomes (ß = 5.318, p = 0.021) at both bivariate and multivariate analysis. Users indicated that they faced the following barriers towards using telecentre: short duration of ICT training, frequent power outages, low speed of internet and few computers at the telecentres. Non-users were not using telecentres because of lack of ICT skills and language barriers. Originality/value This study provides empirical evidence to telecentres, libraries and other rural ICT initiatives to design rural ICT services that are gender-sensitive and demand-driven.
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50

Wu, Zhe Ming, Xiao Pin Yang, Hong Bo Xie, et al. "A Low-Distortion Single Fingerprint Acquisition Optical System." Advanced Materials Research 605-607 (December 2012): 2023–26. http://dx.doi.org/10.4028/www.scientific.net/amr.605-607.2023.

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In this paper, a method of correction for the trapezoid distortion of the single fingerprint acquisition system is proposed, which combines nearly telecentric optical path and the inclined plane compensation. According to the method presented, an actual fingerprint acquisition system is designed. There is a prism and two lenses in the system. The resolution of fingerprint acquisition can reach 500dpi. Its optical length is in 45mm, the maximum grid distortion is 0.43%. These meet the standard of the FBI fingerprint scanning system.
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