Dr. Zili Zhang Profile

Dr. Zili Zhang

Associate Researcher at Academy of Opto-Electronics CAS

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Author

Publications (15)

Proceedings Article | 18 March 2024 Paper

Image processing method in bump height measurement in chip packaging

Xinxin Zhang, Zili Zhang, Xiaoyan Shen, Fanchang Meng, Dezhao Wang

Proceedings Volume 13104, 1310454 (2024) https://doi.org/10.1117/12.3023654

KEYWORDS: Image processing, Feature extraction, Laser processing, Packaging, Computer simulations, Matrices, Inspection, Semiconducting wafers, Reflection, Objectives

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Proceedings Article | 24 November 2023 Paper

Flexible continuous phase shifts method for binary defocusing technique with short pitch fringes

Dezhao Wang, Weihu Zhou, Zili Zhang, Fanchang Meng, Na Wang

Proceedings Volume 12935, 1293536 (2023) https://doi.org/10.1117/12.3007735

KEYWORDS: Phase shifts, Fringe analysis, Structured light, 3D surface sensing

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Proceedings Article | 5 November 2020 Paper

An improved method of corner point extraction used in grating projection phase measurement

Chengtao Ma, Fanchang Meng, Yangkuan Guo, Yajie Li, Zili Zhang

Proceedings Volume 11567, 1156738 (2020) https://doi.org/10.1117/12.2580132

KEYWORDS: Calibration, Detection and tracking algorithms, Cameras, Feature extraction, 3D metrology, Projection systems, Phase measurement, Corner detection, Reconstruction algorithms

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Proceedings Article | 18 December 2019 Paper

An improved method of light stripe extraction

Xiangyu Ma, Zili Zhang, Can Hao, Fanchang Meng, Weihu Zhou, Lianqing Zhu

Proceedings Volume 11338, 113383O (2019) https://doi.org/10.1117/12.2548150

KEYWORDS: Speckle, Image filtering, Hough transforms, Image enhancement, Structured light, Edge detection, Image quality, Feature extraction

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Proceedings Article | 18 December 2019 Paper

Real-time dynamic measurement of geometric parameters of catenary

Fanchang Meng, Zili Zhang, Can Hao, Jia Deng, Weihu Zhou

Proceedings Volume 11338, 113383D (2019) https://doi.org/10.1117/12.2548060

KEYWORDS: Calibration, Image processing, Cameras, Structured light, Laser processing, Computer programming, Image acquisition, Signal processing, Process control, Prototyping

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Proceedings Article | 7 March 2019 Paper

Phase measuring method and error compensation in 3D profile measurement

Yan Zhang, Zili Zhang, Yueqiang Li, Weihu Zhou, Yang He, Wei Li

Proceedings Volume 11053, 110532X (2019) https://doi.org/10.1117/12.2512073

KEYWORDS: Heterodyning, 3D metrology, Phase shifts, Raster graphics, CCD cameras, Error analysis, Cameras, Projection systems, Fringe analysis, Distortion

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Proceedings Article | 12 January 2018 Paper

Characterization of the terahertz frequency optical constants of tourmaline

Weichong Tang, Zili Zhang, Ke Xiao, Changchun Zhao, Zhiyuan Zheng

Proceedings Volume 10623, 106230S (2018) https://doi.org/10.1117/12.2302440

KEYWORDS: Absorption, Terahertz radiation, Crystals, Refraction, Refractive index, Terahertz spectroscopy, Spectroscopy, Polarization, Minerals, Optical properties

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Proceedings Article | 24 November 2016 Paper

An automatic large-scale 3D coordinate measurement system based on vision guidance

Zili Zhang, Guanghua Wu, Qiyue Wang, Yan Zhang, Weihu Zhou

Proceedings Volume 10023, 100230I (2016) https://doi.org/10.1117/12.2246546

KEYWORDS: Cameras, 3D metrology, Calibration, 3D vision, 3D acquisition, Telescopes, Distance measurement, Imaging systems, Information visualization, Interferometers

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Proceedings Article | 31 October 2016 Paper

Cross-center extraction with sub-pixel accuracy

Guanghua Wu, Zili Zhang, Weihu Zhou

Proceedings Volume 10020, 1002019 (2016) https://doi.org/10.1117/12.2246312

KEYWORDS: Hough transforms, Algorithm development, Detection and tracking algorithms, Laser scanners, Laser systems engineering, Edge detection, Convolution, Gaussian filters, Optoelectronics, Charge-coupled devices

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Proceedings Article | 26 January 2016 Paper

Development of femtosecond optical frequency comb laser tracker

Ju-qing Yang, Wei-hu Zhou, Deng-feng Dong, Zi-li Zhang, Da-bao Lao, Rong-yi Ji, Da-yong Wang

Proceedings Volume 9903, 990307 (2016) https://doi.org/10.1117/12.2218144

KEYWORDS: Femtosecond phenomena, Distance measurement, Frequency combs, Error analysis, Laser optics, Mirrors, Data processing, Calibration, Optical tracking, Femtosecond frequency combs

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Proceedings Article | 7 August 2015 Paper

Geometric error detection and calibration in laser trackers

Zili Zhang, Dabao Lao, Dengfeng Dong, Weihu Zhou

Proceedings Volume 9623, 96230G (2015) https://doi.org/10.1117/12.2193366

KEYWORDS: Calibration, Mirrors, Autocollimators, Optical simulations, CCD cameras, Error analysis, Head, Aluminum, Optoelectronics, Detector development

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Proceedings Article | 6 March 2015 Paper

A novel method for measuring transit tilt error in laser trackers

Zili Zhang, Weihu Zhou, Han Zhu, Xinlong Lin

Proceedings Volume 9446, 94464V (2015) https://doi.org/10.1117/12.2182383

KEYWORDS: Optical simulations, Calibration, Mirrors, Error analysis, Beam analyzers, Head, Computer simulations, Optical tracking, Geometrical optics, Manufacturing

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Proceedings Article | 31 January 2013 Paper

Research and development of the laser tracker measurement system

Z. Zhang, W. Zhou, D. Lao, J. Yuan, D. F. Dong, R. Y. Ji

Proceedings Volume 8759, 87593Z (2013) https://doi.org/10.1117/12.2015200

KEYWORDS: Distance measurement, Measurement devices, Laser systems engineering, Control systems, Laser development, Servomechanisms, Error analysis, Computer programming, Calibration, Head

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Proceedings Article | 3 February 2009 Paper

The guidance methodology of a new automatic guided laser theodolite system

Zili Zhang, Jigui Zhu, Hu Zhou, Shenghua Ye

Proceedings Volume 7160, 71600R (2009) https://doi.org/10.1117/12.806991

KEYWORDS: Control systems, Cameras, Imaging systems, Image processing, Laser systems engineering, Automatic tracking, Calibration, Telescopes, Computing systems, Manufacturing

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Spatial coordinate measurement systems such as theodolites, laser trackers and total stations have wide application in manufacturing and certification processes. The traditional operation of theodolites is manual and time-consuming which does not meet the need of online industrial measurement, also laser trackers and total stations need reflective targets which can not realize noncontact and automatic measurement. A new automatic guided laser theodolite system is presented to achieve automatic and noncontact measurement with high precision and efficiency which is comprised of two sub-systems: the basic measurement system and the control and guidance system. The former system is formed by two laser motorized theodolites to accomplish the fundamental measurement tasks while the latter one consists of a camera and vision system unit mounted on a mechanical displacement unit to provide azimuth information of the measured points. The mechanical displacement unit can rotate horizontally and vertically to direct the camera to the desired orientation so that the camera can scan every measured point in the measuring field, then the azimuth of the corresponding point is calculated for the laser motorized theodolites to move accordingly to aim at it. In this paper the whole system composition and measuring principle are analyzed, and then the emphasis is laid on the guidance methodology for the laser points from the theodolites to move towards the measured points. The guidance process is implemented based on the coordinate transformation between the basic measurement system and the control and guidance system. With the view field angle of the vision system unit and the world coordinate of the control and guidance system through coordinate transformation, the azimuth information of the measurement area that the camera points at can be attained. The momentary horizontal and vertical changes of the mechanical displacement movement are also considered and calculated to provide real time azimuth information of the pointed measurement area by which the motorized theodolite will move accordingly. This methodology realizes the predetermined location of the laser points which is within the camera-pointed scope so that it accelerates the measuring process and implements the approximate guidance instead of manual operations. The simulation results show that the proposed method of automatic guidance is effective and feasible which provides good tracking performance of the predetermined location of laser points.

Proceedings Article | 3 February 2009 Paper

Resolution improvement of the electronic theodolite in automatic guided laser theodolite system by subdivided locating method of image

Hu Zhou, Jigui Zhu, Zili Zhang, Shenghua Ye

Proceedings Volume 7160, 71602O (2009) https://doi.org/10.1117/12.807057

KEYWORDS: Laser systems engineering, Image processing, Image segmentation, Image resolution, Cameras, Imaging systems, Oxygen, Data modeling, Commercial off the shelf technology, CCD cameras

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Showing 5 of 15 publications

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