Yongchang Wang

       Yongchang Wang
3D Imaging Laboratory
Center for Visualization and Virtual Environments
Electrical and Computer Engineering
University of Kentucky
Email: ychwang6@gmail.com
Curriculum Vitae


Interests Education Research Publications Invention Disclosures News Links

Interests

My research interests include: structured light 3D system, laser 3D system, biometrics (fingerprint), control system, signal/image processing, computer vision, and circuit design. My work indeed is not only research-oriented, but also useful for industry applications.
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Education

Ph.D. (2010) Dept. of Electrical Engineering, University of Kentucky, USA. PhD dissertation: Novel Approaches in Structured Light Illumination.

Master of Science (2008) Dept. of Electrical Engineering, University of Kentucky, USA. Master thesis: Performance analysis of 3-dimensional fingerprint scan system.

Bachelor of Engineering (2005) Dept. of Electrical Engineering, Zhejiang University, China.
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Research

University of Kentucky - USA
Jun.2007-Present Research and development on the current world's fastest structured light 3D system, both hardware and software. The system achieves real-time data acquisition, processing and visualization. The frame rate achieves 120 fps with high resolution of 640*480, using an Intel Core 2 Duo Quad Q9650 processor. This novel system employs structured light, pattern design, gamma distortion correction, noise analysis and reduction, motion compensation, filter design and other techniques (Visual C++). (Also see the real-time 3D system at 3D Imaging Lab)

Jun.2008-Feb.2009 Research and development on a cell scanner, both hardware and software (control system). The scanner employs three motors and a camera to automatically find qualified cells by employing image processing techniques. The qualified cell will be picked up by a needle straw (.Net).

Jan.2008-Mar.2009 Research and development on a high accurate multi-view hybrid 3D scanning system. The system is based on noise model and combines the techniques of structured light and stereo vision. The reconstruction achieves a 26 times reduction in error, compared to traditional structured light system, especially in the albedo/depth high contrast area. The system employs structured light, stereo vision, noise modeling/analysis and other techniques (.Net). (Also see the hybrid 3D system at 3D Imaging Lab)

Jan.2007-Dec.2008 Research and development on the world's first practical depth-detailed 3D contactless/touchless fingerprint live scanner and its post processing algorithm. The current scanner is portable, and takes 0.7 second to scan one 3D fingerprint with 5 million pixels. The 3D fingerprints are detailed into level 3, where even pores on fingers are clear. The 3D fingerprint is further unraveled into 2D to match NIST 2D fingerprint standard. Distortion in traditional 2D fingerprinting is greatly defused. The system employs pattern recognition, de-blurring, data fusion, motion compensation, filter design and other techniques (C++). (Also see the 3D fingerprint scanner at Flashscan3D,LLC)

Aug.2006-Jan.2007 Research and development on a laser tracking scanner.The project employs laser scanning, machine intelligence, face detection/tracking and other techniques (C).

Jan.2006-Jan.2007 Research and development on merging 3D surfaces.

National University of Singapore - Singapore
Aug.2005- Dec.2005 Research and development on Drop on Demand (DOD) System (control system). Six motors are controlled to build designed architectures. Optimized control algorithm is designed. Written in C++.

Zhejiang University - China
Feb.2004-Jun.2005 Research on a new Optimal Fuzzy Control Modeling algorithm. Written in C++.

Sep.2003-Jan.2004 Development on an Internet-Based Inverted Pendulum Control System. Written in JAVA.


Some Details about:

* Real-time 3-D system * Hybrid system/Active Stereo * Non-contact/touchless 3-D fingerprint
* Gamma Model for PMP
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Publications

Conference
[1] Yongchang Wang, Qi Hao, Abhishika Fatehpuria, Daniel L. Lau, and Laurence G. Hassebrook "Data Acquisition and Quality Analysis of 3-Dimensional Fingerprints," IEEE conference on Biometrics, Identity and Security, Tampa, Florida, Sep. 22-24, 2009. [Abstract] [Full Text]

[2] Yongchang Wang, Kai Liu, Qi Hao, Daniel L. Lau, and Laurence G. Hassebrook "Multicamera Phase Measuring Profilometry For Accurate Depth Measurement," Proceedings of SPIE, the International Society for Optical Engineering, Orlando, Florida, Vol. 6555, Apr. 9-15, 2007. [Abstract] [Full Text]

Journal
[1] Yongchang Wang, Laurence G. Hassebrook, and Daniel L. Lau. "Data Acquisition and Processing of 3D Fingerprints," IEEE Transactions on Information Forensics and Security, Vol. 5 No. 4, Dec. 2010.

[2] Yongchang Wang, Kai Liu, Qi Hao, Daniel L. Lau and Laurence G. Hassebrook. "Maximum SNR Pattern Strategy for Phase Shifting Methods in Structured Light Illumination," Journal of the Optical Society of America A, Vol. 27 No. 9, pp. 1962-1971, Sep. 2010. [Full Text]

[3] Yongchang Wang, Qi Hao, Abhishika Fatehpuria, Daniel L. Lau and Laurence G. Hassebrook. "Quality and Matching Performance Analysis of 3D Unraveled Fingerprints," Optical Engineering, Vol. 49 Issue 7, pp. 077202 (1-10), Jul. 2010. [Full Text]

[4] Kai Liu, Yongchang Wang, Daniel L. Lau, Qi Hao and Laurence G. Hassebrook. "Dual-frequency pattern scheme for high-speed 3-D shape measurement," Optics Express, Vol. 18, pp. 5229-5244, Mar. 2010. [Free Full Text][Images of the week Mach 1, 2010 on OpticsInfoBase]

[5] Kai Liu, Yongchang Wang, Daniel L. Lau, Qi Hao and Laurence G. Hassebrook. "Gamma Model and its Analysis for Phase Measuring Profilometry," Journal of the Optical Society of America A, Vol. 27, pp. 553-562, Mar. 2010. [Full Text]

[6] Yongchang Wang, Daniel L. Lau and Laurence G. Hassebrook. "Fit-sphere unwrapping and performance analysis of 3D Fingerprints," Applied Optics, Vol. 49, Issue 4, pp. 592-600, Feb. 2010. [Abstract] [Full Text]

[7] Yongchang Wang, Kai Liu, Qi Hao, Daniel L. Lau and Laurence G. Hassebrook. "Hybrid Structured Light Illumination and Stereo Vision 3-D Reconstruction," Submitted to IEEE Transactions on Pattern Analysis and Machine Intelligence, 2009.

[8] Yongchang Wang, Kai Liu, Qi Hao, Daniel L. Lau and Laurence G. Hassebrook. "Period Coded Phase Shifting Strategy for 3-D Real-time Acquisition and Data Processing," Submitted to IEEE Transactions on Image Processing, 2009.

[9] Yongchang Wang, Wang Hao, Chen Liang, Zhu Shanan "Java-based inverted-pendulum Control System," Control of China, 4, 04429, 2005.

Others
[1] Kai Liu, Yongchang Wang, Daniel Lau, Laurence Hassebrook and Qi Hao, "Towards gesture-controlled computers with real-time structured light," SPIE Newsroom. DOI: 10.1117/2.1201005.002941, May. 2010. [Free Full Text]

[2] Yongchang Wang, Laurence G. Hassebrook, and Daniel L. Lau. "Noncontact, depth-detailed 3D fingerprinting," SPIE Newsroom. DOI: 10.1117/2.1200912.002552, Dec. 2009. [Free Full Text]
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Invention Disclosures

[1] Yongchang Wang, Daniel L. Lau, Laurence G. Hassebrook and Kai Liu. Patent on Multi-camera Phase Measuring Profilometry for Accurate Registration and Geometric Fitting 3D surface Unraveling Algorithm. Sep 20, 2009. INV09/1667. Approved for provisional patent application by University of Kentucky.

[2] Kai Liu, Yongchang Wang, Daniel L. Lau, and Laurence G. Hassebrook. Parallel Frequency-Division Multiplexing (PFDM) and Period Coded Phase Measuring(PCPM) pattern strategies in 3-D structured light systems, and Lookup Table (LUT) based real-time data processing for 3-D reconstruction. Oct 9, 2009. INV09/1686. Approved for provisional patent application by University of Kentucky.

[3] Laurence G. Hassebrook, C. J. Casey, E. Crane, W. Lundby, Yongchang Wang, and Kai Liu, "Roate and Hold and Scan Structured Light Illumination Pattern Encoding and Decoding," INV09/1706. Approved for provisional patent application by University of Kentucky.

[4] Yongchang Wang, Kai Liu, Daniel L. Lau, and Laurence G. Hassebrook. "A Maximum SNR Pattern Strategy for Phase Shifting Methods in Structured Light Illumination and Gamma model and its analysis for Phase Measuring Profilometry," INV09/1710. Approved for provisional patent application by University of Kentucky.
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News about My Research

MEMS startup aims picoprojectors at 3-D modeling, EE Times -- Jul 2010

"Steal" your fingerprint in less than one second (Chinese), China Youth Online -- Oct 2009

Touchless, 3-D fingerprinting system promises speed, accuracy, Smart Planet -- Oct 2009

3D Finger and Palm Print Scanner is Demonstrated at the Biometrics Consortium Conference, The National Institute for Hometown Security -- Oct 2009

3-D Scanning Brings the Future of Fingerprinting, Popular Science -- Sep 2009

Touchless 3-D Fingerprinting, Technology Review -- Sep 2009

Realtime 3D system, Prosilica Camera News -- Sep 2009 (published in the November issue of Inspect Magazine in both German and English)

Machine Vision Technology Leaves Its Print on Surveillance, Photonics Spectra -- May 2008

Vision Systems Tackle Fingerprint Analysis, Vision Systems Design -- Dec 2007

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Links

Organizations and Companies


People

Daniel L. Lau Laurence G. Hassebrook Kai Liu Qi Hao
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