Structured Light Illumination

Structured light is a method of 3D imaging based on active triangulation between a projector and camera where the projector projects a series of striped line patterns, from which the warping of the pattern around a target object allows the camera to reconstruct the 3D surface. My research group is focused primarily on minimizing artifacts in scans caused by sensor noise, object motion, and pattern distortion in the projector/camera. The photos and videos below highlight some of the projects we’ve been working on including scanners.

Invited Articles/Presentations
  1. D. L. Lau, "Integration Insights - 3-D Imaging for Machine Vision," Vision Systems Design: Webcasts, December 8, 2009 Details.html?id=1003.
  2. Y. Wang, D. L. Lau, and L. G. Hassebrook, "Non-contact, depth-detailed 3-D fingerprinting," SPIE Newsroom, DOI: 10.1117/2.1200912.002552, December 31, 2009
  3. K. Liu, Y. Wang, D. L. Lau, L. G. Hassebrook, and Q. Hao , "Towards gesture-controlled computers with real-time structured light," SPIE Newsroom, 10.1117/2.1201005.002941, May 11, 2010
  4. D. L. Lau, "Integration Insights - Advanced 3-D Imaging for Machine Vision," Vision Systems Design: Webcasts, May 23, 2011 webcasts/2011/05/advanced-3-d-imaging-for-machine-vision.html.
  5. D. L. Lau, "3-D Imaging Advances Capabilities of Machine Vision: Part 1," Vision Systems Design, May 2012, pp. 19-22.
  6. D. L. Lau, "3-D Imaging Advances Capabilities of Machine Vision: Part 2," Vision Systems Design, June 2012, pp. 19-21.
  7. D. L. Lau, "3-D Imaging Advances Capabilities of Machine Vision: Part 3," Vision Systems Design, July 2012, pp. 21-23.
  8. D. L. Lau, "Integration Insights - Advanced 3-D Imaging for Machine Vision Applications," Vision Systems Design: Webcasts, October 23, 2012 pmny001/viewer/index.jsp?eventid=44355.
  9. D. L. Lau, "Integration Insights - 3D Imaging Methods and Their Applications," Vision Systems Design: Webcasts, October 15, 2013 viewer/index.jsp?eventid=47062&adid=ws.
  10. D. L. Lau, “Integration Insights - Understanding Applications and Methods of 3D Imaging,” Vision Systems Design: Webcasts, October 7, 2015 .
  11. D. L. Lau, “Integration Insights - Current and future 3D imaging applications and methods,” Vision Systems Design: Webcasts, Nov. 30, 2016. .
  12. D. L. Lau, “Integration Insights - How to develop embedded vision applications with off-the-shelf components,” Vision Systems Design: Webcasts, June 8, 2017 .

Books and Book Chapters
  1. C. J. Casey, L. G. Hassebrook and D. L. Lau, "Structured Light Illumination Methods for Continuous Motion Hand and Face-Computer Interaction," in Human-Computer Interaction, New Developments, International Journal of Advanced Robotic System, edited by K. Asai, published by In-Teh, Croation branch of I-Tech Education and Publishing KG, Vienna, Austria, 2008.

Journal Publications in Print
  1. C. Guan, L. G. Hassebrook, and D. L. Lau, "Composite structured light pattern for three-dimensional video," Optics Express, vol. 11, no. 5, March 2003, pp. 406-417.
  2. C. Guan, L. G. Hassebrook, D. L. Lau, and V. Yalla, "Near-Infrared Composite Pattern Projection for Continuous Motion Hand-Computer Interaction," Real-Time Imaging in Journal of Visual Communication and Image Representation, vol. 18, no. 2, April 2007, pp. 141-150.
  3. C. Guan, L. G. Hassebrook, D. L. Lau, V. G. Yalla, and C. J. Casey, "Improved Composite Pattern Structured Light Illumination by means of Post-Processing," Optical Engineering, vol. 47, no. 9, September 2008, DOI: 10.1117/12.819402.
  4. K. Liu, Y. Wang, D. L. Lau, Q. Hao and L. G. Hassebrook, "Dual-frequency pattern scheme for high-speed 3-D shape measurement," Optics Express, vol. 18, no. 5, March 1, 2010, pp. 5229-5244, DOI: 10.1364/OE.18.005229.
  5. K. Liu, Y. Wang, D. L. Lau, Q. Hao and L. G. Hassebrook, "Gamma model and its analysis for Phase Measuring Profilometry," Journal of the Optical Society of America A, vol. 27, no. 3, March 2010, pp. 553-562, DOI: 10.1364/JOSAA.27.000553
  6. Y. Wang, D. L. Lau, and L. G. Hassebrook, "Fit-sphere unwrapping and performance analysis of 3-D Fingerprints," Applied Optics, vol. 49, no. 4, April 2010, pp. 592-600. DOI: 10.1364/ AO.49.000592
  7. D. L. Lau, K. Liu, and and L. G. Hassebrook, "Real-Time Three-Dimensional Shape Measurement of Moving Objects without Edge Errors by Time Synchronized Structured Illumination," Optics Letters, vol. 35, no. 14, July 15, 2010, pp. 2487-2489. DOI: 10.1364/OL.35.002487
  8. Y. Wang, D. L. Lau, and L. G. Hassebrook, "Quality and matching performance analysis of three-dimensional unraveled fingerprints," Optical Engineering, vol. 49, no. 7, July 26, 2010, DOI: 10.1117/1.3465571
  9. Y. Wang, K. Liu, Qi Hao, D. L. Lau, and L. G. Hassebrook, "Maximum SNR Pattern Strategy in Phase Shifting Methods," Journal of the Optical Society of America A, vol. 27, no. 9, September 2010, pp. 1962-1971, DOI: 10.1364/JOSAA.27.001962.
  10. Y. Wang, L. G. Hassebrook, and D. L. Lau, "Data Acquisition and Processing of 3-D Fingerprints," IEEE Transactions on Information Forensics and Security, vol. 5, no. 4, December 2010, pp. 750-760, DOI: 10.1109/TIFS.2010.2062177.
  11. Y. Wang, K. Liu, Q. Hao, X. Wang, D. L. Lau, and L. G. Hassebrook, "Robust Active Stereo Vision Using Kullback-Leibler Divergence," IEEE Transactions on Pattern Analysis and Machine Intelligence, July 30, 2011, DOI: 10.1109/TPAMI.2011.162.
  12. Y. Wang, K. Liu, Q. Hao, D. L. Lau, and L. G. Hassebrook, "Period Coded Phase Shifting Strategy for 3-D Real-time Acquisition and Data Processing," IEEE Transactions on Image Processing, vol. 20, no. 11, November 2011, pp. 3001-3013, DOI: 10.1109/TIP.2011.2155072.
  13. R. R. Patel, K. D. Donohue, D. L. Lau, and H. Unnikrishnan, ``In Vivo Measurement of Pediatric Vocal Fold Motion Using Structured Light Laser Projection,'' Journal of Voice, Vol. 27, No. 4, July 2013, pp. 463-472, DOI: 10.1016/J.JVOICE.2013.03.004.
  14. K. Liu, S. Wang, D. L. Lau, K. E. Barner, and F. Kiamilev, "Nonlinearity calibrating algorithm for structured light illumination," Optical Engineering Letters, Vol. 53, No. 5, May 07, 2014, DOI: 10.1117/1.OE.53.5.050501.
  15. A. N. Shelley, D. L. Lau, A. E. Stone, and J. M. Bewley, “Short communication: Measuring feed volume and weight by machine vision,” Journal of Dairy Science, vol. 9, no. 1, 2016, pp. 1-6.

Conference Publications
  1. L. G. Hassebrook and D. L. Lau, "Composite Pattern Projection For Real-Time 3D Video Acquisition," DARPA 3D Data Workshop, Arlington VA USA, May 2002.
  2. C. Guan, L. G. Hassebrook, and D. L. Lau, "Real-time 3-D Data Acquisition for Augmented Reality Man and Machine Interfacing," Geo-Spatial and Temporal Image and Data Exploitation III, N. L. Faust, W. E. Roper; Eds., Proceedings of SPIE, vol. 5097, August 2003, pp. 50-61.
  3. C. Guan, L. G. Hassebrook, and D. L. Lau, "Optical processing of composite pattern structured light projection for high-speed depth measurement," Optical Information Systems II, B. Javidi and D. Psaltis; Eds., Proceedings of SPIE, vol. 5557, August 2004, pp. 50-61.
  4. C. Guan, L. G. Hassebrook, D. L. Lau, and V. G. Yella, "Composite Pattern Structured Light Illumination for Human Computer Interaction in Space," in Spaceborne Sensors II, P. Tchoryk and B. Holz, Eds., Proceedings of SPIE, vol. 5798, May 2005, pp. 15-25.
  5. W. Su, L. G. Hassebrook, and D. L. Lau, "Active pattern projection for increasing range of pulsed range sensors," in Spaceborne Sensors II, P. Tchoryk and B. Holz, Eds., Proceedings of SPIE, vol. 5798, May 2005, pp. 91-100.
  6. A. Fatehpuria, D. L. Lau, L. G. Hassebrook, "Acquiring a 2D rolled equivalent fingerprint image from a non-contact 3D finger scan," in Biometric Technology for Human Identification III, P. J. Flynn and S. Pankanti; Eds., Proceedings of SPIE, vol. 6202, April 2006, pp. 116-123.
  7. X. Xun, W. Su, R. W. Cohn, L. G. Hassebrook, D. L. Lau, "Expanding range of pulsed range sensors with active projection from spatial light modulators," in Spaceborne Sensors III, R. T. Howard, R. D. Richards; Eds., Proceedings of SPIE, vol. 6220, May 2006.
  8. L. G. Hassebrook, C. J. Casey, V. Yalla, Q. Hao, and D. L. Lau, "Super-resolution structured light illumination," in Sensors and Systems for Space Applications: Camera Based Sensing, B. E. Rogowitz, T. N. Pappas, and S. J. Daly; Eds. Proceedings of SPIE, vol. 6555, April 2007.
  9. W. Wang, Q. Hao, K. Liu, D. L. Lau, and L. G. Hassebrook, "Multicamera phase measuring profilometry for accurate distance measurement," in Sensors and Systems for Space Applications: Camera Based Sensing, B. E. Rogowitz, T. N. Pappas, and S. J. Daly; Eds. Proceedings of SPIE, vol. 6555, April 2007.
  10. W. Wang, Q. Hao, A. Fatehpuria, D. L. Lau, and L. G. Hassebrook, "Data Acquisition and Quality Analysis of 3-Dimensional Fingerprints," in Proceedings of the IEEE Conference on Biometrics, Identity and Security, Tampa, FL, Sep. 22-24, 2009.
  11. M. W. Bellis and D. L. Lau, “Measurement of human subjects using structured light,” in Emerging Digital Micromirror Device Based Systems and Applications IV, M. R. Douglass and P. I. Oden; Eds. Proceedings of SPIE, vol 82540F, Feb. 9, 2012.
  12. T. Wang, R. R. Souleyrette, D. L. Lau, and X. Peng, “Rail Highway Grade Crossing Rough-ness Quantitative Measurement Using 3D Technology,” Proceedings of the Joint Rail Conference, JRC 2014-3778, Colorado Springs, April 2014.

  1. L. G. Hassebrook, D. L. Lau, and C. Guan, "System and technique for retrieving depth information about a surface by projecting a composite image of modulated light patterns," U. S. Patent #7,440,590, October 21, 2008.
  2. L. G. Hassebrook, D. L. Lau, and C. Guan, "System and Technique for Retrieving Depth Information about a Surface by Projecting a Composite Image of Modulated Light Patterns," U. S. Patent #7,844,079, November 30, 2010.
  3. K. Liu, Y. Wang, D. L. Lau, and L. G. Hassebrook, "Dual-Frequency Phase Multiplexing (DFPM) and Period Coded Phase Measuring (PCPM) Pattern Strategies in 3-D Structured Light Systems and Look-Up Table Based Processing," U. S. Patent Application #2012/0092463 A1, April 19, 2012.
  4. L. G. Hassebrook, D. L. Lau, and H. Dietz, "System and method for 3D imaging using structured light illumination," U. S. Patent #8,224,064, July 17, 2012.
  5. L. G. Hassebrook, D. L. Lau, and C. Casey, "Lock and hold structured light illumination," U. S. Patent #8,224,068, July 17, 2012.

Advised PhD Dissertations
  1. Yongchang Wang, "Novel Approaches in Structured Light Illumination", University of Kentucky, Department of Electrical and Computer Engineering, May 2010.
  2. Kai Lui, "Real-Time Structured Light Illumination," University of Kentucky, August 2010 (anticipated).
  3. Eric Dedrick, "High Dynamic Range Imaging for Structured Light Illumination," University of Kentucky, May 2011.

Advised Master's Thesis
  1. Abishika Fatehpuria, "Performance Evaluation of Non-Contact 3-D Fingerprint Scanner," University of Kentucky, August 2006.
  2. Yongchang Wang, "Performance Analysis of 3-Dimensional Fingerprint Scan System", University of Kentucky, May 2008.
  3. Brent Bondehagen, "FPGA Based Implementation of Dual-Frequency Pattern Scheme for 3-D Shape Measurement," University of Kentucky, May 2013 (with Robert Heath).
  4. Anthony Shelly, "3D Imaging For Measuring Feed Intake," University of Kentucky, May 2013.

Awarded Grants (over $7,000,000 in total funding, $2,467,000 as PI, arranged by start date)
  1. L. G. Hassebrook, D. L. Lau, and B. Seales, "Real-Time 3D Video Acquisition For Head and Hand Tracking In Augmented Reality," Kentucky NASA EPSCoR, $24,829, July 1, 2002 to June 30, 2003.
  2. D. L. Lau, L. G. Hassebrook, and K. Donohue, "Active-Range Sensing Video Camera," University of Kentucky Major Research Equipment Grant, $46,000, January 1, 2004 to February 15, 2004.
  3. L. G. Hassebrook, D. L. Lau, J. Stockley (Boulder Non-Linear Systems), and T. H. Chao (NASA JPL), "Real-Time Range Sensing Video Camera for Human/Robot Interfacing," NASA STTR Phase I, $100,000, January 14, 2004 to January 13, 2005.
  4. D. L. Lau, "Construction of 3-D Database to Support Research in Face Recognition and Human Gesture Recognition," KY NSF EPSCOR Summer Research Program, $28,435, June 7, 2004 to July 30, 2004.
  5. L. G. Hassebrook and D. L. Lau, "Hybrid Range Sensing Camera For High Lateral and Depth Resolution Imaging," Kentucky NASA EPSCoR, $24,421, September 1, 2004 to August 31, 2005.
  6. L. G. Hassebrook, D. L. Lau, and R. Deiter, "Large Area, Structured-Light Illumination Scanner," Toyota, Georgetown, KY, $200,000, September 1, 2005 to August 31, 2005.
  7. D. L. Lau, L. G. Hassebrook, C. Jaynes, R. Yang, R. Cohn, and R. Byrd, "Active and Passive Range Sensor Fusion for Automated Surveillance and Face Recognition," Homeland Security, $650,000, January 1, 2004 to December 31, 2006.
  8. L. G. Hassebrook, D. L. Lau, and H. Dietz, "Hometown Security: Real-Time, 3D Finger and Palm-Print Scanner for Entry and Access Portal Security," Eastern KY University, $859,896, July 1, 2005 to June 30, 2008.
  9. D. L. Lau and L. G. Hassebrook, "3D scans of humans to extract biometric signatures of identity and intent," University of Louisville, $36,000, January 1, 2006 to April 30, 2006.
  10. L. G. Hassebrook and D. L. Lau, "High Performance 3-Dimensional Surface Scanning," Michigan Aerospace Inc. Phase II NASA SBIR subcontract, $50,000, July1, 2006 to December 30, 2006.
  11. L. G. Hassebrook and D. L. Lau, "Facial Expression 3-D Scanner," Gentle Giant Studios, Inc., $59,802, May 22, 2006 through May 21, 2007.
  12. L. G. Hassebrook and D. L. Lau, "Rolled Equivalent 3-D Fingerprint and Palm Print Scanner," National Institute for Hometown Security, $988,511, January 1, 2009 through August 31, 2010.
  13. R. Souleyrette and D. L. Lau, "NURail," University of Illinois, $295,611, February 2, 2012 through January 31, 2016.
  14. J. Bewley and D. L. Lau, "KSEF RDE: Automation of Dairy Cattle Body Condition Scoring through Image Processing," KY Science and Technology Co. Inc., $49,872, July 1, 2012 through June 30, 2014.
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