• Prof.  Zonghua Zhang
  • Prof. Zonghua Zhang
  • Hebei University of Technology, China
  • Title: Phase calculation-based fast 3D shape measurement by using multiple color channels technique
  • Abstract:

    Fast measuring 3D shape of objects surface in real time is becoming more and more important in many application fields and academia. Phase calculation-based fringe projection techniques are mostly studied research fields because of the advantages of non-contact operation, full-field acquisition, high accuracy, fast data processing and low cost. With the development of color projecting and imaging techniques, multiple color channels have been widely studied to reduce the acquisition time of 3D measurement.

    This talk will review the existing multiple color channels methods to fast capture 3D shape of the object surface by using major visible red, green, and blue channels of the projecting and imaging devices. Three fringe patterns are coded into the red, green and blue channels to generate a composite color fringe pattern image, so the acquisition time reduces to 1/3 of the value by the gray fringe pattern projection. A DLP (Digital Light Processing) projector is normally used to project the composite color fringe pattern image onto the measured object surface. From another point of view, the fringe patterns are simultaneously captured by a color CCD camera. Phase data are calculated from the captured fringe patterns and then converted into 3D shape data. Some experiments will be shown to demonstrate the validity of fast measuring 3D shape of an object. This talk also introduces one novel method to code fringe pattern into the Infrared (IR) channel, so that environmental light has no effect on the measured 3D shape. The fringe patterns in visible color channels are used to determine the absolute fringe order of each point, while the fringe patterns captured through IR channel are used to calculate the phase information. Therefore, the obtained 3D shape data are insensitive to environmental light and have high accuracy. Experimental results on measuring some moving objects show that the proposed method can fast obtain 3D shape data.

  • Biography:
    Zonghua Zhang obtained his B.S., M.S. and Ph.D degrees from the College of Precision Instrument and Opto-electronics Engineering,Tianjin University,China, in 1992, 1998 and 2000, respectively. From Jan. 2001 to Sep. 2002, he was a postdoctoral researcher in Mechanical Engineering,TianjinUniversity. From 2003 to 2009, he was in Ruhr University Bochum of Germany, Queen’s University of Canada, Heriot-Watt University and University of Leeds of UK. In Mar. 2009, he came to the Hebei University of Technology. Now he is a Professor in the School of Mechanical Engineering and the Deputy Director of the Institute of Modern Measurement & Control Technology. He has published more than 80 journal and conference papers, 4 book chapters, 3 international and Chinese patents. 
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Important Dates
Conference:
November 28-30, 2014
Paper or Abstract Submission Due:
October 17, 2014
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