October 13, 2017: Invited Speaker Seminar: Active 3D Imaging Based on White Light Scanning: From Single Sensor to Sensor Networks

Dr. Xiang Peng
Shenzhen University

Friday, October 13, 2017 at 2:00 pm
Room EV003.309

Abstract

Active 3D imaging based on white light scanning is an efficient technique which can digitize objects existing in the physical world, in order to acquire 3D images of test targets. A light coding with a series of structured light patterns, for example fringe patterns, are usually applied for such a 3D imaging modality. A single optical 3D sensor based on fringe projection or 3D optical sensor network composed of multiple node sensors can be regarded as a kind of optical instrument that works on the principle of computational imaging. In order to reconstruct a 3D image it is necessary to decode the fringe pattern to get the phase map that acts as special marks encoding each point of test object or scene, resulting in accurate determination of point correspondence. Once the homologous pairs are identified precisely, a 3D image can be obtained through a series of computations using a stereoscopic vision theory. This presentation will talk about the working principle of an optical digitizer based on the strategy of phase-aided active imaging (PAAI) and that of 3D sensor network composed of multiple PAAI sensors. In addition, many potential applications in 3D body scanning, face scanning, and heritage digitizing will also be addressed in this talk to show the great potential of 3D optical digitizers based on the PAAI strategy and PAAI-based optical measurement network.

Biography

Dr. Xiang Peng received his B.S., M.S., and Ph.D. from Tianjin University in 1981, 1984, and 1989, respectively, all in Optical Engineering. His doctorate dissertation involved laser speckle statistics and its application to velocimetry with a photo-counting technique. From July 1985 to July 1986, he was a visiting scholar at the Department of Electrical and Electronic Engineering, University of Houston, TX, USA. From August 1990 to June 1992, Dr. Peng was awarded a fellowship by Alexander von Humboldt Foundation, Germany. He worked with the Institute of Applied Optics (ITO) at University of Stuttgart as an Alexander von Humboldt Fellow. Dr. Peng’s research activities at ITO involved electronic speckle pattern interferometry and its application to 3D contouring. Since October 1984, Xiang Peng has been with Tianjin University as Assistant Professor, Associate Professor (1992), and Full Professor (1998). He joined Shenzhen University in January 2003 and has been keeping his position as Adjunct Professor at Tianjin University. Dr. Peng has also been Adjunct Professor since 2007 at Clemson University, NC, USA. Dr. Peng held several visiting positions at University of Calgary, CA, in 1999 and at the Hong Kong University of Science and Technology (HKUST) in 1996, 1998, 2001, respectively. Dr. Peng’s research work in Calgary involved Reverse Engineering with the help of 3D imaging and Modeling, and his research activities at HKUST involved Optical Security. Dr. Peng’s current research interests include Optical Imaging, Metrology, and Optical Security. Dr. Peng has numerous publications in refereed journals and was awarded more than 20 inventions wherein a dozen of patents have been transferred to ESUN Co. Ltd., a listed company in Shenzhen. He also serves as the Director of Engineering Laboratory for 3D imaging and modeling of Shenzhen Government and senior technical consultant at ESUN Co. Ltd. At the College of Optoelectronics Engineering (COE) of Shenzhen University, Dr. Peng is leading a research group to conduct research in the areas of 3D imaging and modeling, computational optical imaging, and optical security. Dr. Peng’s research activities have been supported by Natural Science Foundation of China (NSFC), Sino-German Center for Research Promotion (SGCRP), the Natural Science Foundation of Local Governments of Guangdong Province and Shenzhen city, and by the Industrial Sectors.