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Title: Surface contouring by optical edge projection based on a continuous wavelet transform
Authors: Quan, C. 
Miao, H. 
Fu, Y. 
Issue Date: 10-Jul-2006
Citation: Quan, C., Miao, H., Fu, Y. (2006-07-10). Surface contouring by optical edge projection based on a continuous wavelet transform. Applied Optics 45 (20) : 4815-4820. ScholarBank@NUS Repository.
Abstract: A novel optical edge projection method for surface contouring of an object with low reflectivity is presented. A structured light edge is projected onto a dark surface, and the image is captured by a CCD camera. The surface profile of the object is then evaluated by an active triangular projection technique, and a whole-field three-dimensional contour of the object is obtained by scanning the optical edge over the entire object surface. An edge detection method based on a continuous wavelet transform (CWT) is employed to determine the location of the optical edge. The method of optical edge detection is described, and characteristic details of gray-level distribution along the edge are analyzed. It is shown that the proposed wavelet edge detection method is not dependent on any threshold values; hence the true edge position can be determined without subjective selection. A black low-reflectivity object surface made from woven carbon fiber is measured, and the experimental results show that the profile of a woven carbon fiber can be obtained by the proposed method. © 2006 Optical Society of America.
Source Title: Applied Optics
ISSN: 00036935
DOI: 10.1364/AO.45.004815
Appears in Collections:Staff Publications

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