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|Title:||Surface contouring by optical edge projection based on a continuous wavelet transform|
|Authors:||Quan, C. |
|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. https://doi.org/10.1364/AO.45.004815|
|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|
|Appears in Collections:||Staff Publications|
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