Surface contouring by optical edge projection based on a continuous wavelet transform
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 triangula...
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| Main Authors: | , , |
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| Other Authors: | |
| Format: | Article |
| Language: | English |
| Published: |
2010
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| Subjects: | |
| Online Access: | https://hdl.handle.net/10356/91919 http://hdl.handle.net/10220/6469 |
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| Institution: | Nanyang Technological University |
| Language: | English |
| Summary: | 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. |
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