title: Optical edge-projection method for three-dimensional profilometry.
abstract: A novel optical edge-projection method is proposed for surface contouring of an object with low reflectivity. A structured light edge is projected onto a dark surface, and the image is captured by a CCD camera. The object contour is evaluated with an active triangular projection algorithm, and one obtains a whole-field three-dimensional contour of the object by scanning the optical edge over the entire object surface. The proposed method is applied to a black nonreflective object made from woven carbon fiber and is also applied to measure the profile of a small object (a coin). The results show that an accurate profile of the specimen can be obtained.
authors.affiliation: Department of Mechanical Engineering, National University of Singapore.
authors.forename: C J
authors.initials: CJ
authors.lastname: Tay
authors.forename: H
authors.initials: H
authors.lastname: Miao
authors.forename: Y
authors.initials: Y
authors.lastname: Fu
mesh_terms: D000465:Algorithms; D019781:Corneal Topography / Q000295:instrumentation* / Q000379:methods; D004867:Equipment Design; D019544:Equipment Failure Analysis; D007089:Image Enhancement / Q000295:instrumentation* / Q000379:methods; D007090:Image Interpretation, Computer-Assisted / Q000295:instrumentation* / Q000379:methods; D021621:Imaging, Three-Dimensional / Q000295:instrumentation* / Q000379:methods; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity