Reverse Engineering of Quadric Surfaces Employing Three-Dimensional Laser Scanning

Abstract

A software package for the reverse engineering of surface forms commonly found in manufactured objects is presented. An object's surface is digitized using a three-dimensional, laser-based scanner that produces accurate and copious data files. Complex surface forms are reconstructed by interactively segmenting the multiple-surface patches, invoking the appropriate surface modelling routine and transferring the resulting surfaces to a CAD package via a standard IGES entity. Examples of the accuracy of the laser scanner data, and software algorithms for modelling planes, cylinders, cones and spheres, are presented by performing comparisons with results generated by a coordinate measuring machine. The paper concentrates on the novel software process to model the principal quadric forms; however, the program's capabilities do extend to free-form surfaces.

Digital Custom Denture Design With New Abrasive Computer Tomography and Rapid Prototyping Technologies

“…15 No. 3 June 2003 dentures but require grinding healthy adjacent healthy teeth to stubs before fabrication new prostheses.…”

“…A number of systems based on optical methods have been developed and commercized. For example, laser scanners have a very high data rate (up to 2500-3500 points per second) and good resolution (the order of 5-10 vm) [14][15]. But, laser scanners are so sensitive to the surroundings of light that the accuracy of measurement is easily affected.…”

Reverse engineering of composite sculptured surfaces

“…Takagi et al [2] and Hosni and Ferreira [3] described two laserprobe-based measuring systems for acquiring the x, y, z coordinates of multiple points on the part surface. Bradley et al [4,5] proposed methods for building quadratic and freeform surface models by use of a CMM mounted with a laser scanner. They later applied the above system, combined with an NC path generation algorithm, for quasi-helical tool path generation of arbitrary curved surface models [6].…”

Geometric Feature Detection for Reverse Engineering Using Range Imaging

“…Reverse engineering 1.2. Previous Work (RE) is gaining increasing attention for its capability to improve productivity [1]. From a narrower view point, RE Previous research on vision-based geometric feature extraction can broadly be classified into three categories: explores the methodologies that use certain equipment to measure the given objects, reconstruct or recover the model-based statistics regression, primitive surface fitting, and Hough transformation (HT).…”

“…From a narrower view point, RE Previous research on vision-based geometric feature extraction can broadly be classified into three categories: explores the methodologies that use certain equipment to measure the given objects, reconstruct or recover the model-based statistics regression, primitive surface fitting, and Hough transformation (HT). In traditional modelgeometry of the objects, and rapidly fabricate the prototypes of the models.based statistical approaches, a model base including plane, cylinder, cone, sphere, etc., is generally required to be set Coordinate measuring machines (CMMs) are commonly used in the current RE context for object measurement up for the extraction process [1]. Parameters such as sphere and cylinder radii are estimated based on the theory of and inspection.…”