Reverse Engineering in Combination with Digital Photogrammetry

Abstract

An online procedure which includes both the digitization of a physical model by means of a photogrammetric measurement system and the CAD based surface description, will be introduced. The CAD system creates class A quality surfaces. With the same procedure, it is possible to update a given CAD model by means of the new raw data (sequences of sample points) taken from a modified physical model. The procedure preserves the structure and parameter distribution of the original surface description in the updated version. The 3D point data from ICEM PHOTO can be obtained in a form suited well for surface construction. The advantage of ICEM PHOTO is that we can avoid the handling of masses of unsorted point data because of filtering. In the last stage of the digital image evaluation we obtain raw data point clouds tailored for surfacing with regard to density and position. The usage of the digital photogrammetric method and the concepts of the methods used for Reverse Engineeringwill be outlined in this paper.