METHOD AND APPARATUS FOR THREE-DIMENSIONAL SURFACE CONTOURING USING A DIGITAL VIDEO PROJECTION SYSTEM

摘要

A three-dimensional surface contouring method is based on the full-field fringe projection technique. A digital video projection system (18) is used to project digitally created fringe patterns onto the object (12). The fringe pattern distorted by the geometry of the object surface (14) is then captured by a high resolution CCD camera (20). To increase contouring resolution, purely software-based digital phase shifting technique is used, which eliminates the need for accurate positioning systems in the traditional phase shifting methods. The surface (14) is reconstructed by applying the phase wrapping and unwrapping algorithms.