Fast and flexible shape control with adaptive LCD fringe masks

摘要

Fast analysis of 3D shape deviations is obtained with fringe projection combined with moire filtering. A method is presented where an object adapted fringe mask is written in an matrix LCD and projected onto the test object. The object is detected by a CCD camera. Perfect objects yield regular fringe patterns, shape deviations result in distorted fringes. For moire filtering the periodic structure of the detecting CCD chip is exploited, therefore no image postprocessing is required, testing at video frame rate is possible.