COLOR FRINGE PROJECTION FOR 3-D TOPOGRAPHY

Abstract

Holography and projection Moire are well known techniques to obtain topographical information of a surface from a two dimensional image. Due to the image processing advances made in the area of computer vision these techniques are becoming more popular for machine vision inspection applications. This thesis reviews the current holographic and projection Moire techniques and shows some of the practical limitations. Work was carried out to use techniques based on holography for machine vision applications. Through this work a novel idea was developed to resolve the topography of an object, making it more attractive for an industrial environment. The idea is based on projecting three sinusoidal gratings, each being of a primary color, simultaneously onto a surface and recording the resulting intensity patterns with a color camera. Experimental results are presented which show the topographic contour of several objects.