A Measurement Method For The Description Of 3-D Scenes

A measurement method for the description of 3 -D scenesK. Steenhaut, J. Cornelis, M. Van den Broeck, J. Janssens *, E. NyssenVUB (Electronics Dept.) Pleinlaan 2, 1050 Brussels'RUCA Groenenborgerlaan 171, 2020 AntwerpAbstractThe method generates a set of 3 -D coordinates of points situated on surfaces of the observed 3 -D scene.It is based on a spatial triangulation technique combined with structured lighting. Projection of a 2 -Drectangular lattice allows the capture of all the available 3 -D information of the observed scene in onlyone 2 -D image. Precise alignment and positioning procedures of lightprojector and camera are avoided by anautomatic calibration method. After a short comparison with Moire -techniques, the principles of the methodand its mathematical formulation are described.IntroductionMany methods for the analysis of diffusely reflecting surfaces in 3 -D scenes and for the automaticmeasurement of 3 -D surface geometries from 2 -D images are based on structured illumination. Among thesemethods, Moire contouring and direct spatial triangulation are probably the most widely used.In Moire contouring, black and white fringes are generated on the scene. These fringes are lines ofequal depth. Although there have been many publications in recent 'ears, a number of problems remain un-