Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE · 1994 · 11 citations · 0 references
EngineeringComputer Science3D ModelingMachine VisionOptics3D ImagingCamera GeometryCoordinate MeasurementOptical Metrology3D MeasurementFringe AnalysisMachine Vision SystemsOptical Coordinate MeasurementStructured LightThree-dimensional Coordinate MeasurementThree-dimensional MeasurementThree-dimensional Shape Measurement
The measurement of three-dimensional object shapes plays an important role in machine vision, solid modeling and other industrial applications. Well known optical methods for 3D- shape inspection are moire-techniques and contouring. Unfortunately, as a rule they are lacking because they measure only one coordinate, i.e., the height above a reference surface. The other coordinates in the reference plane have to be determined using the pixel distance of the observing CCD-camera or by other means. Here, we demonstrate a real 3D-coordinate measuring system using fringe projection techniques where the scale of coordinates is given by the illumination-structures. This method has the advantage that the aberration of the observing system and the depth-dependent imaging scale have no influence on the measuring accuracy. Moreover, the measurements are independent of the position of the camera with respect to the object under test.