Improvement of the spatial resolution of an optical 3-D measurement procedure

3-D surface coordinates can be calculated by stereoscopic methods from the images of two CCD-cameras. Classical procedures based on matching algorithms cause systematic errors at strongly curved surfaces or steps in surfaces. In this paper, an alternative procedure is proposed. Instead of correlation of areas in two images, the grey values of single pixels are correlated originating from several successively taken different images. Thus it is possible to get higher spatial resolution and to reduce the systematic errors at “problem surfaces”