30 May 2003 Influence of the pixel size of the camera in 3D measurements with fringe projection
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Abstract
The projection of fringes onto objects in some 3D-measurement systems has two main reasons: First, to solve the problem of homologous points for the camera images and second, to create a continuous metric in the object space. The second effect leads to the well-known sub-pixeling accuracy. The accuracy of such measurement systems is not limited by the pixel size of the camera. But, depending on some surface-discontinuities (i.e. steps) and the viewing direction of the camera, this principle is not valid for a certain number of pixels. When a camera is viewing "downstairs," these pixels get the phase information from the upper and the lower step. By using our very precise measurement system kolibri, this effect is evident on most complex technical surfaces and is clearly distinguished from statistical noise. We discuss the different circumstances of this effect and give a well-adapted algorithm for eliminating these errors.
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Peter Brakhage, Peter Brakhage, Matthias Heinze, Matthias Heinze, Gunther Notni, Gunther Notni, Richard Kowarschik, Richard Kowarschik, } "Influence of the pixel size of the camera in 3D measurements with fringe projection", Proc. SPIE 5144, Optical Measurement Systems for Industrial Inspection III, (30 May 2003); doi: 10.1117/12.500646; https://doi.org/10.1117/12.500646
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