NEW CONCEPT OF A PHOTOGRAMMETRY SYSTEM WITH ADAPTED ”INTELLIGENT” ILLUMINATION FOR 3D-SHAPE CAPTURE USING COMPUTERGENERATED HOLOGRAMMS

A. Bai, M. Zacher, T. Pfeifer

Abstract

A non-contact measurement system, based on the principle of photogrammetry, developed at the Fraunhofer IPT, permits a highly exact 3D-shapemeasurement of objects. Because of the limited depth focus of the projection lens used, the axial measurement range is reduced to only a few centimetres. In order to digitize the 3D-shape of technical objects of various dimensions, the structured illumination on the object surface must be in focus for each axial depth. The principle of holographic projection offers a crucial benefit, in order to project a sharp pattern in any plane. By applying computer generated holograms for projection of patterns, further depth information can be encoded. Only this allows the measuring of 3Dshapes in one step.

Keywords

photogrammetry, optical 3D-measurement, holography, structured illumination

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IMEKO-WC-2000-TC14-P354.pdf

DOI

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IMEKO TC

TC14 - Measurement of Geometrical Quantities

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