Evaluation of expansion algorithm of measurement range suited for 3D shape measurement using two pitches of projected grating with light source-stepping method

Toshimasa Sakaguchi; Motoharu Fujigaki; Yorinobu Murata

doi:10.1117/12.2084907

4 March 2015 Evaluation of expansion algorithm of measurement range suited for 3D shape measurement using two pitches of projected grating with light source-stepping method

Toshimasa Sakaguchi, Motoharu Fujigaki, Yorinobu Murata

Author Affiliations +

Proceedings Volume 9302, International Conference on Experimental Mechanics 2014; 930228 (2015) https://doi.org/10.1117/12.2084907
Event: International Conference on Experimental Mechanics 2014, 2014, Singapore, Singapore

Abstract

Accurate and wide-range shape measurement method is required in industrial field. The same technique is possible to be used for a shape measurement of a human body for the garment industry. Compact 3D shape measurement equipment is also required for embedding in the inspection system. A shape measurement by a phase shifting method can measure the shape with high spatial resolution because the coordinates can be obtained pixel by pixel. A key-device to develop compact equipment is a grating projector. Authors developed a linear LED projector and proposed a light source stepping method (LSSM) using the linear LED projector. The shape measurement euipment can be produced with low-cost and compact without any phase-shifting mechanical systems by using this method. Also it enables us to measure 3D shape in very short time by switching the light sources quickly. A phase unwrapping method is necessary to widen the measurement range with constant accuracy for phase shifting method. A general phase unwrapping method with difference grating pitches is often used. It is one of a simple phase unwrapping method. It is, however, difficult to apply the conventional phase unwrapping algorithm to the LSSM. Authors, therefore, developed an expansion unwrapping algorithm for the LSSM. In this paper, an expansion algorithm of measurement range suited for 3D shape measurement using two pitches of projected grating with the LSSM was evaluated.

Citation Download Citation

Toshimasa Sakaguchi, Motoharu Fujigaki, and Yorinobu Murata "Evaluation of expansion algorithm of measurement range suited for 3D shape measurement using two pitches of projected grating with light source-stepping method", Proc. SPIE 9302, International Conference on Experimental Mechanics 2014, 930228 (4 March 2015); https://doi.org/10.1117/12.2084907

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KEYWORDS

3D metrology

Light sources

Projection systems

Light emitting diodes

Phase shifts

Cameras

Diffraction gratings

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