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Performing Stereo-Measurements with Optimal Patterns Processed by Localised Spectrum Analysis.

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Title: Performing Stereo-Measurements with Optimal Patterns Processed by Localised Spectrum Analysis.
Authors: Jailin, T.1 (AUTHOR) thomas.jailin@uca.fr, Blaysat, B.1,2 (AUTHOR) benoit.blaysat@uca.fr, Vinel, A.1 (AUTHOR) adrien.vinel@sigma-clermont.fr, Langlois, R.1,3 (AUTHOR) raphael.langlois@ens-paris-saclay.fr, Sur, F.4 (AUTHOR) frederic.sur@loria.fr, Grédiac, M.1 (AUTHOR) michel.grediac@uca.fr
Source: Experimental Mechanics. Nov2025, Vol. 65 Issue 9, p1461-1472. 12p.
Subjects: Stereo image, Stereo image processing, Metrology, Measuring instruments, Acquisition of data, Digital image correlation
Abstract: Background: Localised Spectrum Analysis is a full-field measurement method which enables processing optimal patterns (i.e. checkerboard patterns) and obtaining high metrological performance. However, LSA was still limited to 2D cases. Objective: This paper presents stereo-LSA, an extension of the method for stereo image pairs, enabling the measurement of the 3D displacement field on sample surfaces engraved with optimal checkerboard patterns. Methods: A standard stereo procedure is followed. The LSA formulation is updated to take into account global rotations induced by the stereo angle. Results: The technique is applied to three different cases. A synthetic case is used to validate the stereo implementation, and a comparison is proposed with stereo digital image correlation, routinely used in the community. Conclusions: Stereo-LSA enables measuring 3D-displacement field on a sample surface prepared with checkerboard patterns, leading to high metrological performance. [ABSTRACT FROM AUTHOR]
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Database: Engineering Source
Description
Abstract:Background: Localised Spectrum Analysis is a full-field measurement method which enables processing optimal patterns (i.e. checkerboard patterns) and obtaining high metrological performance. However, LSA was still limited to 2D cases. Objective: This paper presents stereo-LSA, an extension of the method for stereo image pairs, enabling the measurement of the 3D displacement field on sample surfaces engraved with optimal checkerboard patterns. Methods: A standard stereo procedure is followed. The LSA formulation is updated to take into account global rotations induced by the stereo angle. Results: The technique is applied to three different cases. A synthetic case is used to validate the stereo implementation, and a comparison is proposed with stereo digital image correlation, routinely used in the community. Conclusions: Stereo-LSA enables measuring 3D-displacement field on a sample surface prepared with checkerboard patterns, leading to high metrological performance. [ABSTRACT FROM AUTHOR]
ISSN:00144851
DOI:10.1007/s11340-025-01217-7