Resolution improvement in speckle displacement and strain sensor by correlation interpolation

Tamiki Takemori; Katsuyoshi Fujita; Ichirou Yamaguchi

doi:10.1117/12.135299

1 January 1992 Resolution improvement in speckle displacement and strain sensor by correlation interpolation

Tamiki Takemori, Katsuyoshi Fujita, Ichirou Yamaguchi

Proceedings Volume 1553, Laser Interferometry IV: Computer-Aided Interferometry; (1992) https://doi.org/10.1117/12.135299
Event: San Diego, '91, 1991, San Diego, CA, United States

Abstract

A new correlator which outputs 48 correlation values around the correlation peak is described, and several interpolation methods for the detection of the displacement of a speckle pattern with less than one pixel resolution of the linear image sensor are experimentally compared. The correlator is capable of computing the correlation function between the current frame and a reference frame. The use of the new correlator in conjunction with interpolation methods makes it possible to obtain the best value of the resolution for the speckle displacement of less than 0.2 pixels.

Citation Download Citation

Tamiki Takemori, Katsuyoshi Fujita, and Ichirou Yamaguchi "Resolution improvement in speckle displacement and strain sensor by correlation interpolation", Proc. SPIE 1553, Laser Interferometry IV: Computer-Aided Interferometry, (1 January 1992); https://doi.org/10.1117/12.135299

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