3D deformation measurement by digital speckle correlation method and stereo vision

Hua Chen; Gang Chen; Dong Ye; Rensheng Che

doi:10.1117/12.783189

27 November 2007 3D deformation measurement by digital speckle correlation method and stereo vision

Hua Chen, Gang Chen, Dong Ye, Rensheng Che

Proceedings Volume 6723, 3rd International Symposium on Advanced Optical Manufacturing and Testing Technologies: Optical Test and Measurement Technology and Equipment; 67231N (2007) https://doi.org/10.1117/12.783189
Event: 3rd International Symposium on Advanced Optical Manufacturing and Testing Technologies: Large Mirrors and Telescopes, 2007, Chengdu, China

Abstract

An advanced 3D deformation measurement method based on 2D digital speckle correlation method and stereo vision is proposed in the paper. The intrinsic parameters and extrinsic parameters of two digital CCD cameras have been calibrated. The speckle images of the specimen from different directions are recorded by two cameras before and after deformation. The deformation displacement and strain of the specimen are calculated from these speckle images by digital speckle correlation method and geometrical relation of stereography. The whole field deformation can be obtained by tracking the gray character of each surface point in a subset. A new correlation search method based on genetic algorithm is proposed, which gets rid of great computational complexity and bad quality of conventional correlation search methods. The performance of the method is demonstrated by real test.

Citation Download Citation

Hua Chen, Gang Chen, Dong Ye, and Rensheng Che "3D deformation measurement by digital speckle correlation method and stereo vision", Proc. SPIE 6723, 3rd International Symposium on Advanced Optical Manufacturing and Testing Technologies: Optical Test and Measurement Technology and Equipment, 67231N (27 November 2007); https://doi.org/10.1117/12.783189

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