Binocular vision measurement and its application in full-field convex deformation of concrete-filled steel tubular columns. (December 2018)

• Record Type: Journal Article
• Authors: Tang, Yun-Chao; Li, Li-Juan; Feng, Wen-Xian; Liu, Feng; Zou, Xiang-Jun; Chen, Min-You
• Is Part Of: Measurement. Volume 130(2018)
• Page Start: 372
• Page End: 383
• Publication Date: 2018-12
• Subjects: Non-contact measuring -- Image processing -- 3D reconstruction -- Full-field strain -- Convex curved deformation; Weights and measures -- Periodicals; Measurement -- Periodicals; Measurement; Weights and measures; Periodicals; 530.8
• DOI: 10.1016/j.measurement.2018.08.026
• Languages: English
• ISSNs: 0263-2241

Abstract

Highlights: The binocular vision-based measurement method is proposed. The vision system containing image acquisition, processing and calculation is constructed. The non-contact method results truly reflect the deformation process and full-field strain values. Relative error of binocular vision method is 0.19% for displacement and 0.20% for strain. The proposed method can be used as a reasonable alternative to traditional contact method. Abstract: This paper presents a non-contact 3D deformation measurement method based on binocular vision. The proposed method was tested in the determination of the deformation and strain of concrete-filled steel tubes. Based on the proposed image-processing algorithm and the principle of 3D deformation measurement, the least-square-based circle-fitting algorithm was presented in this article and was applied to binocular vision systems for the static and dynamic collection of full-field 3D deformation data in concrete-filled steel tubular columns. Three-dimensional reconstruction was performed, and the results obtained were compared with those of a contact measuring tool. The test results showed that the mean relative errors of the maximum convex diameter in the visual static and dynamic measurements were 0.19% and 0.33%, respectively, and the mean relative error in the full-field strain in the visual measurement was between 0.20% and 0.49%, which shows that the proposed visual method comprehensively reflects the deformation process and full-field strain values of the components under engineering ISO Tolerance (IT7) accuracy requirements. This method can be used as a reasonable alternative to traditional contact measuring methods.