Stereo-Digital Image Correlation (DIC) measurements with a single camera using a biprism

Genovese, Katia; Casaletto, Luciana; Rayas, J. A.; Flores, Victor Humberto Orbegoso; Martı́nez, Amalia

doi:10.1016/j.optlaseng.2012.10.001

Cited by 99 publications

(38 citation statements)

References 24 publications

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“…However, some experimental conditions discourage the use of 3D-DIC, such as (1) high magnification, and therefore small depth of field [19], which can be an issue if the specimen deforms substantially in the out-of-plane direction, (2) a highly controlled environment during mechanical testing, which might limit the accessibility for two-angled cameras [20], (3) high-speed experiments, for which both cameras need to be perfectly synchronized [21], or (4) stiff membranes, for which the out-of-plane deformation is small and might not be accurately measured by 3D-DIC. Some of these conditions have motivated recent developments of techniques to measure 3D deformations using images acquired with a single camera [20–24]. Stereo-microscopy is also becoming increasingly popular for measurements on the microscale [25–27] however, it still suffers from a small depth of field at high magnification, a lower sensitivity in the out-of-plane measures compared to the in-plane measures [27] and a higher cost than traditional stereo-vision systems.…”

Section: Introductionmentioning

confidence: 99%

A comparison of 2D and 3D digital image correlation for a membrane under inflation

Murienne

Nguyen

2016

Optics and Lasers in Engineering

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Three-dimensional (3D) digital image correlation (DIC) is becoming widely used to characterize the behavior of structures undergoing 3D deformations. However, the use of 3D-DIC can be challenging under certain conditions, such as high magnification, and therefore small depth of field, or a highly controlled environment with limited access for two-angled cameras. The purpose of this study is to compare 2D-DIC and 3D-DIC for the same inflation experiment and evaluate whether 2D-DIC can be used when conditions discourage the use of a stereo-vision system. A latex membrane was inflated vertically to 5.41 kPa (reference pressure), then to 7.87 kPa (deformed pressure). A two-camera stereo-vision system acquired top-down images of the membrane, while a single camera system simultaneously recorded images of the membrane in profile. 2D-DIC and 3D-DIC were used to calculate horizontal (in the membrane plane) and vertical (out of the membrane plane) displacements, and meridional strain. Under static conditions, the baseline uncertainty in horizontal displacement and strain were smaller for 3D-DIC than 2D-DIC. However, the opposite was observed for the vertical displacement, for which 2D-DIC had a smaller baseline uncertainty. The baseline absolute error in vertical displacement and strain were similar for both DIC methods, but it was larger for 2D-DIC than 3D-DIC for the horizontal displacement. Under inflation, the variability in the measurements were larger than under static conditions for both DIC methods. 2D-DIC showed a smaller variability in displacements than 3D-DIC, especially for the vertical displacement, but a similar strain uncertainty. The absolute difference in the average displacements and strain between 3D-DIC and 2D-DIC were in the range of the 3D-DIC variability. Those findings suggest that 2D-DIC might be used as an alternative to 3D-DIC to study the inflation response of materials under certain conditions.

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Section: Introductionmentioning

confidence: 99%

A comparison of 2D and 3D digital image correlation for a membrane under inflation

Murienne

Nguyen

2016

Optics and Lasers in Engineering

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“…Furthermore, the same approach can be used in 3D object space to correct the result of 3D measurements directly or to undistort images. Genovese et al [21] used an additional complicated equipment and the second camera without a prism to measure deviations of 3D coordinates for thousands of control points in the working volume to obtain correction tables.…”

Section: Fig 1 the Data Processing Pipeline Of A 3d Measurement Endmentioning

confidence: 99%

Optimal calibration of a prism-based videoendoscopic system for precise 3D measurements

Gorevoy¹,

Мачихин²

2017

Computer Optics

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Modern videoendoscopes are capable of performing precise three-dimensional (3D) measurements of hard-to-reach elements. An attachable prism-based stereo adapter allows one to register images from two different viewpoints using a single sensor and apply stereoscopic methods. The key condition for achieving high measurement accuracy is the optimal choice of a mathematical model for calibration and 3D reconstruction procedures. In this paper, the conventional pinhole camera models with polynomial distortion approximation were analyzed and compared to the ray tracing model based on the vector form of Snell's law. We, first, conducted a series of experiments using an industrial videoendoscope and utilized the criteria based on the measurement error of a segment length to evaluate the mathematical models considered. The experimental results confirmed a theoretical conclusion that the ray tracing model outperforms the pinhole models in a wide range of working distances. The results may be useful for the development of new stereoscopic measurement tools and algorithms for remote visual inspection in industrial and medical applications.Keywords: remote visual inspection, 3D spatial measurements, camera calibration, distortion model, prism distortion.Citation: Gorevoy AV, Machikhin AS. Optimal calibration of a prism-based videoendoscopic system for precise 3D measurements.

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“…There are no limitations for the strain measurement. The paper [7] represents a Digital Image Correlation based on single camera pseudo-stereo system. This system uses a biprism in front of camera objective.…”

Section: Literature Reviewmentioning

confidence: 99%

Strain measurement using 3D stereo image correlation

Kumari

Banik

Premi

2015

2015 International Conference on Innovations in Information, Embedded and Communication Systems (ICIIECS)

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The demand of 3D image is growing sharply in the recent trends. Digital image processing performs image processing on digital images by the use of computer algorithms. Strain measurement is a big challenge for 3D images in the field of image processing. This paper proposed a noble algorithm for strain measurement of 3D stereo image using image processing for applications like non-invasive bio-sensing, non-contact measurements of space crafts, faults in pipeline industries, etc. Strain measurement is made possible with the help of filtration techniques and digital image correlation.

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Stereo-Digital Image Correlation (DIC) measurements with a single camera using a biprism

Cited by 99 publications

References 24 publications

A comparison of 2D and 3D digital image correlation for a membrane under inflation

A comparison of 2D and 3D digital image correlation for a membrane under inflation

Optimal calibration of a prism-based videoendoscopic system for precise 3D measurements

Strain measurement using 3D stereo image correlation

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