A digital image correlation-aided sampling moiré method for high-accurate in-plane displacement measurements

Chen, Changfu; Mao, Feng; Yu, Jiayong

doi:10.1016/j.measurement.2021.109699

Cited by 7 publications

(7 citation statements)

References 30 publications

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“…For geometric feature, some scholars have proposed deflection measurement method based on sampling Moiré pattern. 32,33 Gray feature has certain requirements on the gray information of the measured target surface. The most representative technology using gray feature is the digital image correlation (DIC) technology, which has the advantages of subpixel displacement positioning and high accuracy.…”

Section: Feature Detection and Matchingmentioning

confidence: 99%

“…Orientation code matching (OCM) calculates the orientation code of each pixel by matching gradient information, which is proved to have rotation invariance and brightness invariance. 33 Assuming that the gray value of each point in an image is represented by fðx; yÞ and its partial derivatives are f x ¼ ∂f∕∂x and f y ¼ ∂f∕∂y, then the gradient angle corresponding to the point with the pixel coordinate ðx; yÞ is θ x;y ¼ tan −1 ðf y ∕f x Þ and its corresponding orientation code is defined as follows:…”

Section: Orientation Code Matching Based On Gradient Featuresmentioning

confidence: 99%

“…With the help of high-speed cameras, dynamic displacement curves over time can be obtained by this method. Besides, using the DIC-aided SM method, 33 displacements exceeding half of the grating pitch can also be measured correctly. In addition to sampling Moiré method, the circular maker localization, corner diction, and cross detection can also be used.…”

Section: Feature Detection and Matching Based On Geometric Featurementioning

confidence: 99%

“…To reduce the impact of ambient light, high-brightness red LED lamps can also be installed on bridges, which can achieve deflection measurement with active illumination by installing a coupled bandpass optical filter in front of the lens. 33 The measurement resolution of this method is mainly limited by the measurement field of view and imaging resolution. For long-span bridges, multiple single-camera systems can also be used to achieve segmental measurement to ensure the measurement resolution.…”

Section: Two-dimensional Measurement With a Single Cameramentioning

confidence: 99%

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Measurement method and recent progress of vision-based deflection measurement of bridges: a technical review

et al. 2022

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The deflection that can reflect the vertical stiffness of a bridge plays an important role in the structural evaluation and health monitoring of bridges. In the past 20 years, the bridge deflection measurement methods based on computer vision and photogrammetry have been gradually applied to the field measurement due to the advantages of noncontact measurement, simple experimental setup, and easy installation. The technical research progress of vision-based bridge deflection measurement is reported from four aspects: basic principles, measurement methods, influencing factors, and applications. Basic principles mainly include camera calibration, three-dimensional (3D) stereo vision, photogrammetry, feature detection, and matching. For measurement methods, the single-camera two-dimensional measurement, the dual-camera 3D measurement, the quasistatic measurement based on photogrammetry, the multipoint dynamic measurement based on the displacement-relay videometrics and the deflection measurement based on UAV platform are introduced, respectively. In the section of influencing factors, this part summarizes the work of many researchers on the effects of camera imaging factors, calibration factors, algorithm factors, and environmental factors on measurement results. The field measurement results at different measurement distances and measurement accuracy based on these are presented in terms of applications. Finally, the future development trends of vision-based bridge deflection measurement are expected.

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Section: Feature Detection and Matchingmentioning

confidence: 99%

Section: Orientation Code Matching Based On Gradient Featuresmentioning

confidence: 99%

Section: Feature Detection and Matching Based On Geometric Featurementioning

confidence: 99%

Section: Two-dimensional Measurement With a Single Cameramentioning

confidence: 99%

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Measurement method and recent progress of vision-based deflection measurement of bridges: a technical review

et al. 2022

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“…Similarly, simulations were also performed to establish the accuracy of the method, concluding that cosinusoidal grating performed best while rectangular grating can perform just as well with camera defocusing [3,7]. Moreover, there have been experiments performed to confirm the effectiveness of the method through a three-point bending test conducted on a symmetrical rectangular steel beam for deflection measurement [2][3][4][16][17][18]. The results of the experiment display that the displacement values calculated by using the method comply with that of the displacement sensor and theory and ensure the accuracy of the method.…”

Section: Introductionmentioning

confidence: 99%

CCTV Camera Array for the Displacement and Strain Measurement of a Beam Specimen in a Laboratory

2022

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The available conventional sensors, like displacement transducers, used in the Structural Engineering Laboratory are expensive. In addition to that, the need for data acquisition devices also escalates the expense invested in point contact measurement systems. The recent appeal of vision-based measurement and the search for cost-effectiveness has led to an exploration of the established sampling moiré method using cheap closed-circuit television (CCTV) cameras as a viable option. The sampling moiré method is simple and analyzes the displacements from grating images by a phase-shifting method. Several trial experiments were conducted, which demonstrated that the setup is at least as accurate as the traditional measuring system. An experiment was conducted on a steel I-beam for displacement measurement, which displayed satisfactory results. In addition, the setup was also tested for strain measurement, and it has yielded promising results that need fine-tuning. This paper discusses the challenges, findings, and the possibility of incorporating vision-based displacement measurements in laboratory platforms.

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Improved SURF method in digital image correlation for estimation of large rotation angle

Liu

Yang

et al. 2023

Measurement

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A digital image correlation-aided sampling moiré method for high-accurate in-plane displacement measurements

Cited by 7 publications

References 30 publications

Measurement method and recent progress of vision-based deflection measurement of bridges: a technical review

Measurement method and recent progress of vision-based deflection measurement of bridges: a technical review

CCTV Camera Array for the Displacement and Strain Measurement of a Beam Specimen in a Laboratory

Improved SURF method in digital image correlation for estimation of large rotation angle

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