Measurement of local and volumetric deformation in geotechnical triaxial testing using 3D-digital image correlation and a subpixel edge detection algorithm

Wang, Pengpeng; Guo, Xutao; Sang, Yong; Shao, Longtan; Yin, Zenan; Wang, Yudi

doi:10.1007/s11440-020-00975-z

Cited by 24 publications

(8 citation statements)

References 37 publications

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“…Film investors and creators need to differentiate their audiences more finely and grasp the changes in audience mentality in a timely manner, according to different audiences and different schedules., different markets, different needs, and accurate positioning. Edge detection is a basic problem in early-stage vision theory and algorithms, and it is also one of the important factors of the success or failure of mid-and later-stage vision processing [3,4]. It has many applications in technology, military, medicine, and so on.…”

Section: Introductionmentioning

confidence: 99%

[Retracted] Optimal Method of Vision Sensor Digital Image Edge Detection for Commercial Investment in Film Field

Liu

2021

Journal of Sensors

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With the rapid development of the national economy, the film industry has risen rapidly under these conditions, and the development of film occupies a more important position in this process, which has led to the development of investment in the film field, an internationally recognized cultural space. This paper studies the commercial investment in the film field based on the edge detection of the digital image of the visual sensor. The purpose of the research is to point out the direction of commercial investment in the film industry by studying the effect of the edge detection of the digital image of the visual sensor on the application of the film object. The image edge detection algorithm based on wavelet transform and morphology and the application of these image edge detection algorithms such as wavelet theory analyze the shortcomings of movie, sound effects, and pictures and make a comparison before and after the improvement. Audiences, as the direct enjoyers of the cultural product of the film, their opinions, and evaluations of the film, largely determine the quality of the work. On the contrary, a good work can attract the public’s attention and bring a large impact. The data acquisition in this process is mainly based on the questionnaire survey of the audience. The experimental results show that before applying digital image edge detection to transform the clip, 7 people thought that the clip needed to be further improved to improve the quality of the film itself, and only 1 person affirmed the film; after the modification, 9 people proposed the film praise; in addition, 15 people audience watched the film processed by the edge detection method and gave high evaluations to the three aspects of sound effects, special effects, and editing, especially the editing part, with a score of 8.9.

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Section: Introductionmentioning

confidence: 99%

[Retracted] Optimal Method of Vision Sensor Digital Image Edge Detection for Commercial Investment in Film Field

Liu

2021

Journal of Sensors

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“…However, the 3D-DIC system involves multiple correlation runs, including cross-camera subset matching, and requires the input of calibration data. According to previous studies, the eventual benefit of avoiding errors due to deviations from planarity can also introduce other error sources in the obtained displacement and strain fields [28]. This fact justifies to some extent why the results obtained in the measurement of the planar components do not show significant differences between Aramis-3D and the 2D-DIC low-cost system.…”

Section: Resultsmentioning

confidence: 61%

“…However, it is also possible to estimate three-dimensional deformations using two calibrated parallax cameras (stereo-DIC or 3D-DIC), thus enabling measurement of out-of-plane displacements [26,27]. This approach requires two perfectly calibrated and synchronized cameras, which makes its application impractical most of the time unless commercial systems with specific binocular 3D systems are used [28]. Constructing a regular 3D-DIC system using two amateur cameras has some complexity, mainly because of the difficulty in accurately performing the internal and external orientations (which requires precise stereo calibration) and because of the synchronization of the cameras.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of a low-cost approach to 2-D digital image correlation vs. a commercial stereo-DIC system in Brazilian testing of soil specimens

Arza-García

Núñez-Temes

Lorenzana

et al. 2021

Archiv.Civ.Mech.Eng

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Due to their cost, high-end commercial 3D-DIC (digital image correlation) systems are still inaccessible for many laboratories or small factories interested in lab testing materials. These professional systems can provide reliable and rapid full-field measurements that are essential in some laboratory tests with high-strain rate events or high dynamic loading. However, in many stress-controlled experiments, such as the Brazilian tensile strength (BTS) test of compacted soils, samples are usually large and fail within a timeframe of several minutes. In those cases, alternative low-cost methods could be successfully used instead of commercial systems. This paper proposes a methodology to apply 2D-DIC techniques using consumer-grade cameras and the open-source image processing software DICe (Sandia National Lab) for monitoring the standardized BTS test. Unlike most previous studies that theoretically estimate systematic errors or use local measures from strain gauges for accuracy assessment, we propose a contrast methodology with independent full-field measures. The displacement fields obtained with the low-cost system are benchmarked with the professional stereo-DIC system Aramis-3D (GOM GmbH) in four BTS experiments using compacted soil specimens. Both approaches proved to be valid tools for obtaining full-field measurements and showing the sequence of crack initiation, propagation and termination in the BTS, constituting reliable alternatives to traditional strain gauges. Mean deviations obtained between the low-cost 2D-DIC approach and Aramis-3D in measuring in-plane components were 0.08 mm in the perpendicular direction of loading (ΔX) and 0.06 mm in the loading direction (ΔY). The proposed low-cost approach implies considerable savings compared to commercial systems.

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“…It can be seen from the figure that the shear strain of the soil far away from the root tip is small and uniform and the soil particles and aggregates that are passed through or bypassed by the root tip near the root tip produce relatively large shear strain. The DIC measurements provide full-field displacement and strain measurement for soil particles and aggregates, allowing for the visualization and analysis of strain field variations that occur due to the soil-root interaction (Wang et al, 2020). 2D-DIC is an effective measurement tool for planar soil particles and aggregates that do not exhibit out-of-plane displacement or strain.…”

Section: Soil Particle Strainmentioning

confidence: 99%

2D Kinematic Quantification of Soil Particles around Growing Plant Root based on Optical Mechanics

Zhao

2020

American Journal of Biochemistry and Biotechnology

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The quantitative kinematic description of the surrounding soil particles during root growth is a technical challenge and biologically important. In this study, a two-dimensional camera-based imaging system was used to observe micro scale interactions between plant roots and soil particles. Maize root tip was imaged during ingress into the soils. This produced a series of twodimensional images that represent temporal resolution of the geometric soil and root configurations at the micrometer scale. These images were used as inputs for full-field kinematic quantification methods, which enabled the analysis of two-dimensional deformation of the soils around elongating root. Correlationbased discrete object tracking and contour updating were used to track the shapes and the locations of soil particles and soil aggregates, while incremental digital image correlation was proposed to extract deformation and strain field within soil particle and soil aggregate. These techniques allowed the full-field displacements and strains of the soil to be quantified and the changes in shapes of soil particles to be visualized. Experimental results show that the presented shape tracking scheme, incremental digital image correlation and the research findings will be useful for the measurement and quantification of soil particle kinematics of soil-root physical interactions.

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Measurement of local and volumetric deformation in geotechnical triaxial testing using 3D-digital image correlation and a subpixel edge detection algorithm

Cited by 24 publications

References 37 publications

[Retracted] Optimal Method of Vision Sensor Digital Image Edge Detection for Commercial Investment in Film Field

[Retracted] Optimal Method of Vision Sensor Digital Image Edge Detection for Commercial Investment in Film Field

Evaluation of a low-cost approach to 2-D digital image correlation vs. a commercial stereo-DIC system in Brazilian testing of soil specimens

2D Kinematic Quantification of Soil Particles around Growing Plant Root based on Optical Mechanics

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