3D digital image correlation using single color camera pseudo-stereo system

Li, Junrui; Dan, Xizuo; Xu, Weitao; Wang, Yonghong; Yang, Guobiao; Yang, Lianxiang

doi:10.1016/j.optlastec.2017.03.030

Cited by 61 publications

(21 citation statements)

References 12 publications

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“…In all of the aforementioned approaches the research interest is focused on the effect of demosaicking on the correlation coefficient factor distribution and on the resultant displacement error. It has been proven through extensive studies that the demosaicking algorithms are directly influencing DIC [ 11 , 12 , 17 , 22 ].…”

Section: Colour Dic and Data Processingmentioning

confidence: 99%

Metrological Evaluation of the Demosaicking Effect on Colour Digital Image Correlation with Application in Monitoring of Paintings

Παπανικολάου

Garbat

Kujawińska

2022

Sensors

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A modified 3D colour digital image correlation method (3D cDIC) is proposed for efficient displacement measurements of colour objects with natural texture. The method is using a separate analysis of correlation coefficient (sigma) value in the RGB channels of CCD cameras by utilising local information from the channel with the minimum sigma. In this way, merged U, V and W displacement maps are generated based on the local correlation quality. As the proposed method applies to colour filter array cameras, the images in RGB channels have to undergo a demosaicking procedure which directly influences the accuracy of displacement measurements. In the paper, the best performing demosaicking methods are selected. The metrological analysis of their influence on the results of canvas paintings investigations obtained by unmodified and modified 3D cDIC processing is presented.

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Section: Colour Dic and Data Processingmentioning

confidence: 99%

Metrological Evaluation of the Demosaicking Effect on Colour Digital Image Correlation with Application in Monitoring of Paintings

Παπανικολάου

Garbat

Kujawińska

2022

Sensors

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“…Xia et al developed a diffraction-assisted image correlation for 3D displacement measurement using a single camera and 2D-DIC algorithm [ 8 , 9 ]. The color separation-based single-camera 3D-DIC using the 3CCD color camera or an industrial color CCD camera has also been developed [ 10 , 11 ]. In these single-camera 3D-DIC techniques, left and right-view images of the sample can be obtained directly with a single camera.…”

Section: Introductionmentioning

confidence: 99%

Single-Camera Three-Dimensional Digital Image Correlation with Enhanced Accuracy Based on Four-View Imaging

Shao

Chen

2023

Materials

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Owing to the advantages of cost-effectiveness, compactness, and the avoidance of complicated camera synchronization, single-camera three-dimensional (3D) digital image correlation (DIC) techniques have gained increasing attention for deformation measurement of materials and structures. In the traditional single-camera 3D-DIC system, the left and right view images can be recorded by a single camera using diffraction grating, a bi-prism, or a set of planar mirrors. To further improve the measurement accuracy of single-camera 3D-DIC, this paper introduces a single-camera four-view imaging technique by installing a pyramidal prism in front of the camera. The 3D reconstruction of the measured points before and after deformation is realized with eight governing equations induced by four views, and the strong geometric constraints of four views can help to improve the measurement accuracy. A static experiment, a rigid body translation experiment, and a four-point bending experiment show that the proposed single-camera 3D-DIC method can achieve higher measurement accuracy than the dual-view single-camera 3D-DIC techniques and that the single-camera 3D-DIC method has advantages in reducing both random error and systematic error.

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“…Digital Image Correlation (DIC), a non-contact measurement method, has achieved great success in the field of optical measurement and is still developing rapidly [13][14][15][16][17]. A first attempt to experimentally measure R-value using DIC was reported by Xie in 2017 [18].…”

Section: Introductionmentioning

confidence: 99%

A New and Direct R-Value Measurement Method of Sheet Metal Based on Multi-Camera DIC System

Fang

Zheng

et al. 2021

Metals

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More and more attention has been given in the field of mechanical engineering to a material’s R-value, a parameter that characterizes the ability of sheet metal to resist thickness strain. Conventional methods used to determine R-value are based on experiments and an assumption of constant volume. Because the thickness strain cannot be directly measured, the R-value is currently determined using experimentally measured strains in the width, and loading directions in combination with the constant volume assumption, to determine the thickness strain indirectly. This paper provides an alternative method for determining the R-value without any assumptions. This method is based on the use of a multi-camera DIC system to measure strains in three directions simultaneously. Two sets of stereo-vision DIC measurement systems, each comprised of two GigE cameras, are placed on the front and back sides of the sample. Use of the double-sided calibration strategy unifies the world coordinate system of the front and back DIC measurement systems to one coordinate system, allowing for the measurement of thickness strain and direct calculation of R-value. The Random Sample Consensus (RANSAC) algorithm is used to eliminate noise in the thickness strain data, resulting in a more accurate R-value measurement.

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3D digital image correlation using single color camera pseudo-stereo system

Cited by 61 publications

References 12 publications

Metrological Evaluation of the Demosaicking Effect on Colour Digital Image Correlation with Application in Monitoring of Paintings

Metrological Evaluation of the Demosaicking Effect on Colour Digital Image Correlation with Application in Monitoring of Paintings

Single-Camera Three-Dimensional Digital Image Correlation with Enhanced Accuracy Based on Four-View Imaging

A New and Direct R-Value Measurement Method of Sheet Metal Based on Multi-Camera DIC System

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