Camera System Resolution and its Influence on Digital Image Correlation

Reu, Phillip L.; Sweatt, William C.; Miller, Timothy J.; Fleming, Darryn D.

doi:10.1007/s11340-014-9886-y

Cited by 72 publications

(34 citation statements)

References 15 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In such cases, a natural solution could be to use the camera to zoom into the region around the defect or perhaps to move the camera closer to the tapestry. Part of this investigation explores the merits and effectiveness of such a strategy; in particular, we examine how the loss of information associated with the zoomed tapestry image affects the uncertainty in the measured strain field …”

Section: Methodsmentioning

confidence: 99%

Evaluating the use of digital image correlation for strain measurement in historic tapestries using representative deformation fields

Alsayednoor

Harrison

Dobbie

et al. 2019

Strain

View full text Add to dashboard Cite

An analysis technique to assess the viability of digital image correlation (DIC) in tracking the full‐field strains across the surface of hanging historic tapestries is presented. Measurement uncertainty related to the use of the inherent tapestry image in tracking displacements is investigated through use of “synthetic” deformation fields. The latter are generated by mapping the details of a given tapestry image into finite element analyses. The combination of self‐weight loading, material non‐linearity, and image specific heterogeneity (related to slit stitching, damage, and patch‐restorations) serve to generate a bespoke deformation field complex enough to assess the reliability of DIC measurements. Accuracy is evaluated by comparing measured results with the original known deformations. The technique demonstrates that the optimum imaging settings and the choice of subset size for DIC analysis are strongly influenced by the tapestry image and the goal of the measurement, they are found using a compromise between conflicting objectives: minimising measurement error while maximising resolution.

show abstract

Section: Methodsmentioning

confidence: 99%

Evaluating the use of digital image correlation for strain measurement in historic tapestries using representative deformation fields

Alsayednoor

Harrison

Dobbie

et al. 2019

Strain

View full text Add to dashboard Cite

show abstract

“…The spatial resolution was determined on endoscopic images of a USAF standard (USAF 1951, Thorlabs GmbH, Dachau, Germany) taken at distances of 3, 5, and 10 mm between the distal end of the endoscope and the target. Subsequent the smallest resolvable group and element number of the USAF-standard was identified and thereby the maximal resolvable lines per mm calculated 18,19 . To get information about the reproducibility of single-use ureteroscopes ten different devices were tested plus two reusable endoscopes.…”

Section: Spatial Resolutionmentioning

confidence: 99%

Comparative investigation of reusable and single–use flexible endoscopes for urological interventions

Eisel

Strittmatter

Ströbl

et al. 2020

Sci Rep

View full text Add to dashboard Cite

In order to evaluate the technical adaptability of a type of disposable endoscope compared to reusable flexible endoscopes, in vitro and in vivo studies were conducted. A disposable digital ureteroscope ("chip on tip") and two reusable endoscopes were investigated with respect to spatial resolution, geometric distortion in air and water the maximum. Additionally, the clinical performance of the disposable device was tested during clinical procedures (n = 20). The disposable endoscope showed an optical resolution of 6.72 lines/mm at 10 mm distance, similar to the other devices. In comparison, the disposable endoscope showed a barrel-shaped image distortion in air of −24.2%, which is in the middle range, but was best under water (−8.6%). The bendability of 297° (275 µm fiber) and 316° (empty channel, 1.5 F basket) and the maximum irrigation (1 m: 58.1 ml/min, 2 m: 91.9 ml/min) were convincing. Clinically the maneuverability was very good in (13/20), good or satisfactory in (7/20). Visibility was evaluated as very good in (11/20), just in (1/20) either satisfactory or sufficient. The consistency of visibility was not affected in (19/20). In all cases there were no adverse events. The technical examination and clinical application of the disposable endoscope are of equal quality compared to reusable devices. Disposable endoscopes can be an alternative to reusable devices, but economic aspects such as reduction of repair costs, sterilization effort and additional waste must be taken into account.

show abstract

“…The DIC method is inherently subjective. Numerous parameters affect the quality of DIC results, such as the lighting, the camera exposure (Zhu et al, 2018), the focal length (Reu et al, 2015), the surface pattern (Lecompte et al, 2006;Sutton et al, 2009;Reu et al, 2015), as well as the accuracy of the calibration.…”

Section: Digital Image Correlation (Dic)mentioning

confidence: 99%

Dome-Shape Auxetic Cellular Metamaterials: Manufacturing, Modeling, and Testing

et al. 2019

View full text Add to dashboard Cite

We present in this work the manufacturing, modeling, and testing of dome-shaped cellular structures with auxetic (negative Poisson's ratio) behavior. The auxetic configurations allow the creation of structures with synclastic (i.e., dome-shaped) curvatures, and this feature is used to evaluate the performance of cellular metamaterials under quasi-static indentation conditions. We consider here different cellular geometries (re-entrant, arrow-head, tri-chiral, hexagonal) and the implications of their manufacturing using 3D printing techniques with PLA material. The dome-shaped configurations are modeled using full-scale non-linear quasi-static and explicit dynamic FE models that represent both the geometry and approximate constitutive models of the PLA filament material derived from tensile tests on dogbone specimens. The cellular metamaterials samples are subjected to indentation tests, with maps of strains obtained through DIC measurements. The correlation between experimental and numerical simulations is good, and shows the peculiar indentation behavior of these cellular structures. We also perform a comparative analysis by simulation of the force/displacement, strain and fracture history during quasi-static loading, and discuss the performance of the different cellular topologies for these dome-shape metamaterial designs.

show abstract

Camera System Resolution and its Influence on Digital Image Correlation

Cited by 72 publications

References 15 publications

Evaluating the use of digital image correlation for strain measurement in historic tapestries using representative deformation fields

Evaluating the use of digital image correlation for strain measurement in historic tapestries using representative deformation fields

Comparative investigation of reusable and single–use flexible endoscopes for urological interventions

Dome-Shape Auxetic Cellular Metamaterials: Manufacturing, Modeling, and Testing

Contact Info

Product

Resources

About