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Rozprawy doktorskie na temat „Digital image correlation”

Autor: Grafiati

Data publikacji: 4 czerwca 2021

Data aktualizacji: 25 lipca 2025

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1

Mosayebi, Mahshad. "Digital Laser Speckle Image Correlation." OpenSIUC, 2017. https://opensiuc.lib.siu.edu/theses/2131.

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This thesis examines the feasibility of combining Digital Image Correlation (DIC) with laser speckle based methods to form a new hybrid deformation measurement method called Digital Laser Speckle Image Correlation (DilSIC). Consequently, this method does not require any sample preparation and allows for the measurement of displacement of micro structures in addition to large displacements. In this technique, a coherent 30mW-632nm laser beam is expanded with 40X lens and then illuminated on the target surface to produce a fine, homogenous laser speckle pattern. Images were captured before and a

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Hartley, David Andrew. "Image correlation using digital signal processors." Thesis, Liverpool John Moores University, 1991. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.304465.

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Newberry, Shawn. "Laser Speckle Patterns with Digital Image Correlation." OpenSIUC, 2021. https://opensiuc.lib.siu.edu/theses/2885.

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Digital Laser Speckle Image Correlation (DiLSIC) is a technique that utilizes a laser generated speckle pattern with Digital Image Correlation (DIC). This technology eliminates the need to apply an artifact speckle pattern to the surface of the material of interest, and produces a finer speckle pattern resulting in a more sensitive analysis. This investigation explores the parameters effecting laser speckle patterns for DIC and studies DiLSIC as a tool to measure surface strain and detect subsurface defects on pressure vessels. In this study a 632.8 nm 30 mW neon-helium laser generated the spe

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Liang, Yiming. "Analysis of Paperboard Performance using Digital Image Correlation." Thesis, KTH, Hållfasthetslära, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-277799.

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The performance of paperboard materials in packaging application has been investigated and evaluated for a long time. This is because it plays a decisive role for product protection and decoration in packaging applications. Potential damages during transportation sometimes affect the consistency of the performance. Therefore, the capability of the material to resist these external disturbances was of interest. A multiply paperboard was chosen as the experimental material. The analysis conducted in this thesis aimed to reveal the tensile behavior in the cross-machine direction (CD) of the mater

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Nageswaran, Ashok R. "Deformation Analysis of Soft Tissues by Digital Image Correlation." University of Cincinnati / OhioLINK, 2009. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1233614556.

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Shrestha, Shashi Shekhar. "Evaluation of Composite Adhesive Bonds Using Digital Image Correlation." OpenSIUC, 2015. https://opensiuc.lib.siu.edu/theses/1648.

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Advanced composite materials are widely used for many structural applications in the aerospace/aircraft industries today. Joining of composite structures using adhesive bonding offers several advantages over traditional fastening methods. However, this technique is not yet employed for fastening the primary structures of aircrafts or space vehicles. There are several reasons for this: There are not any reliable non-destructive evaluation (NDE) methods that can quantify the strength of the bonds, and there are no certifications of quality assurance for inspecting the bond quality. Therefore, th

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Karimian, Seyed Fouad. "Evaluation of Adhesive Joints with Ultrasonic Digital Image Correlation." OpenSIUC, 2016. https://opensiuc.lib.siu.edu/theses/2054.

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Increasing use of composite materials in industry brings the need for newer and more practical methods to evaluate them. Widespread use of composite materials heavily depends on the manufacturer’s ability to unquestionably ensure its safety, given how much the user trusts them. Non-Destructive Evaluation (NDE) can be used to evaluate adhesive bondline health. This thesis employs Digital Image Correlation (DIC) method, one of the known methods in NDE, and combines it with an embedded speckle pattern in order to obtain valuable information from within the adhesive bondline. By recording the move

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Sapounas, D. "A novel approach to rotation invariant correlation." Thesis, Cranfield University, 1994. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.283306.

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Gubbels, Wade. "3-D Digital Image Correlation using a single color-camera." Thesis, University of British Columbia, 2014. http://hdl.handle.net/2429/50491.

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Digital Image Correlation (DIC) is an optical and numerical method capable of accurately providing full-field, two-dimensional (2-D) and three-dimensional (3-D) surface displacements and strains. 3-D DIC is typically done using two cameras that view the measured object from differing oblique directions. The measured images are independent and must be spatially connected using a detailed calibration procedure. This places a large demand on the practitioner, the optical equipment and the computational method. A novel approach is presented here where a single color-camera is used in place of m

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Adapa, Sujatha. "Evaluation of friction stir weld samples using digital image correlation /." Available to subscribers only, 2006. http://proquest.umi.com/pqdweb?did=1136092291&sid=5&Fmt=2&clientId=1509&RQT=309&VName=PQD.

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Thesis (M.S.)--Southern Illinois University Carbondale, 2006.<br>"Department of Mechanical Engineering and Energy Processes." Includes bibliographical references (leaves 70-74). Also available online.

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Bingleman, Luke. "Enhancing the robustness of ESPI measurements using digital image correlation." Thesis, University of British Columbia, 2010. http://hdl.handle.net/2429/27540.

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Electronic Speckle Pattern Interferometry (ESPI) provides a sensitive technique for measuring surface deformations. The technique involves comparison of the speckle phase angles within surface images measured before and after material deformation. This phase angle comparison requires that the speckle positions be consistent in all images. A lateral shift between images by just one pixel substantially degrades ESPI measurements, while a shift of two or more pixels typically causes complete speckle decorrelation and compromises the measurement entirely. To prevent such lateral motions, the speci

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LYLES, ALBERT Anthony. "AN ADVANCED APPROACH VERIFICATION TO DIGITAL LASER SPECKLE IMAGE CORRELATION." OpenSIUC, 2018. https://opensiuc.lib.siu.edu/theses/2458.

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This research project on the campus of Southern Illinois University Carbondale is an extension to the inquiry into the feasibility and reliability of the technology known as Digital Laser Speckle Image Correlation (DiLSIC). This is a hybrid approach of combining two existing technologies. The first being Digital Image Correlation (DIC) which is a nondestructive evaluation commonly used to find displacement, in-plane strain, as well as deformation. The second being the of laser speckle patterns. This hybrid has achieved level of resolution measured to be 3.4μ. DiLSIC increases the application a

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Webster, Kelly Eileen. "Quantifying Renal Swelling during Machine Perfusion using Digital Image Correlation." Thesis, Virginia Tech, 2017. http://hdl.handle.net/10919/78244.

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While machine perfusion of explanted kidneys is theoretically superior to standard cold storage, it may damage potential transplants unless machine-associated swelling is controlled. This thesis presents the effects of perfusate tonicity on renal swelling during hypothermic machine perfusion. Phosphate buffered solution (PBS) and PBS supplemented with 5% w/v mannitol were used as isotonic (289 mOsm/kg) and hypertonic (568 mOsm/kg) perfusates, respectively. Porcine kidney pairs were procured then flushed and machine perfused; the right and left kidneys were assigned opposite perfusates. An e

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Kunchum, Shilpa. "Embedded Digital Image Correlation in a Full-Field Displacement Sensor." University of Akron / OhioLINK, 2012. http://rave.ohiolink.edu/etdc/view?acc_num=akron1346171486.

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Curt, Jordan. "Damage detection for wind turbine towers with Digital Image Correlation." Thesis, université Paris-Saclay, 2021. http://www.theses.fr/2021UPAST008.

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La technologie des éoliennes est mature et le marché est avec le temps devenu compétitif. Un levier pour diminuer les coûts de l’exploitation des éoliennes réside dans l’optimisation de la maintenance des turbines. Dans ce contexte, cette étude se focalise sur l’état de la tour de l’éolienne. La durée de vie de la tour est influencée par des paramètres incertains liés à l’environnement et les aléas matériaux. Ceci rend très difficile la prédiction de la durée de vie d’un mât et des marges importantes sont prises lors de son dimensionnement. Cependant des éoliennes se sont déjà effondrées dans

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Deshmukh, Prutha. "Damage Detection Of a Cantilever Beam Using Digital Image Correlation." University of Cincinnati / OhioLINK, 2021. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1623169831665585.

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Vullaganti, Anoop. "Mechanical Parameter Characterization of Thin Polymer Films Using Digital Image Correlation." Thesis, Blekinge Tekniska Högskola, Institutionen för maskinteknik, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:bth-21653.

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Mechanical parameter characterization of very thin polymer films using digital im- age correlation is performed in this work. At present days DIC is widely used in the construction, food industries, and aviation. Despite advantages when compared to other conventional methods, but users still face difficulties with the analysis of thin polymers like low-density polyethylene (LDPE) and polyethylene terephthalate (PET) thin polymer films. For the application of sprays to obtain the best pattern quality as well as the potential of thin-film material properties tempering from the stochastic pattern

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18

Eckstein, Adric. "Development of Robust Correlation Algorithms for Image Velocimetry using Advanced Filtering." Thesis, Virginia Tech, 2007. http://hdl.handle.net/10919/36338.

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Digital Particle Image Velocimetry (DPIV) is a planar measurement technique to measure the velocity within a fluid by correlating the motion of flow tracers over a sequence of images recorded with a camera-laser system. Sophisticated digital processing algorithms are required to provide a high enough accuracy for quantitative DPIV results. This study explores the potential of a variety of cross-correlation filters to improve the accuracy and robustness of the DPIV estimation. These techniques incorporate the use of the Phase Transform (PHAT) Generalized Cross Correlation (GCC) filter applied t

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Salvati, Peter. "The Examination of Fracture Behavior in Anisotropic Rock with Digital Image Correlation." Thesis, University of Louisiana at Lafayette, 2017. http://pqdtopen.proquest.com/#viewpdf?dispub=10287221.

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<p>Modern hydraulic fracturing designs assume that drilled formations are both isotropic and homogeneous, and fractures are linear and symmetrical. However, unconventional resources are often obtained from formations that are both anisotropic and heterogeneous, resulting in complex fracture behavior. The objective of this study is to evaluate fracture behavior based on the influence of anisotropy and water saturation. Isotropic and homogeneous Austin Chalk, Berea Sister Gray Sandstone, and Silurian Dolomite, laminated anisotropic and heterogeneous Parker Sandstone, Nugget Sandstone, and Winter

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Mekky, Waleed Nicholson P. S. "Fracture toughness of the nickel-alumina laminates by digital image-correlation technique." *McMaster only, 2005.

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Ajmal, Osman Z. "The use of digital image correlation to monitor delaminations in composite structures." Thesis, University of Surrey, 2018. http://epubs.surrey.ac.uk/849052/.

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The range of applications for composite materials is growing, but understanding of the effect of defects is limited, as is the ability to detect them. Versatile non-destructive testing (NDT) techniques, that can be deployed rapidly and reliably, to detect and monitor damage in composite components are vital to the continued growth of this sector. This research investigates the application of Digital Image Correlation (DIC) as an NDT technique for monitoring delamination defects in Fibre Reinforced Polymer (FRP) composites. The research has matched physical experiments with Finite Element (FE)

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Buck, Nicole V. "Implementation of an Open-Source Digital Image Correlation Software for Structural Testing." DigitalCommons@CalPoly, 2020. https://digitalcommons.calpoly.edu/theses/2215.

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This thesis investigates the appropriateness of a simplified, open-source digital image correlation (DIC) software for use in quasi-static, structural testing utilizing two-dimensional (2D) DIC measurements. DIC is a non-contact optical measurement technique that uses computer vision to track unique attributes on the surface of an object. For structural testing, traditional instrumentation such as displacement sensors and strain gages are impractical for full field measurements due their limited ability to capture large amounts of data. However, over the past decade, DIC has proven a successfu

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Jiang, Yanxia. "MEASUREMENT OF J-INTEGRAL VALUES OF DENTAL CERAMICS BY DIGITAL IMAGE CORRELATION." Case Western Reserve University School of Graduate Studies / OhioLINK, 2016. http://rave.ohiolink.edu/etdc/view?acc_num=case1453880114.

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Wang, Dezhi. "Kriging regression in digital image correlation for error reduction and uncertainty quantification." Thesis, University of Liverpool, 2015. http://livrepository.liverpool.ac.uk/2029379/.

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Digital Image Correlation (DIC) is a widely used full-field measurement technique in the field of experimental mechanics because of its simplicity and ease of implementation. However, owing to the inherent complexity of DIC error sources, the problem of DIC error reduction and uncertainty quantification is still unsolved and has received considerable attention in recent years. The existing work on DIC error reduction is usually focused on specific error sources, e.g. local smoothing techniques are normally applied to reduce errors due to image acquisition noise. Moreover, DIC uncertainty quant

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Lim, WeiChiang Eric. "EMBEDDED SPECKLE BONDLINE DEFECT DETECTION USING ULTRASONIC DIGITAL IMAGE CORRELATION (UT-DIC)." OpenSIUC, 2018. https://opensiuc.lib.siu.edu/theses/2391.

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The primary objective of this research is to conduct further evaluation of ultrasonic digital image correlation (UT-DIC) on strain map analysis and defect detection of adhesive joints with embedded speckle pattern. UT-DIC is a non-destructive evaluation method that utilized ultrasonic C-scan images for whole field strain and displacement analysis. Acrylic glass, epoxy resin system and metal shavings with high acoustic impedance of a specific weight were used to create the samples which were loaded under tension. Defects with varying shapes and sizes were implemented by surface preparation to u

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Mamand, Heman. "The assessment of deteriorated concrete structures using extended digital image correlation (EDIC)." Thesis, University of Portsmouth, 2015. https://researchportal.port.ac.uk/portal/en/theses/the-assessment-of-deteriorated-concrete-structures-using-extended-digital-image-correlation-edic(91a6f1a9-6c0b-4b5c-8715-8edb4194ccac).html.

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Concrete structures in marine environments frequently experience long-term deterioration due to environmental exposure. This exposure results in surface damage with the subsequent spalling of concrete, which has a significant effect on the long-term durability of the structure. The reinforced concrete jetty investigated in this study suffered similar problems. The concrete jetty is located on the South East England coast. The jetty consists of a deck that is part precast and part in-situ cast, which is supported by steel, concrete and a sheet pile wall. Five decades after its construction, ero

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Thai, Thinh Quang. "Importance of Exposure Time on Digital Image Correlation (DIC) at Extreme Temperatures." DigitalCommons@USU, 2018. https://digitalcommons.usu.edu/etd/7067.

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Extreme temperatures have increasingly played an important role in engineering applications, including leading edges during hypersonic flight, spacecraft re-entry, and propulsion systems. In order to design for such thermo-mechanical conditions, materials must be characterized using suitable measurement methods. DIC is a popular and versatile method in full-field measurement. In brief, DIC compares images of a sample between its undeformed and deformed state in order to get displacement and strain field maps. Since the images are acquired from digital cameras, it is important to have high cont

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Barhli, Selim Matthias. "Advanced quantitative analysis of crack fields, observed by 2D and 3D image correlation, volume correlation and diffraction mapping." Thesis, University of Oxford, 2017. https://ora.ox.ac.uk/objects/uuid:d6240241-8a1e-4a8e-aff0-4a2ef14b0da7.

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This thesis is concerned with the evaluation, in-situ, of the elastic strain energy release rate of cracks. This can define the criteria for crack propagation, and it is usually necessary to obtain this via calculation from the geometry and applied load. A new method is proposed, based on the conjoint use of digital image correlation to measure full-field displacements and finite element to extract the strain energy release rate of surface cracks. It has been extended to 3-D datasets with the use of digital volume correlation and tomographic imaging. A finite element model with imported full-f

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Lan, Yusha. "Macroscale Analysis of Strain Path Change Effects in AA3104 by Digital Image Correlation." Thesis, Université d'Ottawa / University of Ottawa, 2014. http://hdl.handle.net/10393/31350.

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Cold rolled aluminum is a widely used metal in industry. The forming limit diagram (FLD) which is commonly used to predict safe deformation parameters currently fails to predict the uniform elongation after non-proportional strain path often found in industrial operations. In this work, a non-proportional strain path change in aluminum alloy 3104 going from plane strain tension to uniaxial tension was investigated. Plane strain tensile tests have been carried out to various pre-strains (3%, 6% and 9%), followed by uniaxial tensile tests at various orientation with respect to the tensile direct

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Gustafson, Hannah Marie. "Quantifying the response of vertebral bodies to compressive loading using digital image correlation." Thesis, University of British Columbia, 2016. http://hdl.handle.net/2429/59416.

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Understanding vertebral mechanics is of interest for identifying persons at risk of fracture, whether that is due to everyday loading such as in osteoporotic fracture or as a result of dynamic loading leading to a traumatic fracture. Vertebral fractures negatively impact the quality life of patients and represent a large financial burden on the healthcare system. A powerful but underutilized tool that can be used to study vertebral loading and fracture is digital image correlation (DIC). DIC is a non-contact optical method for measuring the displacement on the surface of materials, including b

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Gadepalli, Prasanna Chaitanya. "USING THREE-DIMENSIONAL DIGITAL IMAGE CORRELATION TO FIND STRAINS IN STRUCTURAL POLYMER FOAM." University of Akron / OhioLINK, 2020. http://rave.ohiolink.edu/etdc/view?acc_num=akron1595947881930553.

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Shrestha, Sulochana Shrestha. "STUDY OF FATIGUE CRACK PROPAGATION ON METALS USING ACOUSTIC EMISSION AND ELECTRIC RESISTIVITY IN CORRELATION WITH DIGITAL IMAGE CORRELATION." University of Akron / OhioLINK, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=akron1525705916102737.

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Aswad, Mohsin Abbas. "Residual stress and fracture in high temperature ceramics." Thesis, University of Manchester, 2012. https://www.research.manchester.ac.uk/portal/en/theses/residual-stress-and-fracture-in-high-temperature-ceramics(2d617cd5-ac5c-4927-8b87-cae0fdcee6da).html.

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Recrystallised alumina is used as a high performance crucible material. Its thermal shock resistance is known to be affected by component shape, and also by processing variables, since the defects and internal stress at both the microscale (i.e. between grains due to anisotropic crystal properties) and macroscale (i.e. due to differential shrinkage during sintering) influence the fracture strength. The aim of this thesis is to study the nucleation and growth of defects in pure alumina and Cr-doped alumina, and to investigate how their behavior is affected by residual stresses, such those intro

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Keller, Jürgen. "Micro- and nanoscale characterization of polymeric materials by means of digital image correlation techniques." kostenfrei, 2005. http://deposit.ddb.de/cgi-bin/dokserv?idn=975021079.

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Khennouf, Djallal. "Assessing the feasibility of using digital image correlation to monitor deformation in historical tapestries." Thesis, University of Southampton, 2011. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.538985.

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Liutkus, Timothy James. "Digital Image Correlation in Dynamic Punch Testing and Plastic Deformation Behavior of Inconel 718." The Ohio State University, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=osu1397751677.

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Lee, Dong Gun. "Strain measurement of flip-chip solder bumps using digital image correlation with optical microscopy." Diss., Online access via UMI:, 2009.

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Thesis (M.S.)--State University of New York at Binghamton, Thomas J. Watson School of Engineering and Applied Science, Department of Mechanical Engineering, 2009.<br>Includes bibliographical references.

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Ferreira, Catarina Duarte Barros. "Digital Image Correlation for Vibration Analysis." Master's thesis, 2021. https://hdl.handle.net/10216/136673.

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Hung, Po-Chih. "Strain analysis by digital image correlation /." Diss., 1998. http://gateway.proquest.com/openurl?url_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:dissertation&res_dat=xri:pqdiss&rft_dat=xri:pqdiss:9914246.

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Ceng, Shun-Long, and 曾舜隆. "Digital image correlation for large deformation measurement." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/13662027928882515729.

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碩士<br>國立中興大學<br>機械工程學系所<br>102<br>The present study has developed a plane displacement measurement system based on a digital image correlation method. For these purposes,the strain of large deformation was defined as 40%. A series of analyses was performed on the images before and after deformation, including correlational analysis, connected component labeling, and shape interpolation function analysis. Furthermore, optimizations were made employing displacement equations and brightness of transformation models, in conjunction with Newton’s method. Iterative methods were used to find the unde

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Chen, Yu-Hsiang, and 陳鈺翔. "Strain Measurement Using Digital Image Correlation Method." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/10901417533429290795.

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碩士<br>國立中興大學<br>機械工程學系所<br>99<br>Digital image correlation method is a non-contact, non-destructive optical measuring method, the principle is the second image by comparing each pixel with the first image (reference image) in the fixed point of reference pixel correlation to find images from the second image with the first reference pixel has a maximum correlation of the pixels, the point that this reference in the second pixel of the image of the corresponding points in the statistics there are several kinds of method used to calculate the correlation coefficient, used in digital image correl

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Jiang, Jei-Wei, and 江偉傑. "Digital Image Correlation Applied in Strain Measurement." Thesis, 2004. http://ndltd.ncl.edu.tw/handle/85723835291767600728.

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碩士<br>國立雲林科技大學<br>機械工程系碩士班<br>92<br>This text presents a new numerical conception of digital image correlation to measure full-field strain in planar specimen which is suffering external force. This new method can afford strain information on entire field of specimen surface by processing two digital images which were respectively caught from the unforced and forced specimen. The new numerical procedures here aim at making this method a widely applicatory strain measuring method. It means that ideally this method can be applied in various conditions. Two numerical iterative methods are used to

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Botha, Theunis R. "Digital Image Correlation : applications in Vehicle Dynamics." Thesis, 2015. http://hdl.handle.net/2263/45956.

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Except for aerodynamics forces, all vehicle excitation forces are generated at the tyre-road interface. Considering low speed applications, such as terramechanics where the aerodynamics force are negligible, the road-tyre interaction is of extreme importance. Crucial variables which govern the forces generated at the tyre-road interface are tyre side-slip angle, tyre longitudinal slip ratio and terrain pro le. Solutions to measure these variables exist for smooth hard roads but the solutions experience challenges on rough and o -road terrain. Digital Image Correlation is concerned with t

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Yang, Jin. "Fast Adaptive Augmented Lagrangian Digital Image Correlation." Thesis, 2019. https://thesis.library.caltech.edu/11233/1/Yang_Jin_2019.pdf.

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<p>Digital image correlation (DIC) is a powerful experimental technique for measuring full-field displacement and strain. The basic idea of the method is to compare images of an object decorated with a speckle pattern before and after deformation in order to compute the displacement and strain fields. Local Subset DIC and finite element-based Global DIC are two widely used image matching methods; however there are some drawbacks to these methods. In Local Subset DIC, the computed displacement field may not satisfy compatibility, and the deformation gradient may be noisy, especially when the su

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ZHOU, YOU-LIANG, and 周祐諒. "Application of the digital image correlation method to image stitching." Thesis, 2016. http://ndltd.ncl.edu.tw/handle/17087065999970008153.

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碩士<br>國立高雄大學<br>土木與環境工程學系碩士班<br>104<br>Unmanned aerial vehicle (UAV) can be used to take aerial photographs, and it has been rapidly developed in many fields in recent years. This study uses digital image correlation method (DIC) to increase precision of image stitching and three-dimensional terrain model. DIC will be applied in two ways. Firstly, DIC is used to locate control points’ image positions in different photos, so that the precision of image stitching and three-dimensional terrain model will increase by raising control points’ precision. Secondly, DIC is used to match feature points

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Dutton, MICHAEL. "Digital Image Correlation for Evaluating Structural Engineering Materials." Thesis, 2012. http://hdl.handle.net/1974/7552.

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In the structural engineering community, a need exists for a non-contact two-dimensional measurement system which could provide information for field monitoring and greatly enhance the accuracy of numerical structural models. Recent advances have enabled the use of digital image correlation (DIC) to calculate the surface displacements of chosen targets in a series of digital images with a high degree of accuracy. Images are recorded during an experiment and are afterwards post-processed to find relevant information including, but not limited to, a) global displacement, b) relative displacement

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Dong, Zuo-Chun, and 董作群. "Using digital image correlation in triaxial stress sensor." Thesis, 2015. http://ndltd.ncl.edu.tw/handle/11275044670372839084.

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碩士<br>國立交通大學<br>機械工程系所<br>104<br>The present study aims to using DIC(Digital Image Correlation) in the development of a triaxial stress sensor system.The sensor can measure normal and shear stress at the same time. Toward this end, a standard operating procedure for manufacturing a novel triaxial stress sensor has been established. The sensor system includes a flexible and transparent material(PDMS), a series of image sensors as well as a data acquisition and processing system. Therefore, when the material deforms with external load, using image sensors and DIC algorithm to calculate the displ

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Liao, Jhan-Jhang, and 廖展章. "Digital Image Forensic Method Using Image Invariant Feature and Region Correlation." Thesis, 2012. http://ndltd.ncl.edu.tw/handle/9xum86.

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碩士<br>國立臺北科技大學<br>電機工程系研究所<br>100<br>With the coming of age of the digital era, it brings us a colorful digital life. However, the authenticity of digital image has become an important issue as the digital image is easily modified. Region duplication is a common and simple way to modify or tamper the digital image. The recent methods proposed in literature are based on spare image invariant feature (such as SIFT, SURF), and can effectively detect the geometric and brightness tampering. However, they fail to detect the tampering when the image invariant feature is inadequate, and often misclass

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Shen, Min-Chien, and 沈旻建. "Strain and Morphology Measurement by Digital Image Correlation Method." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/61983871064415332864.

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碩士<br>國立雲林科技大學<br>機械工程系碩士班<br>99<br>Digital image correlation (DIC) is a whole-field, non-contact and non-destructive strain measuring method. This method captures the surface image of a specimen before and after the deformation, and then the displacement as well as strain information about the surface of the specimen can be obtained by analyzing the change of the images. In this work, a two-step DIC is presented. In the first step, the coarse-fine iterative technique is used to search the displacement of an interested region of the specimen, and then the strain can be obtained by utilizing th

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Cai, Shun-Ji, and 蔡舜吉. "Digital Image Correlation for analysis of cracked cylindrical pipes." Thesis, 2009. http://ndltd.ncl.edu.tw/handle/41222012644669684387.

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碩士<br>國立中興大學<br>土木工程學系所<br>97<br>Abstract The stress concentration at the tip of the crack in the penstock may ignite the fast crack growth and lead to the total failure of the penstock. In the study, the technique of Digital Image Correlation (DIC) is applied to detect the strain distribution around the crack tip in a penstock subjected to the pressure of water. With the experiment results, the DIC solutions are in very good agreement with that of finite element within the elastic range of the material. This shows the technique of Digital Image Correlation is feasible in use for strain measur

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