3-D deformation measurement using fringe projection and digital image correlation

Full-surface deformation measurement of anisotropic tissues under indentation

“…The combination of 2D-DIC and standard FP has been already proposed in the literature [21,27]. A schematic of the integration of 2D-DIC with the novel RFP implemented in this study is depicted in Fig.…”

“…For the undeformed configuration and for each successive deformed state, a sequence of four synthetic fringe patterns are projected onto the sample whose surface is provided with a light speckle pattern to allow DIC-based matching of image-pairs (4 s acquisition time and ß3 min between subsequent loads). The two signals (fringe pattern and speckle texture) can then easily be separated in the frequency domain by Fourier Transform analysis [27]. However, in this work, we preferred to extract the speckle texture by averaging the four images [21] and to remove the speckle noise from the fringe data by fitting a Non-Uniform Rational B-Spline (NURBS) to the data, since it represents an alternative and flexible tool that allows a better control on the fidelity of the final filtered data [25].…”

An experimental method for eliminating effect of rigid out-of-plane motion on 2D-DIC

“…Additionally, the errors of the camera parameters needed in 3D-DIC could also introduce extra error in the deformation fields eventually obtained [15]. Besides 3D-DIC, an experimental technique that combines fringe projection (FP) and 2D-DIC has also been developed to measure three-dimensional deformation [16,17]. Felipe-Sése et al have recently improved this technique by using the color encoding technique.…”

Combining digital image correlation and projected fringe techniques on a multi-camera multi-projector platform

“…The projected fringe technique is then applied to estimate surface profile and out-of-plane displacements, while the 2-D DIC technique is used to determine in-plane displacements. References [4] and [5] describe a simpler system using one camera and one projector, in which the fringe pattern is isolated from the speckle pattern during the computation stage using a Fourier transform. In reference [6], sinusoidal fringes and speckle pattern are captured in two temporally discrete steps and processed in a similar way to the above-mentioned methods.…”