Introduction
In conventional holography, it is difficult to gain access on the three-dimensional surfaces of objects under test [1]. In contrast, there are well established techniques like the stereophotogrammetry that reconstruct surfaces of objects in dense three-dimensional point-clouds by using at least two cameras and structured illumination [2]. Recent works demonstrated, that reconstructed digital holograms can be used as images in the stereophotogrammetrical determination of object surfaces resulting in a three-dimensional point-cloud of the object [3]. Additionally, it is possible to combine the point-cloud with holographic techniques, such as holographic interferometry or phase-shifting techniques [4]. Due to such a combination, full three-dimensional deformation vectors can be calculated, providing the user with a method of high precision deformation measurements [5]. To accomplish these calculations, four cameras are used to connect three point-clouds with each other, so that the deformations measured, depending on the sensitivity-vector of each camera, can be combined to a full three-dimensional vector.
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Babovsky, H., Hanemann, M., Große, M., Kießling, A., Kowarschik, R. (2014). Stereophotogrammetric Image Field Holography. In: Osten, W. (eds) Fringe 2013. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-36359-7_162
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DOI: https://doi.org/10.1007/978-3-642-36359-7_162
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