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Concrete microstructure. (A) Target system: a binarized image of a cross-section of concrete (27). The linear size of the digitized texture is NL = 170 pixels. (B) S2-alone reconstruction. (C) S2–Fss hybrid reconstruction. (D) S2–C2 hybrid reconstruction. All the reconstructions are associated with a final energy (error) E ≈ 10−8. (E) The unconstrained lineal-path function L of the reconstructions and the target image. Pixel size supplies the unit for the distance r.
