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. Author manuscript; available in PMC: 2021 Mar 5.
Published in final edited form as: J Mech Behav Biomed Mater. 2019 Nov 29;103:103560. doi: 10.1016/j.jmbbm.2019.103560

Fig. 1.

Fig. 1.

Optical layout of the four-camera dynamic speckle interferometer (d-ESPI) (Bruno et al., 2018): a corneoscleral shell is observed along four oblique directions and orthogonally illuminated. The pixel coordinates (ik, jk) in each camera sensor are obtained by projecting a generic point P(X,Y,Z). Four markers (red disk with a black cross inside) are illustrated in the scheme to detect the ground control points (GCP = [X*,Y*, Z*]T) used in Eq. (4) to constrain in the WCS, in terms of scale and absolute position, the 3D shape reconstructed by multi-stereo software.