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Fig. 9 | BMC Bioinformatics

Fig. 9

From: ATMAD: robust image analysis for Automatic Tissue MicroArray De-arraying

Fig. 9

Affine approximation of the grid deformation. The distorted grid Λ which one only observes partially the set of point \(\mathcal {X}_{0} \subset \Lambda \) (shown in blue crosses) is approximated by the oblique (regular) grid Λ0 (black circled dots). The latter is characterized by the average distance \(\bar {d}\) between its points, two principal directions which are presented by two vectors (e1,e2) (red arrows), and the global translation \(\hat {\mathbf {t}}\) (green arrow) of the grid with respect to the origin (0,0) (gray square dot)

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