After a thresholding operation and an extraction of connected components, the hexagonal mesh can be fitted by detecting the dominant inter-blob distance. The difficulty stems out of the missing nano-structures and from a slight projective transformation (homography) due to the non-orthogonality of the imaged object with respect to the electron beam. The solution implements an EM-inspired solution, iteratively estimating the homography and the mesh-coordinates of the nano-structures. The thresholded nanostructures can be seen below (green for the disk-shaped blobs, red otherwise, blue for the mesh neighbourhing relations).
The fitted mesh wil look like the following:
© 2019 DREAM Lab – Georgia Tech Lorraine