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Fig. 2
Figure 2. Pixel noise removal. (A–C) Area-based noise removal of slice 36. (B) Two areas after binary thresholding and inverting. (C) After removing holes and debris using a 20-pixel area cutoff. The same area size cutoff was used for all slices. (D–F) Rank-based cluster removal of slice 45. (E) After binary thresholding and inverting. Four largest clusters are ranked by size (1 is the largest and includes all the background in this slice). Inset shows enlarged view of the rectangle in (D); the cluster ranked number 4 is circled in blue. Holes and debris are marked by red circles, as in (B). (F) Binary mage after rank-based noise removal. The three largest clusters were kept.