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Object connectivity analysis (OCA) shown in a 2-dimensional (2D) example. A: a binary distribution of “black” vs. “white” pixels at certain threshold level; B: object label number (OLN) is assigned for each black pixel on the basis of the color (black or white) of 4 adjacent pixels; C: on the basis of a “flag” pixel, connectivity is identified between OLN = 2 and OLN = 4; D: small objects less than cutoff (<4 pixels in this example) are removed.
