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Fig. 2 —Schematic diagrams of measures of similarity to local
structures and basic conditions of these local structures. For line structure,
Eigen values 
2 and 3 along directions of greater gray-level
changes are larger than Eigen value 1, which corresponds to direction
e1 of smaller gray-level change (
0). For blob that represents
polyp in colon, change of gray level is large in all three directions of blob.
For sheetlike structure, Eigen value 3 along direction of greater
gray-level change is larger than Eigen values 1 and 2, which
correspond to directions e1 and e2 of smaller gray-level
change ( 0).
