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Table 2 2-D shape analysis: Area, orientation, and eccentricity descriptors of test pieces.

From: Geometrical Feature Extraction from Ultrasonic Time Frequency Responses: An Application to Nondestructive Testing of Materials

Test Piece Area Orientation Eccentricity
0.5 mm 1 and 2 651 −0.0953 0.8762
0.7 mm 3 and 4 383 −0.0344 0.8329
1.3 mm 5 and 6 258 −0.3297 0.6965
1.8 mm 7 and 8 279 −0.1041 0.6423