Fig. 1. Dual-restriction-box assistance.
Fig. 2. Samples for contour marking.
Fig. 3. Boundary point set. (a) Sub-image in restriction box, (b) Manual marking (11 points), (c) Piece-wise linear interpolation (31 points).
Fig. 4. Key point detection. (a) Feature points, (b) Two fitted lines, (c) Angle bisector, (d) Key point.
Table 1. Accuracy comparison.
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