Table 1.

Comparison of segmentation accuracy with other works (intersection over union (IOU) threshold is defined as 0.8).

Methods	Outer Boundary	Inner Boundary	Execution Time Per Image
Circular Hough transform [46]	90.80%	93.70%	0.024
MIGREP [8]	43.3%	69.50%	0.011
Faster-RCNN [4]	67.84%	43.25%	0.05
U-Net [37]	7.6 %	0 %	0.007
Proposed method	98.9%	97.7%	0.007