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Table 2 Error metrics of the four methods compared with the ground truth

From: Tendon-motion tracking in an ultrasound image sequence using optical-flow-based block matching

Case

Average absolute error Ea (pixels)

Elbow (1 pixel = 0.075 mm)

Finger (1 pixel = 0.0265 mm)

Optical flow

MKBM

Adaptive MKBM

OFTB-MKBM

Optical flow

MKBM

Adaptive MKBM

OFTB-MKBM

1

12.69

32.57

3.56

1.66

18.51

21.21

2.07

1.71

2

6.26

19.42

5.06

1.74

4.27

29.86

1.90

1.84

3

8.62

30.41

2.22

1.02

3.77

18.46

3.58

2.48

4

2.22

7.56

1.14

0.72

18.23

31.85

4.57

3.37

5

6.86

20.42

3.45

3.22

42.23

28.09

5.79

4.86

6

7.95

21.39

6.27

2.36

6.25

17.99

8.27

6.11

7

9.35

5.07

5.62

2.93

9.59

17.15

1.74

1.65

8

10.97

27.71

4.37

2.12

9.95

12.96

5.18

3.94