Table 6.
McNemar Chi Squared Test (with 1 Degree of Freedom) with Likelihood [confidence interval (CI, %)] that Modified Absolute Gradient count (Equation 21) is statistically different from other focus functions with regard to accurate location of tissue surfaces. | |||||||||
---|---|---|---|---|---|---|---|---|---|
Eq. | Function | Training | Test Set1 | Test Set2 |
Thickness
Test Set |
||||
X2 | CI | X2 | CI | X2 | CI | X2 | CI | ||
(3) | Absolute Gradient | 0.25 | 38 | NSD* | 0 | NSD* | 0 | 0.25 | 38 |
(4) | Squared Gradient | 0.13 | 28 | 0.56 | 55 | 6.04 | 99 | 2.52 | 23 |
(5) | Brenner Gradient | 0.25 | 38 | 0.56 | 55 | NSD* | 0 | 0.06 | 20 |
(20) | Modified Absolute Gradient |
NSD* | 0 | 0.28 | 40 | 0.25 | 38 | 2.08 | 85 |
(22) | Filtered Modified Absolute Gradient |
NSD* | 0 | 0.28 | 40 | 0.25 | 38 | 0.08 | 23 |
(23) | Filtered Modified Absolute Gradient Count |
NSD* | 0 | NSD* | 0 | 0.25 | 38 | 0.13 | 28 |
(6) | Content | 22.23 | 100 | 24.01 | 100 | ||||
(8) | Image Power | 25.01 | 100 | 24.01 | 100 | ||||
(7) | Pixel Count | 25.01 | 100 | 19.01 | 100 | ||||
(9) | Tenenbaum Gradient |
1.23 | 73 | 8.03 | 100 | ||||
(10) | Energy Laplace | 0.56 | 55 | 1.13 | 71 | 19.01 | 100 | 8.22 | 100 |
(11) | Variance | 13.35 | 100 | 22.01 | 100 | ||||
(12) | Normal Variance | 17.28 | 100 | 22.01 | 100 | ||||
(13) | Autocorrelation | 0.28 | 40 | 4.69 | 97 | ||||
(14) | St Dev Autocorrelation |
23.22 | 100 | 24.01 | 100 | ||||
(15) | Range | 14.33 | 100 | 22.01 | 100 | ||||
(16) | Entropy | 15.31 | 100 | 20.01 | 100 |
NSD = No statistical difference