Table 3.
Number of features with significantly different values when measured in a phantom with a PLA or PVC rod.
| Feature | Preprocessing technique | Cork | Dense Cork |
Hemp Seeds |
Rubber | Solid Water |
|---|---|---|---|---|---|---|
| GLCM (N=22) |
Thresholding | 12 | 5 | 7 | 1 | 13 |
| Thresholding, smoothing | 4 | 4 | 18 | 11 | 15 | |
| Thresholding, 8-bit depth resampling | 11 | 7 | 6 | 1 | 12 | |
| Thresholding, smoothing, 8-bit depth resampling | 4 | 3 | 18 | 10 | 13 | |
| GLRLM (N=11) |
Thresholding | 7 | 6 | 6 | 3 | 6 |
| Thresholding, smoothing | 7 | 6 | 7 | 7 | 10 | |
| Thresholding, 8-bit depth resampling | 5 | 5 | 4 | 3 | 10 | |
| Thresholding, smoothing, 8-bit depth resampling | 5 | 5 | 8 | 5 | 6 | |
| NGTDM (N=5) |
Thresholding | 0 | 0 | 0 | 0 | 3 |
| Thresholding, smoothing | 0 | 4 | 1 | 0 | 1 | |
| Thresholding, 8-bit depth resampling | 0 | 2 | 0 | 0 | 1 | |
| Thresholding, smoothing, 8-bit depth resampling | 0 | 1 | 1 | 0 | 3 | |
| Intensity (N=11) |
Thresholding | 8 | 3 | 7 | 3 | 8 |
| Thresholding, smoothing | 5 | 5 | 11 | 8 | 9 | |
| Thresholding, 8-bit depth resampling | 7 | 4 | 5 | 3 | 7 | |
| Thresholding, smoothing, 8-bit depth resampling | 6 | 5 | 9 | 8 | 9 | |
GLCM: gray-level co-occurrence matrix, GLRLM: gray-level run length matrix, NGTDM: neighborhood gray tone difference matrix.