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Filter kernel combinations for isotropic and directional case.
| Isotropic kernel | Directional kernel | |
|---|---|---|
| Type A | Mean filter | Mean filter |
| Type B | Mean filter | Gaussian filter |
| Type C | Mean filter if | Mean filter if |
| LCM(x, y) < 0.5 ⋅ τ | LCM(x, y) > 1.5 ⋅ τ | |
| Gaussian filter otherwise | Gaussian filter otherwise |
