Research Article
Prediction of Settling Velocity of Nonspherical Soil Particles Using Digital Image Processing
Table 2
Description of shape properties of soil particles.
| Shape properties | Description |
| Area | The area of the particle | Aspect | The ratio between the major axis and the minor axis of the ellipse equivalent to the particle | Major axis | The length of the main axis of the ellipse equivalent to the particle | Minor axis | The length of the minor axis of the ellipse equivalent to the particle | Maximum diameter | The length of the longest line joining two outline points and passing through the centroid | Minimum diameter | The length of the shortest line joining two outline points and passing through the centroid | Mean diameter | The average length of the diameters measured at two degree intervals joining two outline points and passing through the centroid | Maximum radius | The maximum distance between particle’s centroid pixel position and its perimeter | Minimum radius | The minimum distance between particle’s centroid pixel position and its perimeter | Perimeter | The length of particle’s outline | Radius ratio | The ratio between maximum radius and minimum radius for each particle, as determined by maximum radius/minimum radius | Roundness | The roundness of each particle, as determined by (4 ∗ pi ∗ area)/(perimeter2) | Fractal dimension | The fractal dimension of the particle’s outline |
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