Segment Features (C-Axis Misalignment)¶
Group (Subgroup)¶
Reconstruction (Segmentation)
Description¶
This Filter segments the Features by grouping neighboring Cells that satisfy the C-axis misalignment tolerance, i.e., have misalignment angle less than the value set by the user. The C-axis misalignment refers to the angle between the <001> directions (C-axis in the hexagonal system) that is present between neighboring Cells. The process by which the Features are identified is given below and is a standard burn algorithm.
- Randomly select a Cell, add it to an empty list and set its Feature Id to the current Feature
- Compare the Cell to each of its six (6) face-sharing neighbors (i.e., calculate the c-axis misalignment with each neighbor)
- Add each neighbor Cell that has a C-axis misalignment below the user defined tolerance to the list created in 1. and set the Feature Id of the neighbor Cell to the current Feature
- Remove the current Cell from the list and move to the next Cell and repeat 2. and 3.; continue until no Cells are left in the list
- Increment the current Feature counter and repeat steps 1. through 4.; continue until no Cells remain unassigned in the dataset
The user has the option to Use Mask Array, which allows the user to set a boolean array for the Cells that remove Cells with a value of false from consideration in the above algorithm. This option is useful if the user has an array that either specifies the domain of the "sample" in the "image" or specifies if the orientation on the Cell is trusted/correct.
After all the Features have been identified, a Feature Attribute Matrix is created for the Features and each Feature is flagged as Active in a boolean array in the matrix.
Parameters¶
| Name | Type | Description |
|---|---|---|
| C-Axis Misorientation Tolerance (Degrees) | float | Tolerance (in degrees) used to determine if neighboring Cells belong to the same Feature |
| Use Mask Array | bool | Specifies whether to use a boolean array to exclude some Cells from the Feature identification process |
Required Geometry¶
Image
Required Objects¶
| Kind | Default Name | Type | Component Dimensions | Description |
|---|---|---|---|---|
| Cell Attribute Array | Quats | float | (4) | Specifies the orientation of the Cell in quaternion representation |
| Cell Attribute Array | Phases | int32_t | (1) | Specifies to which Ensemble each Cell belongs |
| Cell Attribute Array | Mask | bool | (1) | Specifies if the Cell is to be counted in the algorithm. Only required if Use Mask Array is checked |
| Ensemble Attribute Array | CrystalStructures | uint32_t | (1) | Enumeration representing the crystal structure for each Ensemble |
Created Objects¶
| Kind | Default Name | Type | Component Dimensions | Description |
|---|---|---|---|---|
| Cell Attribute Array | FeatureIds | int32_t | (1) | Specifies to which Feature each Cell belongs. |
| Attribute Matrix | CellFeatureData | Cell Feature | N/A | Created Feature Attribute Matrix name |
| Feature Attribute Array | Active | bool | (1) | Specifies if the Feature is still in the sample (true if the Feature is in the sample and false if it is not). At the end of the Filter, all Features will be Active |
Example Pipelines¶
License & Copyright¶
Please see the description file distributed with this Plugin
DREAM.3D Mailing Lists¶
If you need more help with a Filter, please consider asking your question on the DREAM.3D Users Google group!