| dual_rank | Opening, Median and Closing with circle or rectangle mask. |
| grey_bothat | Perform a gray value bottom hat transformation on an image. |
| grey_closing | Perform a gray value closing on an image. |
| grey_dilation | Perform a gray value dilation on an image. |
| grey_erosion | Perform a gray value erosion on an image. |
| grey_opening | Perform a gray value opening on an image. |
| grey_tophat | Perform a gray value top hat transformation on an image. |
| load_grey_se | Load a structuring element for gray morphology. |
| make_disc_se | Generate ellipsoidal structuring elements for gray morphology. |
| max1__ | Determine the maximum gray value within a rectangle. |
| min1__ | Determine the minimum gray value within a rectangle. |
| range__ | Determine the gray value range within a rectangle. |