| ::convol_image | Convolve an image with an arbitrary filter mask. |
| ::gray_inside | Calculate the lowest possible gray value on an arbitrary path to the image border for each point in the image. |
| ::gray_skeleton | Thinning of gray value images. |
| ::lut_trans | Transform an image with a gray-value look-up-table |
| ::principal_comp | Compute the principal components of multi-channel images. |
| ::symmetry | Symmentry of gray values along a row. |
| ::topographic_sketch | Compute the topographic primal sketch of an image. |