Image filter commands transform images into modified images, typically for
the goals of noise reduction or image feature enhancement.
The image filters are considered in the following categories.
in the table below.
| Command | Function: General Point Image Operations |
|---|
| vpix | General Point operations on a single image (2D or 3D) |
| vmath | General math operations on a single image (2D or 3D) |
| vop | General operations between two images (2D or 3D) |
| Command | Function: Image convolution |
|---|
| vsf | General filter,
Convolve (or dilate/erode) with a kernel (2D or 3D).
|
| vconv | Convolve (+binary morph
ops) with a kernel (only 2D byte images) |
| vcorr | Template Matching
(correlation, convolution, MSE, or MAE) (2D or 3D) |
| vgfilt | Gaussian filter function (2D or 3D) |
| vdog | Difference of Gaussian filter function (2D or 3D) |
| vmean | Mean filter (also vmax and vmin)
(2D or 3D) |
| vmedian | Median filter function (2D or 3D) |
| vhisteq | Histogram equalization
(optional linear or log equalization) (2D) |
| vfft | Fast Fourier Transform (FFT) (2D) |
| v3fft | Fast Fourier Transform (FFT) (3D) |
| Command | Function: Edge Enhancement and Detection |
|---|
| vedge | Generic 2D edge operator makes use of the following edge applications |
| vderiche | Deriche edge operator |
| vsobel | Sobel edge function |
| vrcross | Roberts cross edge operator |
| vedgex | Edge operator posprocessing: non-maximum suppression, and thresholding with hysteresis |
| v3grad | 3D gradient of an image sequence or
3D image |
| Command | Function: Binary Image and 3D Surface |
|---|
| vmorph | General and spherical morphological filter (2D or 3D) |
| vdist | Distance transform (2D or 3D) |
| vedist | Distance transform (2D or 3D) |
| v3bfill | 3D background fill (binary image) (2D or 3D) |
| vchull | Compute the 3D convex hull of a binary image |
| vbfilt | Geometric filter function for binary 3D images |
| v3pol | Convert binary (3D) image to 3-D Polygons |
| Command | Function: 3D Skeleton Analysis |
|---|
| v3grad | 3D gradient of an image sequence or 3D image |
| v3thin | Thin a binary 3D image to a skeleton line structure |
| v3prune | Remove short lines from a binary line image |