VLFeat - Tutorials > Miscellaneous utilities

# VLFeat.org

Tutorials> Miscellaneous utilities

This is a list of other notable MATLAB functions included in VLFeat

- ``vl_imsmooth smoothes an image by a Gaussian kernel (simple but very useful as it is generally much faster than MATLAB's general purpose smoothing functions).
- ``vl_plotframe plots a variety of feature frame types (such as oriented ellipses).
- ``vl_binsum performs binned summations, useful as a building block for the fast computation of histograms. ``vl_whistc computes weighed histograms.
- ``vl_imarray and ``vl_imarraysc arrange and visualize multiple images in a grid
- ``vl_imsc scales the image range;
- ``vl_tightsubplot is similar to built-in ``subplot, but produces narrower margins.
- ``vl_cf makes a copy of a figure.
- ``vl_rodr and ``vl_irodr compute the Rodrigues' formula and its inverse
- ``vl_override overrides members of a structure with members of another structure.
- ``vl_imwbackward warps an image by the inverse mapping method (generally much faster than MATLAB general purpose warping functions).
- ``vl_waffine computes the affine warp of a set of points. ``vl_tps, ``vl_tpsu, ``vl_wtps compute the thin-plate spline warp of a set of points. ``vl_witps computes the inverse thin plate warp of a set of point (by numerically inverting the transformation). They may be used in combination with ``vl_imwbackward.
- ``vl_xyz2lab, ``vl_xyz2luv, ``vl_xyz2rgb, ``vl_rgb2xyz convert color spaces.
- ``vl_rcos, ``vl_gaussian, ``vl_dgaussian, ``vl_ddgaussian compute some useful special functions.