The VLFeat documentation has three parts:
Matlab help. VLFeat Matlab commands embed documentation that can be viewed with the Matlab
helpcommand (for instance, typehelp vl_siftto read thevl_siftcommand documentation). For convenience, the same documentation is also available in HTML format.C API. VLFeat source code embeds extensive documentation. This includes descriptions of all algorithms which can be useful even if you do not plan to use the C library directly.
Man pages. The command line utilities bundled with VLFeat are described by Unix man pages. These are found in the
src/subdirectory, or can be viewed in HTML format.
In addition to the documentation, there are also tutorials which introduce many of the algorithms contained in the library.