Hi Ruben:

There isn't an online resource per se for each tool's syntax, but virtually all of CMTK's command line tools (not currently shell scripts, but that is in the works) support multiple ways of getting on-the-fly command line help. Simply run the tool with either "--help" option (for simple help text), "--man" (for man page-style documentation; pipe through nroff etc.), "--wiki" (for MediaWiki-style documentation). Note that "--help" will by default exclude "advanced" options to keep things simple. To get the complete list of all supported options, use "--help-all" instead.

Regarding fractional affine transformations - no, sorry, there is no such thing. You can "fake" it rather easily, though - the standard file format for affine transformations in CMTK lists canonical transformation parameters, i.e., translation, rotation angles, scale factors, and shear coefficients, in a human-readable format. You can read such a file and simply compute the fractional parameters yourself, then write the result in a new transformation file in the same, straight-forward format.

Note that this is not truly a fractional transformation, though, in the sense that if you take 1/2 of each parameter, you will not get a transformation that, when concatenated with itself, gives you the original transformation. That is, you would not get the "square root" affine matrix using fractional 0.5. To do that kind of thing, especially for other fractional values, would require some more involved matrix algebra, and that isn't even supported by the back-end library at this point.

Best,
  Torsten

Originally posted by Ruben Portugues: