The code is provided as a free service to the image processing community and "as is", without any support beyond the documentation presented here. Neither me nor my colleagues have much spare time to help with any problems. That being said, if you run into a problem, you may ask in the forum on SourceForge or via e-Mail for help. If I find the time, I will always try to be of assistance.
A brief outline of the library framework is available here, but other than that you will have to look at the code.
The library is research code. In particular, it has not been tested except for a certain small range of use cases, and might fail spectacularly if provided with unexpected parameters (including completely crashing your system). Do not use in production environments unless you add lots of safeguards, in which case I'm happy if you can contribute back to the repository (contact me for access).