How to use vdub filters in my own programs?

[kovi]

I have a few self-developed programs (video/still image processing tools), and I need filtered resizing. I've got sources, but it's too slow, not optimized. VDub's is quite fast.
Please let me know how to use the dlls(what are the procedurew names, parameters). The problem is that I program in delphi :(

Thanks!