It works, but has it's problem, like memory leaks if you forget to dispose the objects and an upgrade to a newer version had a bug in it's ubuntu binaries that any simple test would have caught.
There is a higher quality commercial wrapper that is only free for gpl'ed solutions.
Which is what I see with some projects, even though the software itself is free, the c# wrapper done by a third party costs money which makes me loathe to use it, as it hinders reuse.
Take care, Martin
I’ve used both off and on for the last 5 years and generally find Accord.NET to be more pleasant, though most of the attention online goes to OpenCV, so there tends to be more examples for it.
OpenCV is a neat library though. I used it to do some quick and dirty measurements + sprite generation on a couple of hundred shark teeth for a group project in school. We made an educational virtual fossil dig website.