I've seen there are a few of them. opencvdotnet, SharperCV, EmguCV, One on Code Project.
Does anyone have any experience with any of these? I played around with the one on Code Project for a bit, but as soon as I tried to do anything complicated I got some nasty uncatchable exceptions (i.e. Msgbox exceptions). Cross platform (supports Mono) would be best.
I started out with opencvdotnet but it's not really actively developed any more. Further, support for the feature I needed (facedetection) was patchy. I'm using EmguCV now: It wraps a much greater part of the API and the guy behind it is very responsive to suggestions and requests. The code is a joy to look at and is known to work on Mono.
I've wrote up a quick getting-started guide on my blog.
SharperCV was our tool of choice, and it doesn't let us down, for our robotics project. Even though it is currently marked as abandoned, the code is in really good shape, requires only minor tweaking to customize it for your need. No msgboxes, and actually very sane exception handling.
Not cross-platform, though, due to the interoperability layer.
