Emgu CV is a cross platform .Net wrapper to the Intel OpenCV image processing library. Allowing OpenCV functions to be called from .NET compatible languages such as C#, VB, VC++, IronPython etc. The wrapper can be compiled in Mono and run on Linux

Opencv C# Library (wrapper) and example

This a simple application developed in C# and uses the Emgu CV library. Emgu CV lib is a wrapper around OpenCV than enables .NET languages to use the OpenCV lib. The algorithm showcased in the source code is about template matching and object recog

Emgu CV Library Documentation