At least one .NET example (The C# version of the SmartFrameRecall application) makes use of the AForge.NET library (http://www.aforgenet.com/) for Blob detection. This library was originally developed by Andrew Kirillov and there have been various other contributors. The framework is shipped under LGPL v3 and the full license text can be found in various places on the net.

Used version

Since version 2.18.0 of Impact Acquire the AForge.NET library is used for the example application mentioned above.