Without extra library?! Well, AForce.NET is using .NET only, so, here is the plan:
- Try to solve the problem all by yourself;
- When you get enough experience and still face problems, build AForge.NET library and try to understand how it works; may be it will help you;
- Go back to item 1; repeat those items until success;
- If you feel you're not making further progress but your problem is not yet solved, ask a question at CodeProject, this time more concrete.
A hint: get red channel only and try to perform Blob Detection