How to recognize objects or patterns in one image?

suppose I have two images one contains circle and other contains square,I just want to give inpu开发者_JS百科t as this images. program should recognize which one is circle and which one is square. how i can implement this using c# language?

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There are a few image recognition libraries out there. Try aforge: http://code.google.com/p/aforge/. Another one is EmguCV for .Net.

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using Emgu.CV:

exactly what you want: http://www.emgu.com/wiki/index.php/Shape_(Triangle,_Rectangle,_Circle,_Line)_Detection_in_CSharp