shape based object identification from an image?

how is it possible to do shape based detection from an image? example circle or rectangle? i have seen color wise but i need to do shape wise! any idea?

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does this code recognises similar round objects as welll??
You can try another code from file exchange
http://www.mathworks.com/matlabcentral/fileexchange/?term=shape+recognition
There are several techniques in recognises shape.
This algoritham can help to detect animals,humanbeings,like any object

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