need a help in image processing or vision

Hi I have this image :: http://img12.imageshack.us/img12/582/7mk.png I capture it use webcam
the problem is in some position the object appear as only circle and in other position the the entire object appear as that in the border !!!!!!
How can I solve the problem so can I see always the object as circle >>>???
best regads

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Question posée :

le 25 Juil 2013

Clôturé :

le 20 Août 2021

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