How to detect a white square in a black image?..................... [closed]

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Published on 2010-04-18T19:48:10Z Indexed on 2010/04/18 20:23 UTC
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how can i detect white image surrounded by black image

000 000 000 000 000 255 255 255 000 000 255 255 255 000 000 255 255 255 000 000 000 000 000 000 000

please tell how i approach

and how can calculate length and widht of the square

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