is this block represents noise?

5 Feb. 2013
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i have converted noisy image into 4*4 block ,then i have found std of each block and i have found minimum std from all block.
now my question is that this block of minimum std is a uniform or not?
is this block represents noise?

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vipul utsav
vipul utsav
am 5 Feb. 2013

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