now my question is that which 'a' i should take?

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vipul utsav
vipul utsav 2013-3-16
I is 20*20 image of class uint8;
a=im2double(I) and a=double(I) gives different result.
now generate noisy image using noisy=a+n;
where,n=0+10*randn(size(I))
now my question is that which 'a' i should take?(either a=im2double(I) ora=double(I))

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回答（1 个）

Image Analyst
Image Analyst 2013-3-16
im2double() scales images to the 0-1 range whereas double() leaves their values alone. It just depends on what range you want the image to be in before you add noise to it.
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vipul utsav
vipul utsav 2013-3-17
编辑：vipul utsav 2013-3-17
which is better for noise estimation as your thought?(when i want to add noise in original image manually )
Image Analyst
Image Analyst 2013-3-17
Either one can do it. I tend to not use im2double.

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