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tthis right way to find

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vipul utsav
vipul utsav 2012-12-28
关闭： MATLAB Answer Bot 2021-8-20
a=sqrt(0.5)*randn(400)
snr=1/0.5 %0.5 is variance and signal=1 consider as normalized
snrdb=10*log(snr)
is this right way to find actual snr wnen i add 'a' marix as noise in a original image.(becuase i needs to add different variance noise in original images and comparing result)

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Matt J
Matt J 2012-12-28
编辑：Matt J 2012-12-28
It's the right way assuming the "original image" satisfies signal=1, however it is that you're measuring that.
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Image Analyst
Image Analyst 2012-12-28
For background, Matt, he has asked essentially this same question 14 times (yes, fourteen) times this month as separate postings - how to get the signal-to-noise ratio when you don't know the signal and you don't know the noise, all you know is the actual noisy signal and sometimes what specific SNR you want. See his profile.
Matt J
Matt J 2012-12-28
Yes, I've seen the similarity in his questions. Wasn't sure they were identical, though.

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