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tthis right way to find
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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
il 28 Dic 2012
Modificato: Matt J
il 28 Dic 2012
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
il 28 Dic 2012
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
il 28 Dic 2012
Yes, I've seen the similarity in his questions. Wasn't sure they were identical, though.
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