Signal to noise ratio color image (code) for dB
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I am trying to compute signal to noise ratio (dB) in color images as follows:
noisydata = imnoise(original,'gaussian',0.0,0.1); % mean = 0.0, variance = 0.1
[var_orgR, var_noiseR] = snr(noisydata(:,:,1),original(:,:,1));
[var_orgR, var_noiseR] = snr(noisydata(:,:,2),original(:,:,2));
[var_orgR, var_noiseR] = snr(noisydata(:,:,3),original(:,:,3));
SNR= 10*log10((var_orgR + var_orgG + var_orgB)/(var_noiseR + var_noiseG + var_noiseB));
function [var_original, var_noise] = snr(noisydata, original)
mean_original = mean(original(:));
tmp = original - mean_original;
var_original = sum(tmp(:).^2);
noise = noisydata - original;
mean_noise = mean(noise(:));
tmp = noise - mean_noise;
var_noise = sum(tmp(:).^2);
end
The problem is I get value of SNR = 0.0330, I would like to get SNR in dB like 1 dB, 5 dB, etc.
Could any one please guide/suggest how to obtain SNR in dB?
Thank you. Dbs
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Risposte (2)
Image Analyst
il 3 Feb 2013
Where did you get these formulas? I'm not sure I agree with them. In fact I don't, unless you can show me some reference that say otherwise.
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Image Analyst
il 3 Feb 2013
I don't think that would fix it. I would need proof. Anyway, I don't know what a "fix" is. Like I said, you asked how to get the number in decibels and I told you that it's already in decibels.
Toqeer Mahmood
il 9 Ott 2015
Dear Dadhichi
I am also confused in the same problem, I also want to find SNR with the whole number as 5dB, 10db, 15dB etc. Please send me the working code to find it, if possible for you (my email is toqeer.mahmood@yahoo.com).
Thanks in advance, waiting for your kind reply.
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