is it correct way to calculate the snr of a color image?

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ARUN SAI 2013-5-2

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snr=mean2(color image)/mean2(stdfilt(color image)).

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Image Analyst 2013-5-2

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No. Why do you think the local standard deviation is all noise?

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ARUN SAI 2013-5-4

is there any other way to calculate snr of color image(only with respect to one image)?

Image Analyst 2013-5-4

You can take a guess at what the noise is. That's making an assumption but with a single image, you'll need to make an assumption of some kind or other no matter what you do. Best would be to take a snapshot of a uniform scene and measure the noise. But even that requires an assumption to be made of the type of noise. You could narrow down the noise a little more if you took a bunch of shots at different exposure levels to see how the noise changed as exposure level changes.

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