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can we find what kind of noise present in an image

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chitresh
chitresh 2013-11-16
评论： chitresh 2013-11-18
can we find what kind of noises present in an image

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回答（2 个）

Image Analyst
Image Analyst 2013-11-16
Subtract the "true" image and then look at the spectrum of the noise to see what known type of noise it resembles.
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chitresh
chitresh 2013-11-17
can u plz explain with some example if possible @image analyst
Image Analyst
Image Analyst 2013-11-17
Evidently from your reply to Walter below, you don't really want to know what kind of noise it is, like Poisson, Additive Gaussian, 1/f noise, shot noise, or whatever. You want to denoise the image of individual bitplanes like we talked about in your duplicate question http://www.mathworks.com/matlabcentral/answers/106157#comment_180155. That is a different question than trying to get a noise only image so that you can "find what kind of noises present in an image". So I won't bother trying to answer the question in this question, and spend time creating a demo for you to do that when apparently that's not what you want or need.

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Walter Roberson
Walter Roberson 2013-11-16
If all you have is the image, then NO: you cannot tell whether the image has noise or if the image is a true representation of what is actually present. Consider Cosmic Microwave Background Radiation, long thought to be noise but in fact an important signal in its own right.
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Image Analyst
Image Analyst 2013-11-17
I don't take email and don't have time for a lot of offline consulting. Sorry.

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