can we find what kind of noise present in an image

can we find what kind of noises present in an image

Answer 1

[Image Analyst]

Subtract the "true" image and then look at the spectrum of the noise to see what known type of noise it resembles.

[chitresh]

can u plz explain with some example if possible @image analyst

[Image Analyst]

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.

Answer 2

[Walter Roberson]

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.

[chitresh]

walter yes i have a original image then from that i generate another image, now tell me what i can do with this kind of images and how i can improve it

[Image Analyst]

Like I told you in http://www.mathworks.com/matlabcentral/answers/106157#comment_180155, which apparently is the original discussion on this topic, I don't think denoising bitplanes will give you a good image but you said you were going to try and let us know. How did that go? What did you try? Did you try median filter or imclose() or imopen()? I bet they would give a crummy looking image.

[chitresh]

recently i try image enhancement contrast adjustment techniques and i got results too now how useful they are and what the difference how much image get improve i want to know that

[chitresh]

@image analyst dear if you get some mail id then let me know i want to discuss lots of stuff and results of my work with you

[Image Analyst]

I don't take email and don't have time for a lot of offline consulting. Sorry.

[chitresh]

its ok thanks for replying