I have a retina Image. How do I identify whether there is noise in the image ? The image visually seems fine.But That cannot be the case with other images.

How to identify with MATLAB whether an image in my case retinal image has noise. And if could be identified what is the procedure to identify the noise or to categorize images Noised and noiseless.

Answer 1

[Image Analyst]

It has noise. All images do.

[Image Analyst]

Unless by definition they don't, such as computer graphics images you synthesized and are known to be perfect. But any image taken of a real scene with a real camera will have noise.

[K Shyam Swaroop]

Thank you very much But My doubt is whether images acquired from an modern opthalmoscope or a fundus camera also will have noise?

[Walter Roberson]

Yes, for sure those devices will have noise.

What you need to ask about is what kind of noises, and what magnitudes.

[K Shyam Swaroop]

Thank you Mr.Roberson of course I do agree I get confused in this area as you said I should know what kind of Noise and its magnitude

[Image Analyst]

First, it's good to try to just do what you would like to do. Then see if you run into problems because of the noise. If not, you are golden. If you do, you have to see what you can do about the issue. Perhaps you can simply run a median filter. Perhaps you need to blur the image or run a morphological closing to smooth out noise/variation in boundaries that you detect. What you do to fix the problem depends on what the problem is.