anybody help me how to remove noise from a picture? Consider the image which simulates the effect of mains signal interference in the amplifying electronics of the image sensor? http://imageshack.us/photo/my-images/152/bbbbj.png/
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Is this your homework exercise? It sounds like a typical homework problem.
You can easily just fft2() your image, display it and find the spike, then zero out or reduce that spike, and finally inverse transform. If you're taking a class they should have gone over that. It's pretty straightforward.
What find of filters are you looking for specifically?
Here are some examples of deblurring filters in the image processing toolbox
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