Tell me more ×
Mathematica Stack Exchange is a question and answer site for users of Mathematica. It's 100% free, no registration required.
up vote 3 down vote favorite
1

I am wondering to how to filter bright dots from background noise. I have used gradient filter in mathematica but it doesnt help, is anyway I can plot Intensity versus background noise with threshold control or filter it better way. enter image description here

share|improve this question
Do you want to filter out the "worm" too? – belisarius Jan 24 at 22:47
yes, it is dust – Jay Jan 24 at 22:53
What about a median filter? – s0rce Jan 25 at 5:53
Does MinFilter[img, 5] give something acceptable? – kguler Jan 25 at 8:50
If you had an image without any interesting dots (like a test picture), you might be able to find the differences between the two images... – cormullion Jan 25 at 10:11
show 3 more comments

1 Answer

up vote 3 down vote accepted

We could do with ground truth data to assess the result. Is this acceptable as a first step?

Manipulate[
    HighlightImage[
         i, 
         result = Binarize[TopHatTransform[i, radius], thr]], 
    {{radius, 4}, 1, 10, 1}, {{thr, .015}, 0, .2}]

enter image description here

share|improve this answer

Your Answer

 
discard

By posting your answer, you agree to the privacy policy and terms of service.

Not the answer you're looking for? Browse other questions tagged or ask your own question.