removing flim artifacts from image

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kash
kash on 24 Dec 2013
Commented: kash on 31 Dec 2013
I have an MRI image in which it contains artifacts and white labels,kindly tell how to remove these labels and artifacts,I have uploaded the image
  3 Comments
Walter Roberson
Walter Roberson on 25 Dec 2013
I removed the image link pending clarification on this issue.
kash
kash on 25 Dec 2013
Sir there is no other way proceeding this

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Accepted Answer

Image Analyst
Image Analyst on 24 Dec 2013
If you want to do it automatically, if you can depend on the white letters and other annotations being 255 or 65535, then you can just erase them
maxValue = max(grayImage(:))); % most likely 255 or 65535 depending on 8 or 16 bit.
whiteStuff = grayImage == maxValue;
grayImage(whiteStuff) = 0; % Set white things to black.
Now if there are parts inside the skull that could also be the sam brightness then you'd need to use a different strategy. You'd have to find the background intensity, threshold, and find the largest blob (see my attached demo). Then invert that binary image and mask your original with it.
binaryImage = grayImage > 50; % or whatever value the brightest part of the background has.
binaryImage = imfill(binaryImage, 'holes');
largestBlob = ..... - see my demo
% Now erase
grayImage(~largestBlob) = 0;
This is probably more robust than the first method because it can handle super bright things inside the skull.
  14 Comments
Image Analyst
Image Analyst on 30 Dec 2013
Why? Shouldn't the black background have about the same intensity in each image?

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More Answers (1)

Matt J
Matt J on 24 Dec 2013
I think you could just use H=imfreehand(...) to draw an ROI around the anatomy that you want to keep.
Then you can do
mriImage=mriImage.*(~H.createMask);
to get rid of it.

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