how can i extract blood vessels from a noisy image?

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hello sir..I want to extract a blood vessel from a noisy image.I want only the vessel part of the image. i have attached my images. can somebody help me please.
Thanks in advance!! and thanks a ton for all response that u guys had given me!!! uu all guys have helped me a lot thanks again
sir, i want to remove the background i mean to say the white part of inside retina...how can i do it
and i want my output image to look
  5 Comments
Image Analyst
Image Analyst on 30 Nov 2013
You might try Firefox - it has a built in spell checker.
ANJU
ANJU on 2 Dec 2013
Edited: ANJU on 2 Dec 2013
please tell me did u enhance the vessels before extraction ??

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Accepted Answer

Image Analyst
Image Analyst on 19 Nov 2013
This is not so trivial. It's not like simple global or adaptive thresholding will robustly work for all images, though if you're lucky it may work for some normal (non-pathological) images. I recommend you find a suitable algorithm in section 20.5 here: http://iris.usc.edu/Vision-Notes/bibliography/contentsmedical.html#Medical%20Applications,%20CAT,%20MRI,%20Ultrasound,%20Heart%20Models,%20Brain%20Models Pick one, then code it up. If you need help with MATLAB code after that, contact us again.
  3 Comments
Image Analyst
Image Analyst on 20 Nov 2013
Sure, you can do that in two lines of code. Just make up a kernel with a positive central weight and negative outer weights and call imfilter or conv2():
kernel = [-1, -1, -1; -1, 8, -1; -1, -1, -1]; % 3 by 3 window.
unsharpMaskedImage = imfilter(grayImage, kernel);
vidya
vidya on 22 Nov 2013
thank u so much sir..Now its quite better..

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More Answers (2)

Nisha
Nisha on 30 Jan 2014
plz give me the code for enhancement of blood vessels in retina......

Ashokkumar
Ashokkumar on 29 Mar 2014
What is the algorithm used the detect blood vessel? please give the code

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