how can i extract blood vessels from a noisy image?

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vidya
vidya 2013-11-19
评论： Image Analyst 2014-3-29
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
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Image Analyst
Image Analyst 2013-11-30
You might try Firefox - it has a built in spell checker.
ANJU
ANJU 2013-12-2
编辑：ANJU 2013-12-2
please tell me did u enhance the vessels before extraction ??

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Image Analyst
Image Analyst 2013-11-19
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.
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Image Analyst
Image Analyst 2013-11-20
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);

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更多回答（2 个）

Nisha
Nisha 2014-1-30
plz give me the code for enhancement of blood vessels in retina......
Ashokkumar
Ashokkumar 2014-3-29
What is the algorithm used the detect blood vessel? please give the code

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