how can i extract blood vessels from a noisy image?

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

[ANJU]

hello vidya ... please tell me which filter u applied for extracting the blood vessels..?

[vidya]

gabor filter sir..actually i did not extract vessels till now..i just have my image in convoluted form

[MANI MANI]

can u pl. send the code u hv used to get the o/p vein image..

[Image Analyst]

You might try Firefox - it has a built in spell checker.

[ANJU]

please tell me did u enhance the vessels before extraction ??

Answer 1

[Image Analyst]

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.

[vidya]

yes sir..is that possible to blur the background and keep only the foreground vessel part.I just want the back ground(white and black color) to be removed and only vessels to remain..is it not possible my any enhancement of by background removal technique

[Image Analyst]

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]

thank u so much sir..Now its quite better..

Answer 2

[Nisha]

plz give me the code for enhancement of blood vessels in retina......

Answer 3

[Ashokkumar]

What is the algorithm used the detect blood vessel? please give the code

[Image Analyst]

Algorithms are given in papers listed here: http://iris.usc.edu/Vision-Notes/bibliography/contentsmedical.html#Medical%20Applications,%20CAT,%20MRI,%20Ultrasound,%20Heart%20Models,%20Brain%20Models