MATLAB: How can i extract blood vessels from a noisy image

Question

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

Answer 1

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.