How to do segmentation for detecting microaneurysms?

2 vues (au cours des 30 derniers jours)
Caecillia Veren
Caecillia Veren le 13 Fév 2014
hi, please help me. i want to create a program for the detection of microaneuryms in diabetic retinopathy diseases. i have retinal image and success doing vascular segmentation. the point is, i've been using a region growing from http://www.mathworks.com/matlabcentral/fileexchange/32532-region-growing-2d3d-grayscale but it just give me one object of microaneurysm like this
i want the result like this
this is my original image after using adaptive histogram
what should i do? or is there a recommended method that i can use?

Réponses (2)

Nitin
Nitin le 16 Fév 2014
Hope this gets you started:
I=imread('retinal.PNG'); I2 = rgb2gray(I); I_bin = I2>150;
In the next step, you can choose the smaller regions you are interested in using bwselect and or regionsprops based on your criteria

Image Analyst
Image Analyst le 16 Fév 2014
Modifié(e) : Image Analyst le 3 Sep 2021
People have done this before and published their methods. Look for them in section 20.5 here:
Most likely, you'll find robust algorithms won't be just a hundred or two hundred lines long, as I don't expect that it's a simple problem.
A quick and dirty, non-robust method would be something like this
  1. threshold image
  2. find areas and perimeters
  3. remove largest region (the main vessel network)
  4. compare circularities (Perimeter^2/(4*pi*area)) of remaining regions and keep regions with low circularity values to keep compact blobs rather than stick-like blobs.
  2 commentaires
Mustapha Seidu
Mustapha Seidu le 3 Sep 2021
Hi, this is the second time I am coming across this link today. Can you provided an updated link pls? This particular one has nothing relating to the problem. Thank you.
Image Analyst
Image Analyst le 3 Sep 2021
Where was the first one, if you still remember. Obviously the link worked once but I guess they changed it from
http://iris.usc.edu/Vision-Notes/bibliography/contentsmedical.html#Medical%20Applications,%20CAT,%20MRI,%20Ultrasound,%20Heart%20Models,%20Brain%20Models
to the new link:
I'll change it in my original answer also.

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