Is there any method to calculate segmentation coefficent automatically according the same size of my boundary area.

I have a breast mammogram image.

you can see on files , image 1 show boundary of tumour suspicious area(inside red circles)

I made segmentation with using im2bw function and with segmentation coefficient number 0.75

and I got second image.

But when I use 0.63 segmentation coefficient number, I got closer size of in my first image's bounding circles.

But I am trying this every step and every step to get closest size with my bounding size

I mean I am trying many coeefficient number to get closest size of segmentation tumour with the my first image's inside bounding circles size tumour.

How will I calculate coeefficient number automatically or easier way ?

img=imread('image.jpg');
A=im2bw(img,0.75);
figure,imshow(A);
B=im2bw(img,0.63);
figure,imshow(B);

Answer 1

[Srija Kethiri]

Hi Ali,

I am assuming by segmentation coefficient you are referring to the threshold for segmentation

You can use the graythresh() function to find the threshold for segmentation.

X = graythresh(img);
C = im2bw(img,X);

Refer to this documentation to know more about the function graythresh- Global image threshold using Otsu's method - MATLAB graythresh (mathworks.com)

Hope this helps!