Automatic Image Segmentation of three steel ropes using Image Processing Tools

Hello there,

I have an issue with dividing the image of three ropes into segments. You can see the original image (3104x3104) below:

I'd like to get some results of segmentation process like this:

How can I divide image into segments? What is the background should I choose? Please, help me with that.

I've written the code below, but I get unexpected results. How can I fix it?

I = imread('rope.jpg')
gs = im2gray(I)
imshow(gs)
imhist(gs)

%Adjust image contrast ratio%
Aadj = imadjust(gs);
imshow(Aadj)

%create binary image automatically
imhist(Aadj)
bw = im2bw(Aadj);
imshow(bw);

%Extract the first two largest objects from the binary image.
bw = bwareafilt(bw,[400, inf]);
%Fill holes in the extracted object regions.

bw = 1 - bw;
imshow(bw)