use this code
clear all
close all
clc
img=imread('line2.png');
img1=bwareaopen(~img,100);
se=strel('disk',7);
img2=imdilate(img1,se);
[lab,num]=bwlabel(img2);
figure(1)
for i=1:num
[r,c]=find(lab==i);
img4=img(:,min(c):max(c));
subplot(4,4,i)
imshow(img4)
end
