yes，sir，may be use image label to get every block，such as
clc; clear all; close all;
[img,map] = imread('https://www.mathworks.com/matlabcentral/answers/uploaded_files/898115/image.png');
if ~isempty(map)
img = ind2rgb(img,map);
end
bw = im2bw(img,0.2);
bw2 = imclose(bw,strel('line',100,0));
bw2 = imclose(bw2,strel('line',50,90));
bw2 = imfill(bw2, 'holes');
bt = logical(bw2-bw);
[L,num] = bwlabel(bt);
% choose block
figure; imshow(img, []); hold on;
h = imshow(label2rgb(L));
set(h,'AlphaData',0.6)
