Matlab - segmentacion de imagen

close all;

clear all;

clc;

A1 = rgb2gray(imread('imagenn.jpg'));

imshow(A1)

[f c] = size(A1);

umbral = 255;

for i = 1: f

    for j = 1 : c

        if j < c/2   % division verticcal

            if i < f/3

                IR(i,j) = A1(i,j);

            else

              IR(i,j) = 255 - A1(i,j);

            end

        else % division verticcal

             if i < f/2

                 IR(i,j) = 255 - A1(i,j);

            else

                 %if j < c/2     

                if A1(i,j)< umbral

                    IR(i,j)=150;

            else

              IR(i,j) = 150;

            end

            end

        end

        end

    end

%end

figure; imshow(IR);

dc=3; %cuantas columnas

df=7; %cuantas filas

A1=reshape(1:21*21, [21 21]); %aquí va tu imágen leída

[f, c] = size(A1);

v=linspace(0,c,3+1);

v(2,1:end+1)=[0 v+1];

v(:,1)=[];

v(:,end)=[];

v2=linspace(0,f,df+1);

v2(2,1:end+1)=[0 v2+1];

v2(:,1)=[];

v2(:,end)=[];

for k=1:dc

for l=1:df

A{l,k}=A1(v2(2,l):v2(1,l),v(2,k):v(1,k));

end

end