clc; clear all; close all;

I = imread('E:\matlab\files-images\tomsen512.jpg');

rs = size(I, 1);% 行数

cs = size(I, 2); % 列数

% ch为列间隔 cw为行间隔 ，控制分块图像的大小，如现在的8*8

% numr为间隔块个数 numc为间隔块个数

ch = 8;   

cw = 8;

numr = round(rs/ch);

numc = round(cs/cw);

% 区域块分割

t1 = (0:numr-1)*ch + 1; t2 = (1:numr)*ch;

t3 = (0:numc-1)*cw + 1; t4 = (1:numc)*cw;

figure; imshow(I); hold on;

for i=1:numr

    for j=1:numc

        x=t1(i):t2(i);

        y=t3(j):t4(j);

        rectangle ('Position', [t3(j) t1(i) length(x) length(y)], ...,

            'EdgeColor', 'r', 'LineWidth', 1); %绘制矩形分割格子，红色

    end

end

效果如图，亲测可用（密集恐惧症慎点）：