fn = \'1.jpg\';
p = imread(fn);
imshow(p);
[m,n,p] = size(p);
hold on
M = 10;  % 水平分量
N = 10;  % 垂直分量
lw = 0.1;  % 划线宽度
mx= ones(1,M+1);
my = linspace(1,m,M+1);
% 画水平线
for k = 1:M+1
    line([mx(k) n*mx(k)],[my(k) my(k)],\'color\',\'g\',\'LineWidth\',lw);
end
nx = linspace(1,n,N+1);
ny = ones(1,N+1);
% 画垂直线
for k = 1:N+1
    line([nx(k) nx(k)],[ny(k) m*ny(k)],\'color\',\'g\',\'LineWidth\',lw);
end