matlab 图像处理在图像上标记网格

假设现在讲一副图片分成10*10的网格，也就是将一副图像分成100等分的小块

图像img

首先需要找步长，也就是每个格子的边长为多少像素

[x,y] = size(img);    %找图像大小
grid_x = floor(x/10);   %将图像分成10*10的网格
grid_y = floor(y/10);
X = 1:grid_x:x;
Y = 1:grid_y:y;

步长找好了，就可以直接对相应的像素点进行操作，也就是在原图上标记网格

for i = 2:size(X,2)                           %%%%%%%%%%%%%%%%%%
for j = 1:y                                 %%%%%%%%%%%%%%%%%%
img(X(i),j)=~img(X(i),j);
%img(X(i),j) = 1;
end
end                                              %%%%%     画网格     %%%%%%%

for i = 2:size(Y,2)
for j = 1:x
img(j,Y(i))=~img(j,Y(i));
%img(X(i),j) = 1;             %%%%%%%%%%%%%%%%%%%%
end
end                                              %%%%%%%%%%%%%%%%%%%%%

figure,imshow(img)就可以了

特别的是，如果是三通道RGB图像，则需要将img改成双精度的

img=double(img); 即可

具体代码我放在这里