how to add grid to the image?

I have a gray-scale image which is in .tif format. I opened it in MATLAB using imread command. Now i want to add grid as x and y axes in terms of its pixels. this image is of 1024*1024 pixels. Please help.

[Clay Swackhamer]

If you are still working on this I wrote a simple function to put a grid on an image. It is on the file exchange here

Answer 1

[Image Analyst]

You can overlay lines:

[rows, columns, numberOfColorChannels] = size(yourImage);
hold on;
lineSpacing = 20; % Whatever you want.
for row = 1 : stepSize : rows
    line([1, columns], [row, row], 'Color', 'r', 'LineWidth', 1);
end
for col = 1 : stepSize : columns
    line([col, col], [1, rows], 'Color', 'r', 'LineWidth', 1);
end

[KAE]

I think lineSpacing and stepSize are the same thing, i.e. the code will run if you substitute

stepSize = 20;

[Image Analyst]

Right. Thanks for the correction.

[Louise Wilson]

I found this very useful but it doesn't seem to save the lines onto the image? It just shows them in the figure within Matlab? Is that the case or is there a way I can save the lines on the image in a separate file? Just now I have...

for i = 1:fileCount2
    png=d2(i).name;
  
    image = imread(png);
    
    imshow(image);
    axis on;
    [rows, columns, numberOfColorChannels] = size(image);

    hold on; 
       stepSize = 20; % Whatever you want.
        for row = 1 : stepSize : rows
        line([1, columns], [row, row], 'Color', 'r', 'LineWidth', 1);
        end
        for col = 1 : stepSize : columns
        line([col, col], [1, rows], 'Color', 'r', 'LineWidth', 1);
        end
    
  
   for x=1:length(fileCount2)
   outputBaseFileName = sprintf('-%4.4d.png', x); %output filename, each frame numbered from 0001
   outputFullFileName = fullfile(strcat(outputFolder, '\FramesGrids'), strcat(baseFileName, outputBaseFileName)); %full output filename with .avi file number
   imwrite(image, outputFullFileName, 'png'); %write output png file
   end
         
end

...the grid is not saved in the new files however.

[Image Analyst]

Use the solution I gave in your other post: Code to burn a grid into an image

[Pablo Meseguer Esbri]

That was very helpful! Thank you!

[Image Analyst]

@Pablo Meseguer Esbri, thanks for the nice comment.

You can now use xline and yline instead of line to draw lines in the overlay. It will be simpler code. I'm pretty sure you don't even need to put hold on if you use xline and yline.

[rows, columns, numberOfColorChannels] = size(yourImage);
lineSpacing = 20; % Whatever you want.
for row = 1 : stepSize : rows
    yline(row, 'Color', 'r', 'LineWidth', 1);
end
for col = 1 : stepSize : columns
    xline(col, 'Color', 'r', 'LineWidth', 1);
end