How do I add custom gridlines on my image?

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Hosup Song
Hosup Song 2017-1-21
评论： Clay Swackhamer 2018-10-17
So I'm trying to program an image converter and trying to get some gridlines on it.
axis equal;
imagesc(secondlevelTIFF, scale) %read matrix into figure
axis equal;
colormap(jet) %makes it into jet
axis on;
grid on;
colorbar;
temp=[[sprintf('fig%03d', i)],'.tif']; %name current figure file
fpath = [I have my path here]; %set file directory
saveas(gcf, fullfile(fpath, temp));
This is my current code with the 'secondlevelTIFF' being my image. I'm trying to add custom gridlines. The image file I have is 500*500 pixels and i want gridlines at 50 and 150 pixels. How do I add these gridlines so that they are on the top of my final image file?
  1 个评论
Clay Swackhamer
Clay Swackhamer 2018-10-17
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

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回答（2 个）

Image Analyst
Image Analyst 2017-1-21
编辑：Image Analyst 2017-1-21
Either burn the lines into your image like this:
[rows, columns, numberOfColorChannels] = size(secondlevelTIFF);
for row = 1 : 50 : rows
secondlevelTIFF(row, :) = 255;
end
for col = 1 : 50 : columns
secondlevelTIFF(:, col) = 255;
end
(this will change your image), or draw a line in the overlay above your image like this
hold on;
for row = 1 : 50 : rows
line([1, columns], [row, row], 'Color', 'r');
end
for col = 1 : 50 : columns
line([col, col], [1, rows], 'Color', 'r');
end
This will not make changes to the image array itself - it will just place lines into the graphic overlay. Adapt spacing and offset as needed.
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Hosup Song
Hosup Song 2017-1-21
I'm trying to use the second method here, but having a bit trouble understanding it. How do I actually implement this method?
Image Analyst
Image Analyst 2017-1-21
编辑：Image Analyst 2017-1-21
You implement it by coping and pasting that code I gave you into your code in the text editor window after you've displayed your image. It's very basic MATLAB skills. You have to learn how to write code into editor windows and how to debug them. If you already know how to do that, then I really don't understand your question at all. Here is a complete m-file for you:
secondlevelTIFF = imread('moon.tif');
imshow(secondlevelTIFF);
axis on;
[rows, columns, numberOfColorChannels] = size(secondlevelTIFF);
hold on;
for row = 1 : 50 : rows
line([1, columns], [row, row], 'Color', 'r');
end
for col = 1 : 50 : columns
line([col, col], [1, rows], 'Color', 'r');
end
And here is what it looks like:

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Star Strider
Star Strider 2017-1-21
You have to create a figure object, then put the gridlines on top of the image.
figure(1)
imagesc(secondlevelTIFF, scale) %read matrix into figure
set(gca, 'Layer','top')
... REST OF YOUR CODE ...
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Star Strider
Star Strider 2017-1-26
@Walter — Thank you.
I had to be away for a while. Life intrudes.
Image Analyst
Image Analyst 2017-1-26
Hosup, if you have R2016b you can run the new function xticks():
xticks([50,300]);
There is a similar function, yticks().

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