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how can I draw a grid over a specified region of the image

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ZhG
ZhG 2013-11-6
回答： Image Analyst 2013-11-6
For example, I have an image of 400*360. I want to draw small grids over a region of the image. E.g. draw small grids of 20*20 started from (50, 60) and until (300, 280). How can I do this?

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Image Analyst
Image Analyst 2013-11-6
You can do it in the overlay, with line(),
for row = 50 : 20 : 300
line([1, 360], [row, row];
end
for column = 60 : 20 : 280
line([column , column ], [1, 400];
end
or you can burn it into the image like this:
for row = 50 : 20 : 300
grayImage(row, :) = 255;
end
for column = 60 : 20 : 280
grayImage(:, column) = 255;
end

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