Is it a color image or a grayscale image? Do you want the lines burned into the image, or above it in the overlay?
[rows, columns, numberOfColorChannels] = size(yourImage);
spacing = 50; % Whatever.
for row = 1 : spacing : rows
line([1, columns], [row, row]);
end
for column = 1 : spacing : columns
line([column, column], [1, rows]);
end
If you want them in the overlay, simply use the line() function. If you want it burned into a grayscale image:
grayImage(:, columnNumber) = 255; % White = 255, can pick any intensity.
grayImage(rowNumber, :) = 255;
Same thing for color, just do it in whatever color channels you want. You can also control the color of the line that way.
