How to plot lines on image ?

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voxey
voxey 2019-12-26
评论： voxey 2020-1-3
How to plot lines on image ?

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Selva Karna
Selva Karna 2019-12-26
grid on;
ax = gca
ax.XColor = 'r';
ax.YColor = 'r';
ax.GridAlpha = 0.9;
% ax.GridColor = [0.1, 0.7, 0.2];
ax.GridColor = [0.9, 0, 0];
yticks(0:0.25:4)
xticks(0:0.125:8)
ax.GridColor = [0.9, 0, 0];
set(gcf, 'PaperUnits', 'inches');
set(gcf, 'PaperPosition', [0 0 10 10]);
saveas(gcf,'sk.png')

更多回答（1 个）

Image Analyst
Image Analyst 2019-12-26
The other answer will put a periodic grid over the image. If you want arbitrary lines from (x1,y1) to (x2, y2), you can use plot() or line().
hold on; % Make sure plot() does not blow away the image.
line(x, y, 'Color', 'r'); % OR....
plot(x, y, 'r-');
Yet another option is to place a line plot (like your question's tag) over the image. For that, see the attached m-file.
00_Screenshot.png
From your question, it is not clear what kind of lines you want.

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