How can I save lines in MATLAB as an image?

Question

Nora Hora 2016-12-9

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/316192-how-can-i-save-lines-in-matlab-as-an-image

回答： Image Analyst 2016-12-10

After I finished the transformation with my program I would like to export the images which contains different number of lines. I got error when I try to imwrite it as the following:

Error using imwrite (line 420)
Expected DATA to be one of these types:
numeric, logical
Instead its type was matlab.graphics.primitive.Line.

This is how they look like when I plot them. I only need the image of the scales, and the others are not required for me. (I also tried saveas but I couldn't remove the unnecessary parts.)

Any solution? Thank you in advance for your help!

1 个评论
显示 -1更早的评论隐藏 -1更早的评论

Image Analyst 2016-12-10

I'm not sure how Laslo's solution removed the lines and saved only the axes scales. I think it would save everything - scales and blue lines.

It seems to me you should plot the lines, getting the handles, then put hold on, then delete the handles. That would hopefully leave the axes as-is but not have the blue lines (which you do not want).

请先登录，再进行评论。

请先登录，再回答此问题。

Answer 1

Image Analyst 2016-12-10

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/316192-how-can-i-save-lines-in-matlab-as-an-image#answer_246699

在 MATLAB Online 中打开

Try this:

x = rand(1,10)*20
y = rand(1,10)*30
hLine = plot(x, y, 'b-');
% Save axes ranges.
yl = ylim();
xl = xlim()
grid on;
% Get rid of blue lines.
delete(hLine);
% Restore axes ranges from 0-1 to what they were during the blue lines.
xlim(xl);
ylim(yl);

Now you have an axes showing just the scales that were present while the blue lines were showing. No blue lines are showing. Now you can use export_fig(), hgsave(), print() or whatever to save the axes.