Get an image export with plot hold on

Question

Alejandro Fernández 2020-5-20

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/528353-get-an-image-export-with-plot-hold-on

评论： Alejandro Fernández 2020-5-22

Hi, I was wondering if anyone would know how to export an image that has had a hold on it and a Plot. I'll explain.

I have an image where I detect the contour and what I want to save is the original image where the points that are blue contours overlapping the original image are shown.

clear all; clc; close all
I = rgb2gray(imread('tumor_091R.tif'));
BW = edge(I,'Canny',100/255);
[r,c] = find(BW == 1);
figure
imshow(I)
hold on
plot(c,r,'.')
exportgraphics(gcf,'11.tif')

When I'm in Matlab and I zoom in on a certain area what I get is this:

But when I export it using the exportgraphics command what I get when I zoom in on the area I want to see is a spot of the type I show:

What I want to achieve is that the image I export allows me to zoom in as Matlab does, I tried the getframe option but the result was the same. Thanks in advance

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Answer 1

Ameer Hamza 2020-5-20

1
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/528353-get-an-image-export-with-plot-hold-on#answer_434813

编辑：Ameer Hamza 2020-5-20

在 MATLAB Online 中打开

If you want to zoom on the image, than you may try to save it in a vector format, e.g., eps file format. Try this

clear all; clc; close all
I = rgb2gray(imread('tumor_091R.tif'));
BW = edge(I,'Canny',100/255);
[r,c] = find(BW == 1);
fig = figure;
imshow(I)
hold on
plot(c,r,'.')
fig.Renderer = 'painters'; % render the points as vector
exportgraphics(gcf,'11.eps')

Alternatively, you can also use this excellent FEX package to save in high-res raster format: https://www.mathworks.com/matlabcentral/fileexchange/23629-export_fig

clear all; clc; close all
I = rgb2gray(imread('tumor_091R.tif'));
BW = edge(I,'Canny',100/255);
[r,c] = find(BW == 1);
fig = figure;
imshow(I)
hold on
plot(c,r,'.')
export_fig(gcf,'11.tif', '-r500'); % 500 is PPI of the image

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Ameer Hamza 2020-5-21

If possible, you may try to install R2018b and try to export eps in that version. I have already noticed that saving a complex graphic in vector format have greatly degraded after that version. That is why I keep an installation of R2018b just for this purpose. If this is extremely important, you may give it a try, although I am not sure that it will still work. It is just a guess.

Alejandro Fernández 2020-5-22