Plot to Image?

2018 12 10
2 个回答
更新时间：2018 12 11
6 次查看（30 天）

0 个投票

Hi, I have a set of XY points that I plotted. Is there a way to convert this to an image? Basically I'm hoping to retain the resolution of the points while doing some image processing on it using the IPT.
Long story short, I have some encoders that have taken motion position numbers, and when I plot the XY encoder values I get the shape I expect, but I want to run it under regionprops and I have no idea how to turn the plot into an image with the same resolution so I can get accurate counts/mm. Currently 1 count = 1 pixel or 1 value on the plot.
Thanks

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回答（2 个）

Mark Sherstan
Mark Sherstan 2018-12-10

0 个投票

Would the following work for you or at least push you in the right direction?
x = 1:10;
y = x.^2;
xwidth = 300;
ywidth = 200;
figure (1)
h = figure(1);
set(gcf,'PaperPositionMode','auto')
set(h, 'Position', [0 0 xwidth ywidth])
plot(x,y)
saveas(gcf,'someFigure.png')

4 个评论
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Elmer Wang
Elmer Wang 2018-12-11
So this doesn't work becuase the image that's saved isn't 300 x 200. I need it to be exactly the same. otherwise the encoder counts are no longer accurate to estimate the lengths. It's close, but it still ends up at like 361x251 pxls. Thanks for your hlep.
Image Analyst
Image Analyst 2018-12-11
Upload screenshots of what you're seeing. Otherwise you're making us guess blind.
Mark Sherstan
Mark Sherstan 2018-12-11
Try this (solution was found here):
plot(1:10) % Example graph
set(gcf,'PaperUnits','inches','PaperPosition',[0 0 4 3])
print -djpeg filename.jpg -r100
Otherwise please provide more information such as example plots.
Elmer Wang
Elmer Wang 2018-12-11
I think I've found a workaround that doesn't use the IPT. Thank you for your help. I was trying to use IPT to match a second analysis method so that we had two data sets to compare parity between. But after talking to some of my colleagues, I don't believe that it's completely necessary.
Instead I'm just going to manipulate the data to get the information I need. Thank you again!

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R2018b

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Elmer Wang
Elmer Wang
2018-12-10

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Elmer Wang
Elmer Wang
2018-12-11

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