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Saving Figure Data into a Matrix

Asked by Royi Avital on 4 Jul 2011
Latest activity Commented on by xinyue L on 14 Aug 2019
Hello.
I'm using 'image()' to display an image. I'm adding some annotations using text.
I'd like to save the final result as matrix (3 Channels of the displayed image width and height). Something like using: OI = get(imageHandler, 'CData'); Yet which includes all the annotations I added.
I know I can use 'saveas' and 'print' yet then the data undergoes some interpolation while I want the data as it is back as a matrix.
Anyone knows how to do it?
Thanks.

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Great question!

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2 Answers

Answer by Gerd
on 4 Jul 2011
 Accepted Answer

Hi Royi,
you can use the getframe command.
logo = imread('Logo.jpg','jpg');
image(logo);
text(20,30,'Hello')
f=getframe(gcf)
new=f.cdata
imwrite(new,'new.jpg','JPEG')
Gerd

  3 Comments

Hello Gerd.
Well, it's almost perfect.
Let's say I is a 250 by 250 pixels image.
I use 'image' to display it.
I add annotations on the image itself.
Using 'getframe' I get a matrix which is much bigger than 250 x 250.
I want to get back not the whole figure (As in 'saveas') but only the image itself with all the annotations.
Thanks.
xinyue L on 14 Aug 2019
I met the same question.Have you solved this problem? Looking forward to your answer.
xinyue L on 14 Aug 2019
I solved this problem just now.
You can try gca command.It returns the current figure or image.
Example:
Frame = getframe(gca);
FrameData = Frame.cdata;
imshow(FrameData)
imwrite(FrameData,'teat.png','PNG');

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Answer by Leslie Solorzano on 16 Dec 2016

https://se.mathworks.com/help/matlab/ref/frame2im.html

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