Reading data from figure

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Philipp Heinrich
Philipp Heinrich 2018-4-20
评论： Walter Roberson 2018-7-26
So guys I got the following problem:
I got a .fig 2D picture (actual picture based on data, not a simple 2D plot) with a colorbar from somebody else.
I want to write code that opens the picture and writes out all the data for me in a 2D Matrix.
I tried some of the Code that floats around the Internet, but nothing seemed to be working well for me.
Do you guys have any idea on how to do this ?
Edit: I attached an pcolor plot to show what it kinda looks like (I do not want to get in trouble for showing the real picture)
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Walter Roberson
Walter Roberson 2018-4-20
Which plotting routine was used to create the figure? image, surface, contour, mesh, patch,...

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Guillaume
Guillaume 2018-4-20

If you do have a pcolor plot, then your figure axis should contain a surface objet whose CData property should be the original data:

hfig = openfig(yourfigfile);
hsurf = findobj(hfig.Children, 'Type', 'surface');
originaldata = hsurf.CData;
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Nicholas1900
Nicholas1900 2018-7-26
hi, I have tried your code and changed 'surface'to 'image'. It doesn't work. The error message shows 'Attempt to reference field of non-structure array.
Error in data_extract_figure (line 10) hsurf = findobj(hfig.Children, 'Type', 'mesh');'
Walter Roberson
Walter Roberson 2018-7-26
Yiqing Meng: you appear to be using a MATLAB version that is R2014a or earlier.
You can use
hsurf = findobj(hfig, 'Type', 'surface');

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