Reading data from figure

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)

[Walter Roberson]

Which plotting routine was used to create the figure? image, surface, contour, mesh, patch,...

Answer 1

[Guillaume]

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;

[Philipp Heinrich]

Not sure if it is actually pcolor (at least your code did not work, because the hsurf only shows "0x0 GraphicsPlaceholder). Here is an image of what I am working with.

[Walter Roberson]

Try changing the 'surface' to 'image'

[Philipp Heinrich]

nice it works. thank you guys for helping me this fast. really appreciate it.

[Nicholas1900]

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]

Yiqing Meng: you appear to be using a MATLAB version that is R2014a or earlier.

You can use

hsurf = findobj(hfig, 'Type', 'surface');