Convert imagesc back to matrix.

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Liam McRoe
Liam McRoe 2018-3-30
评论： Liam McRoe 2018-4-4
I have a figure generated by calling imagesc on a 1000x1000 matrix. I have the figure saved, but have lost the actual data used to generate it. Is there a way for me to recover the original matrix from this figure, without having to re-run the script used to generate the matrix. TIA.

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Rik
Rik 2018-3-30
Short answer: No.
Medium answer: Maybe, but with severely limited resolution in terms of pixels and data.
Long answer: That would depend on your needs. If the original resolution and precision is not an issue, you can crop the image part and use the colormap to convert the image back to indices (see rgb2ind). There is probably a much lower resolution in your image than the original data, and you are limited to the resolution of the colormap imagesc used and the precision of the file format it was saved to.
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Walter Roberson
Walter Roberson 2018-3-30
Sure, with the .fig it is easy.
imh = findobj(groot, 'type', 'image');
X = imh.XData;
Y = imh.YData;
ColorData = imh.CData;
The X and Y returned are probably going to be two-element scalars that give the locations of the centers of the lower-left and upper-right pixels.
The ColorData might perhaps be in RGB, but probably instead will be a 2D array of original unscaled data values -- the data you had asked to plot.
Liam McRoe
Liam McRoe 2018-4-4
Hi, sorry for the late reply. The suggestion by Walter has worked perfectly, thanks a lot to all for the help.

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