How can I save my scalogram image?

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Reid Demass
Reid Demass 2022-3-16
评论： Rik 2022-3-21
I am creating a scalogram with:
img=cwt(signal);
I want to save the scalogram produced. I am looking just to save the image itself; no axes, title, key, etc.
I am trying:
exportgraphics(img,"cwt.png")
and receive errror:
Error using exportgraphics
First parameter must specify the axes or chart object.
Is img not the object I want since that is where I saved the cwt(signal)?

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Rik
Rik 2022-3-16
Since it clears the current figure (and then creates the object, the easiest way is to this:
img=cwt(signal);
exportgraphics(gca,"cwt.png");
  2 个评论
Reid Demass
Reid Demass 2022-3-16
Thank you, I was able to save the image. As a follow-up, is there a way to have only the scalogram saved? For example, I was able to save the image attached test2. However, I am only looking to retain what is in test3, which I manually cropped.
I have looked through example https://www.mathworks.com/help/deeplearning/ug/classify-time-series-using-wavelet-analysis-and-deep-learning.html?s_eid=PSM_25538&cid=%3Fs_eid%3DPSM_25538%26%01Classify+ECG+Signals+Using+Wavelet+Analysis+and+Deep+Learning in which scalograms are saved using a helper function, but it is not clear to me in the function code how they are removing the unwanted components of the image.
Rik
Rik 2022-3-21
Ran in:
load mtlb
cwt(mtlb,Fs)
h=get(gca,'Children');
h_im=findobj(h,'Type','Image');
figure,imshow(h_im.CData)
So, as you can see, you will have to rescale based on the XData and YData properties to view it properly. Then you will have to apply a colormap to convert it to a color image. (but this way you have the actual data instead of a screenshot)

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