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How do I overlap 2 images in matlab?

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jinwoo lee
jinwoo lee on 26 Jan 2021
Commented: jinwoo lee on 1 Feb 2021
Hi, all
There are two images of size M X N shown below.
In fact, my purpose was to create a topomap for the EEG signal, but it was difficult to use a known tool (e.g. EEGLAB), so I made it myself.
How do I make the black part in the right picture transparent and then overwrite the left picture? Or I would like to know how to show them at the same time.
The purpose is to make the following through two images.

Answers (1)

David Hill
David Hill on 26 Jan 2021
Assuming the pictures are rgb matrixes.
idx=ismember(picture2,[0 0 0],'rows');%find the black (I am assuming your image has no true black in the interior)
picture2(idx,:,:)=255;%change the black to white
picture2=reshape(picture2,size(picture1));%reshape to original matrix size
newPicture=min(picture1,picture2);%since picture1 is just black and white taking the minimum will produce the black of picture 1 overlayed on picture2
  1 Comment
jinwoo lee
jinwoo lee on 1 Feb 2021
Thanks for any help. My one is not an rgb matrix, so I solved it in a different way.

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