I want to make a double type matrix into an image

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ys 2022-4-15

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回答： DGM 2022-4-15

I have a matrix of [175,50,432] in a numerical matrix, but I want to make one image of [50,432]. What should I do?

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John D'Errico 2022-4-15

You can want to do all sorts of things. But only you have an idea what that means.

What would you do to form the (1,1) element of that image? You have 175 pieces of information. That is, 175 distinct pieces of information for EVERY pixel in the new image.

ys 2022-4-15

There are 175 numeric matrices with 50 vertical and 432 horizontal. I want to put it in the image input layer for classification by cnn, so I want to make 175 images with 50 vertical and 432 horizontal.

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Answer 1

DGM 2022-4-15

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Maybe this is a start.

A = rand(175,50,432); % some array
A = permute(A,[2 3 1]); % now it's oriented as specified
% do whatever you need to do with the pages of the image
for f = 1:size(A,3)
    R = mymagicalfunction(A(:,:,f));
end

Also note that many tools that handle images expect the data to be in a nominal range, which depends on the numeric class. For 'double', the data should be in [0 1]. If it's not, you'll have to decide how you want to scale it such that it is.