How to vectorize a sequence of 2D images using matlab?

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Yamini Nibhanupudi
Yamini Nibhanupudi 2018-4-10
回答： Dimitris Iliou 2018-4-10
I am trying to vectorize a large set of 100x100 images into 10000x1 column vectors. But I realised something is wrong with my code. I was wondering if anyone could provide me with the code to vectorize 2D images?
This is the code I used for matlab:
Pics = dir([source,'*.jpg']); %where the source contains my path that holds the jpg images
for i=1:length(Pics)
Im = imread([source,Pics(n).name]); Vectorized_Pic(:,:,1) = double(reshape(image(:,:,1),10000,1)); % if an image has 3 planes Vectorized_Pic= double(reshape(image,10000,1)); %if it is a 2D image
end

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回答（1 个）

Dimitris Iliou
Dimitris Iliou 2018-4-10
In order for this code to work, you will need to correct some of the variables you are using.
Firstly, in Pics(n), what is n? Do you mean Pics(i)?
Im = imread([source,Pics(n).name]);
Also, what is image in the following case? Should that be Im?
Vectorized_Pic(:,:,1) = double(reshape(image(:,:,1),10000,1));
Vectorized_Pic= double(reshape(image,10000,1));
In addition, Vectorized_Pic should be a vector that you iterate through.
Vectorized_Pic(i,:) = double(reshape(Im(:,:,1),10000,1));
Vectorized_Pic(i,:) = double(reshape(Im,10000,1));
and you should also check the number of planes you have using size.
Finally, instead of loading images with:
Pics = dir([source,'*.jpg']);
you should consider using imageDatastore. You can find more information on how to use it in:
https://www.mathworks.com/help/matlab/ref/matlab.io.datastore.imagedatastore.html

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