How do I create an array of image in matlab

Question

I read one by one images from a directory and I wish to create an array of images with that to pass to my mexFunction that processes these images. What I am tried so far is not working. Let say I have 100 images 256x256 when I do

 directory = uigetdir; fileList = dir(directory); imageVolume= [];

for idx = 3:numel(fileList)

     tempImage = imread(fullfile(directory, fileList(idx).name));
    imageVolume= [imageVolume tempImage]; 
 end

Whenever I do that, I don't get an array of 256x256xn, instead I just get an image of 256x(256*n), which is not what I want. Any idea?

Answer 1

Use Cell Arrays. Assuming the rest of your code is right:

for idx = 3:numel(fileList)
     tempImage{idx} = imread(fullfile(directory, fileList(idx).name));
end

Answer 2

Using cell arrays as @bjornsen suggested works. If you would rather not use cell arrays, you can use 3 dimensional matrices:

imageVolume(:,:,idx) = tempImage;

You must be sure, though, that all images are the same size. Otherwise, you're better off using cell arrays.