How to resize a 3D image into a 4D matrix to use in montage function?

I have some images that I am trying to read in and display as one single image using montage.

At each for loop I read in a new image I and its edge-detected version E. I want to store each 3D array image(one dimension being color) into a cell array. I put the original images in the top row and the edge versions in the bottom row, with the intention that that is how I want them to be displayed in the final image.

In order to do this I have to resize all the images to make sure they are the same size.

However, I am running into errors with imresize. This is what I know so far:

• imresize only resizes the first two dimensions
• the montage function takes in a M-by-N-by-1-by-K array

So I believe the issue is that I can't resize it into a 4D array, but I need to in order to use montage. I considered using reshape but I don't think that will work since it doesn't permanently change the size.

Is there any way I can still use resize? Or are there other alternatives?

for i=1:num_imgs I = imread(directory); %read in the image as a 3d matrix E = edgesDetect(I,model);

    I = imresize(I,[600 800 1 3]); %resize into 600x800x1x3
    E = imresize(E, [600 800 1 3]);
    montageImage = cell(2,5); % create a cell with two rows, five columns

    for ii=1:num_imgs
        montageImage{1}{ii} = I;  %store original images in first row
        montageImage{2}{ii} =(1-E);
    end
end
montage(montageImage)

Note: If I try to simply resize it to be [600 800] without the extra dimensions, I get the following error in montage:

[bigImage, cmap] = images.internal.createMontage(Isrc, thumbnailSize,...