Matlab imageset method order of read and name of image?

Question

%% Load images from folder

% Use imageSet to manage images stored in multiple folders
imset = imageSet('pet_images','recursive');
% Preallocate arrays with fixed size for prediction
imageSize = cnnModel.net.normalization.imageSize;
trainingImages = zeros([imageSize sum([imset(:).Count])],'single');

% Load and resize images for prediction
for ii = 1:numel(imset)
    for jj = 1:imset(ii).Count
        imshow(read(imset(ii),jj)); 
        trainingImages(:,:,:,jj) = imresize(single(read(imset(ii),jj)),imageSize(1:2));

    end
end

I want to read images from a directory. But it gives me error some images.

Assignment has fewer non-singleton rhs dimensions than non-singleton subscripts

• I use breakpoint to find which image has a problem. When it gives error, I catch the index of the image and show this image.

• I find this image from this directory. it's order is 1061 (orders according to name) but value of jj is 1012.

I have three Question.

1. Why it gives this error? (The resolution of (error) image : (263x380))
2. In order to find the image, I check with the image and same type cats. In for loop, Can I got the name of this image.?
3. While imageset read the directory, what according to read it (name,type,date, etc...)? Why the row number (1061) and index(1012) are mismatches?

Answer 1

1. if the image is grayscale, it gives error.
   Because rgb image is expected by trainingImages array.

2. getting the name of image, you can use code below;

   imshow(read(imset(ii),jj));
   a = select(imset(ii),jj);
   str = cellstr(a(1,1).ImageLocation);
   title(str);
   

3. Because imageset orders alphabetically but different way(name) For example.

   • Directory order : img1, img2, img3,... img9, img10, img11... img20, ...
   • imageSet read order: img1, img2, img3,... img9, img10, img20... img21, ...