how do I show the images name on top of each picture

Answer 1

[Yongjian Feng]

Add a title to each subplot, after you call subplot:

title('Horse')

[new_user]

subplot(2,2,3), title ('Bicycle');

imshow(readimage(imds,tricycle));

like this?

[Yongjian Feng]

Yeah, instead of ',', use ';'.

subplot(2,2,3);
title ('Bicycle');
imshow(readimage(imds,tricycle)); 

Answer 2

[Image Analyst]

Another option, other than title(), is to put the filename in text in the overlay

rgbImage = imread(filename);
imshow(rgbImage);
text(10, 10, filename, 'Color', 'r', 'FontSize', 20, 'VerticalAlignment', 'top');

[new_user]

figure

subplot(2,2,1)

imshow(readimage(imds,horse));

how to edit this line to add yours??

[Image Analyst]

I'm sure you figured it out by now, but it would go something like this:

fontSize = 20;
folder = pwd;
imds = imageDatastore(folder, "FileExtensions",[".jpg",".tif"])
numImages = length(imds.Files)
plotRows = ceil(sqrt(numImages))
for k = 1 : numImages
    thisFile = imds.Files{k}
    [f, baseFileName, ext] = fileparts(thisFile);
    thisImage = imread(thisFile);
    subplot(plotRows, plotRows, k);
    imshow(thisImage);
    title(baseFileName, 'FontSize', fontSize);
    text(10, 10, baseFileName, 'Color', 'r', ...
        'BackgroundColor', 'y', 'FontSize', fontSize, 'VerticalAlignment', 'top')
end
g = gcf;
g.WindowState = 'maximized'

I show the name both as a title and in the overlay.