Displaying a set of images from a folder
3 views (last 30 days)
Show older comments
Filip Juchnicki
on 19 Sep 2021
Answered: Image Analyst
on 19 Sep 2021
Hello. I need to place a button in my app that displays all the images from a folder one after another with a time delay on a UIAxes and another button that opens a figure. I'm having problems with understanding the process behind opening files via code in matlab. Can anyone help me a bit in this matter?
0 Comments
Accepted Answer
Walter Roberson
on 19 Sep 2021
Edited: Walter Roberson
on 19 Sep 2021
projectdir = 'path/to/image/directory';
ext = '.png'; %adjust according to kind of images
dinfo = dir( fullfile( projectdir, "*"+ext) );
fullnames = fullfile({dinfo.folder}, {dinfo.name});
nfiles = length(fullnames);
ax = app.axes1; %place you want the image to be shown
h = image(ax, []); %create image object with empty content
for K = 1 : nfiles
thisfile = fullnames{K};
[thisimg, thismap] = imread(thisfile); %handles pseudocolor and rgb both
h.CData = thisimg; %update the existing image object with the new image
if ~isempty(thismap); colormap(ax, thismap); end %if needed, update colormap
pause(0.2);
end
The above code does not, however, account for true grayscale images. You would detect those as thismap being empty and ndims(thisimg) is 2 .
2 Comments
Walter Roberson
on 19 Sep 2021
ext is used in
dinfo = dir( fullfile( projectdir, "*"+ext) );
So for example from .png it would construct the string "*.png" and that becomes the pattern that dir() is to search for -- files with that extension.
More Answers (1)
See Also
Categories
Find more on Convert Image Type in Help Center and File Exchange
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!