How to load the images using the code approach

properties
    folder
    filename
end
% Call back for pushbutton to load image
[app.filename, app.folder] = uigetfile('*.*');
if ~ischar(app.filename); return; end   %user cancel
[~,~,ext] = fileparts(app.filename);
files = dir(fullfile(app.folder,['*' ext]));
% Update dropdown box with file names in the same folder with the same extension as file loaded.
app.ImageFileDropDown.Items = {files.name};
app.ImageFileDropDown.Value = app.filename;
% Read image
Img = imread(fullfile(app.folder,app.filename)); % or imread(fullfile(app.folder,app.ImageFileDropDown.Value))
imshow(app.UIAxes) % to load on axes
app.Image.ImageSource = fullfile(app.folder,app.filename) % to load on Image

2. If you plan on ploting or playing graphical objects ontop of image, I would use app.UIAxes.

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Othman Alkandri 2023-1-30

Thank you

Walter Roberson 2023-1-30

在 MATLAB Online 中打开

You can configure ItemsData to return particular values for a choice, so you can configure Items to be the list of things the user is shown, and ItemsData to be the corresponding filenames to use.

https://www.mathworks.com/help/matlab/ref/uidropdown.html

Img = imread(fullfile(app.folder,app.filename)); % or imread(fullfile(app.folder,app.ImageFileDropDown.Value))
imshow(app.UIAxes) % to load on axes

That should be

Img = imread(fullfile(app.folder,app.filename)); % or imread(fullfile(app.folder,app.ImageFileDropDown.Value))
imshow(app.UIAxes, Img) % to load on axes

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