Get handles from GUI img

Hi,

I'm kind of new with GUI use in Matlab. I was working on a little script to find pixel under certains condition in a RGB image for a colleague, and I elect to go with a GUI.

So, first i build my GUI

fig = figure('units', 'pixels', ...         
    'position', [100 100 762 550], ...      
    'color',[0.9 0.9 0.9],...            
    'numbertitle','off',...                 
    'menubar','none',...                    
    'toolbar','figure',...                  
    'name', 'Pixdef',... 
    'tag', 'Interface');
movegui(fig,'center');
.... % creation of button, editbox, etc
axes1 = axes('parent', fig,...
             'units','normalized',...
             'position',[0.09 0.14 0.82 0.82] ,... 
             'tag','img');

handles = guihandles(fig);
guidata(fig,handles)

Then, I proceed to put button, edit box, axes to plot my image and thing like that in this figure, and notably :

• A button to open a RGB image from a file and show it in the figure.
• A button to run some calcuation to detect pixel I want.

These button callback 2 different functions :

function openImg(obj,~)
h = get(obj,'parent');
handles = guidata(h);

[file, path] = uigetfile(cd,'Image choice','*.png;*.bmp;*.tiff;*.jpg');
imgRGB = imread(fullfile(path,file));

imgplot = imshow(imgRGB,'parent',axes1);

end

This one, to plot the image i want to analyse in my figure. It works as i want.

And the second one, where I run the calucation, which needs the handles of "imgRGB".

Thing is, I currnetly don't manage to get the data from imgRGB.

I'm pretty sure it's something simple and that it's because i'm rushing something i don't mastered (GUI in Matlab) but if someone could explain me how I can do, it would help me a lot !

Thanks,

Imra'

Answer 1

[Adam]

Add

handles.imgRGB = imgRGB
guidata(h, handles)

in your above function, then if you get handles in your other function you can just access handles.imgRGB

[Imra]

Hi !

Thank you for that quick answers,

So currently i have this at the beggining of the "calculation" function,

h = get(obj,'parent');
handles = guidata(h);

It seems it doesn't get the "imgRGB" handles, i guess it might not be how i should get my handles?

[Adam]

You should just be able to use

handles = guidata( obj )

assuminig obj is the first argument of your callback.

But if you haven't added the lines above to attach imgRGB to your handles and then write the handles back to the GUI it won't be there.

[Imra]

Hey,

It seems I just didn't manage my handles correctly, I did some weird thing with how my function was built.

It is corrected now and it works fine. Thank you !