MATLAB GUI IMAGE PROCESSING FROM LISTBOX

I have written a GUI which is using one listbox and two axes. When I click to pushbutton, I can see my folder list in listbox. And after in axes1, I can see images as preview. But I can not use this images for image processing. How can I select an image from listbox for image processeing? Sorry for my bad english.

function menuopenfolder_Callback(hObject, eventdata, handles)
% hObject    handle to menuopenfolder (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    structure with handles and user data (see GUIDATA)

handles.output = hObject;
fn = uigetdir(handles.cdir,'Select directory');
if fn ~= 0   
    handles.cdir = fn;    
    img = dir(fullfile(handles.cdir,'*.bmp'));
    for x = 1 : length(img)
        handles.I{x} = imread(fullfile(handles.cdir,img(x).name));
    end   
    if length(img) ~= 0, set(handles.listbox1,'enable','on');
    else,                             set(handles.listbox1,'enable','off'); 
    end
    set(handles.text5,'string',handles.cdir);
    set(handles.listbox1,'string',{img.name});    
end
guidata(hObject, handles);

--------------------------------

function listbox1_Callback(hObject, eventdata, handles)
% hObject    handle to listbox1 (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    structure with handles and user data (see GUIDATA)

% Hints: contents = cellstr(get(hObject,'String')) returns listbox1 contents as cell array
%        contents{get(hObject,'Value')} returns selected item from listbox1
handles.output = hObject;
index = get(handles.listbox1,'value');
axes(handles.axes1);
imshow(handles.I{index});
guidata(hObject, handles);

-------------------------------

 listbox1_CreateFcn(hObject, eventdata, handles)
  % hObject    handle to listbox1 (see GCBO)
  % eventdata  reserved - to be defined in a future version of MATLAB
  % handles    empty - handles not created until after all CreateFcns called

% Hint: listbox controls usually have a white background on Windows.
%       See ISPC and COMPUTER.

if ispc && isequal(get(hObject,'BackgroundColor'), get(0,'defaultUicontrolBackgroundColor'))
    set(hObject,'BackgroundColor','white');
end
return

%

Answer 1

[Image Analyst]

Get the 'string' property of the listbox to get a list of all the items in the listbox into a cell array. Then get the 'value' property and use it as an index to all the items list to give you the one(s) that are selected.

[MFK]

Can you help me more please? I couldn't handle with it. Can you give me an example?