recall a figure in guide

Question

maria 2016-9-9

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/302494-recall-a-figure-in-guide

回答： Geoff Hayes 2016-9-12

Hello! I am building an interface with GUI. By using a pushing bottom I open a figure, and by pushing a second one, I add a filter to the figure in another axes. However, Matlab gives me an error in the second function: the figure does not exits. How can I call the figure in the second function by pushing botoom 2? This is my code:

% --- Executes on button press in pushbutton1.
function pushbutton1_Callback(hObject, eventdata, handles)
% hObject    handle to pushbutton1 (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    structure with handles and user data (see GUIDATA)
[filename pathname]=uigetfile({'*.jpg'}, 'File Selector');
fullpathname=strcat(pathname, filename);
image=imread(fullpathname); 
figure.handle=imread(image);
set(handles.text2, 'String', pathname);
handles.axes1=imshow(image);
set(handles.axes1, imshow(image));
% --- Executes on button press in pushbutton2.
function pushbutton2_Callback(hObject, eventdata, handles)
filter=1-image;   
axes(handles.axes2);
imshow(filter);
set(handles.axes2, imshow(filter)

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Answer 1

Geoff Hayes 2016-9-12

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https://ww2.mathworks.cn/matlabcentral/answers/302494-recall-a-figure-in-guide#answer_234536

在 MATLAB Online 中打开

maria - if you want to reference the image that was loaded through the first push button, then save it to the handles object. For example,

 function pushbutton1_Callback(hObject, eventdata, handles)
 [filename pathname]=uigetfile({'*.jpg'}, 'File Selector');
 fullpathname=strcat(pathname, filename);
 handles.myImage=imread(fullpathname); 
 guidata(hObject,handles);
 % etc.

Note how the image is saved as

handles.myImage=imread(fullpathname);

and then save the updated handles object with

guidata(hObject,handles);

As an aside, do not create local variables named after built-in MATLAB functions like image. Also, it isn't clear to me what the intent is with

 figure.handle=imread(image);
 set(handles.text2, 'String', pathname);
 handles.axes1=imshow(image);
 set(handles.axes1, imshow(image));

What is figure.handle? Why are you overwriting handles.axes1 (which presumably is the axes in your GUI) with the handle returned by imshow?

Anyway, in the second push button callback you reference this image as

 function pushbutton2_Callback(hObject, eventdata, handles)
 if isfield(handles,'myImage')
     filter=1-handles.myImage;   
     axes(handles.axes2);
     imshow(filter);
 end