MATLAB: Suppose there are two buttons in a GUI and from first button i browsed an image and now i want to use that image in the callback function of second button for further processing on that image with second button.??

matlab gui

how to use that please guide me because i am new to matlab

Best Answer

http://matlab.wikia.com/wiki/FAQ#How_can_I_share_data_between_callback_functions_in_my_GUI.28s.29.3F

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MATLAB: Using GUI, use one push button as an image browser and another to process the image that was chosen

Sean - image is the name of a built-in MATLAB function so it is not a good idea to name your variable image and so you should rename it to something else.

As for having your second callback be "aware" of the image that was chosen in the first callback, note the comment for the handles structure input

 % handles    structure with handles and user data (see GUIDATA)

You can update this structure with the image (user data) in the first callback so that any other callbacks that receive handles as an input will have access to it. Try something like

 function pushbutton1_Callback(hObject, eventdata, handles)
 [filename pathname] = uigetfile({'*.jpg';'*.bmp'},'File Selector');
 handles.myImage = strcat(pathname, filename);
 axes(handles.axes1);
 imshow(handles.myImage)
 set(handles.edit1,'string',filename);
 set(handles.edit2,'string',image);
 % save the updated handles object
 guidata(hObject,handles);

In your second callback, just reference the loaded image as handles.myImage as

 function pushbutton2_Callback(hObject, eventdata, handles)
 if isfield(handles,'myImage')
     % do stuff
 end

Try the above and see what happens!

MATLAB: Recall a figure in guide

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

Best Answer

Related Solutions

MATLAB: Using GUI, use one push button as an image browser and another to process the image that was chosen

MATLAB: Recall a figure in guide

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