MATLAB: MATLAB background imshow image.

axesbackground imagezoom

I use an axis for preview the background image in background, i use an another to preview the image in a little box, but when i click "show image" the image rewrite my background image.

Sorry for my bad english, Regards, Hunor

Here is a code: function pushbutton10_Callback(hObject, eventdata, handles) axes(handles.axes1); global kep; global a; imshow(kep);

        function axes3_CreateFcn(hObject, eventdata, handles)
        backgroundImage = importdata('hatter.jpg');
        image(backgroundImage);
        axis off;

Best Answer

I have tested the following code and it works. Add it to your own.

% In the pushbutton3 callback
handles.output = hObject;
backgroundImage = importdata('background.jpg'); 
imshow(backgroundImage, 'Parent',handles.axesBackground);
axis off;
axis image;
guidata(hObject, handles);
% In the pushbutton5 callback
handles.output = hObject;
littleBoxImage = importdata('image.jpg'); 
imshow(littleBoxImage, 'Parent',handles.axesLittleBox); 
axis off;
axis image;
guidata(hObject, handles);

Defining the "parent" property allows you to choose in which axes you will display the image. I had used the axes(handles.myAxes) for plotting, not for image display, so I suppose that was the problem.

This should (finally!) work. Give it a try ;-) .

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Diana - the problem may be with this line of code

imbright=(handles.axes1)+val;

Note that you are adding a value val (calculated based on your slider position to the axes handle and not to the image. I think that what you want to do is save the image (that you have read from file) and then adjust it whenever the slider changes. Your pushbutton1 callback would become somethign like

function pushbutton1_Callback(hObject, ~, 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';'*.bmp'},'File Selector');
fullname=[pathname, filename];
ImageFile=imread(fullname);
axes(handles.axes1)
imagesc(ImageFile);
axis off;
handles.image = ImageFile;  % <--- new line to save the image to the handles object
guidata(hObject, handles);  % <--- new line to save the updated handles objet

Your slider callback would then look something like

function slider1_Callback(hObject, ~, handles)
% hObject    handle to slider1 (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    structure with handles and user data (see GUIDATA)
% Hints: get(hObject,'Value') returns position of slider
%        get(hObject,'Min') and get(hObject,'Max') to determine range of slider
if isfield(handles, 'image')
    val=0.5*get(hObject, 'value')-0.5;
    imbright=double(handles.image)+val;               % <--- new line, note the cast to double
    imshow(uint8(imbright), 'Parent', handles.axes1); % <--- new line, note the cast to uint8
end

Note the casting of the image to double before we add the val, and then the cast back to uint8 before we show it on the axes. One or both may not be necessary depending upon the original data type of the image.

Best Answer

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