GUI slider error while using subplot

i want to use two sliders as max and min value of bwareaopen(img,[min max]) so whenever i dragg the first slider it just getting value one time not continually getting value so how i can get continous change in subplot by getting value of slider and update the subplot 2nd image ...code is below

function slider1_Callback(hObject, eventdata, 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\

newwimg=handles.image;
slideimg=imbinarize(newwimg);
min=get(hObject,'Value');
BW3=bwareafilt(slideimg,[min 500]);
axes(handles.axes1);
subplot(2,1,1)
imshow(handles.image);
title('Partially segmented')
subplot(2,1,2);
imshow(BW3);
title('Segmentation using slider')
guidata(hObject,handles)


% --- Executes during object creation, after setting all properties.
function slider1_CreateFcn(hObject, eventdata, handles)
% hObject    handle to slider1 (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    empty - handles not created until after all CreateFcns called

% Hint: slider controls usually have a light gray background.
if isequal(get(hObject,'BackgroundColor'), get(0,'defaultUicontrolBackgroundColor'))
    set(hObject,'BackgroundColor',[.9 .9 .9]);
end
% addlistener(hObject, 'ContinuousValueChange', @(hObject, eventdata) slider1_Callback(hObject, eventdata, handles));


% --- Executes on slider movement.
function slider2_Callback(hObject, eventdata, handles)
% hObject    handle to slider2 (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


% --- Executes during object creation, after setting all properties.
function slider2_CreateFcn(hObject, eventdata, handles)
% hObject    handle to slider2 (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    empty - handles not created until after all CreateFcns called

% Hint: slider controls usually have a light gray background.
if isequal(get(hObject,'BackgroundColor'), get(0,'defaultUicontrolBackgroundColor'))
    set(hObject,'BackgroundColor',[.9 .9 .9]);
end

[Rik]

This time I edited your question for you. Next time, please use the tools explained on this page to make your question more readable.

As for your question: you shouldn't using these functions in your callback, they are much too slow. Create the axes objects once, and after that only change the CData property. In your title you describe getting an error, but in your question body I see no indication of where an error might occur.

Also, the slider callback is only executed when you release the slider, or when you clikc the arrow buttons. If you want a live update during the draging, you should hack something together using the ButtonDownFcn or move your project over to App Designer. You shouldn't be using GUIDE anyway.

[Talha Meraj]

Rik can you help me with any example regarding ButtonDownFcn related to subplot?

[Rik]

I would really strongly advise you not to use that method. If live updates are important to you, switch to the App Designer.

But if you insist on re-inventing the wheel: you can use a mechanism similar to what I used in my WindowLevel FEX submission. If you don't see how you would do that, don't attempt to implement it, but use the uislider component of the App Designer (you can use the ValueChangingFcn to have a live update).

[Talha Meraj]

Thanks for your help....actually i am getting error by using

axes(handles.axes1);
  subplot(2,1,1)
  imshow(handles.image);
  title('Partially segmented')
  subplot(2,1,2);
  imshow(BW3);
  title('Segmentation using slider')
  guidata(hObject,handles)

how i can manage the subplot with axeshandle as i am using imshow() which i think causing error?

Answer 1

[Image Analyst]

Your slider2 callback function is empty. You need to put code in there. What I'd recommend is that each slider simply call a function called SliderMoved(handles) and have each callback call that. Then in there you can get the value of each slider and do something with your image.

function slider1_Callback(hObject, eventdata, handles)
    SliderMoved(handles)
end
function slider2_Callback(hObject, eventdata, handles)
    SliderMoved(handles)
end
function SliderMoved(handles)
    sliderValue1 = handles.slider1.Value;
    sliderValue2 = handles.slider2.Value;
    % etc. -- do something with these values.