Create a slider in GUI?
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Hi,
I'm experimenting with GUIDE and was wondering how to create a slider that allows the user to fix the threshold value from 0 - 255 of an image.
% --- Executes on slider movement.
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
global grayImage;
thresholdValue = uint8(get(handles.sldThreshold, 'Value'));
binaryImage= grayImage > thresholdValue;
axes(handles.axes2);
3 个评论
Walter Roberson
2015-12-6
what does get(handles.slider1, 'Max') return?
kelly123
2015-12-6
Varian Adisuryo
2016-7-28
same here. I have the same eror. what should I do?
采纳的回答
Image Analyst
2015-12-6
After the call to axes() in slider1_Callback, you need to call
imshow(binaryImage);
9 个评论
kelly123
2015-12-6
Image Analyst
2015-12-6
In GUIDE, you need to make the tag property of the slider "sldThreshold".
Or else (less preferred), change sldThreshold to slider1.
kelly123
2015-12-6
Image Analyst
2015-12-6
You don't have spaces around the dots, do you? So it's handles.axes2, not handles . axes2, right? And what do you expect to see happening? You're not doing anything with the binary image you create. Like I said originally, if you want to see the binary image you'll need to call
imshow(binaryImage);
Image Analyst
2015-12-6
What is the value of thresholdValue?
kelly123
2015-12-6
Image Analyst
2015-12-6
After you do this:
thresholdValue = uint8(get(handles.slider1, 'Value'));
put in these lines:
sliderValue = get(handles.slider1, 'Value')
message = sprintf('\nThe slider value = %f\nThe threshold value = %f', sliderValue , thresholdValue);
uiwait(helpdlg(message));
Varian Adisuryo
2016-7-28
I just did what you told, but when I run it the slider doesn't show and it become like this: Warning: slider control can not have a Value outside of Min/Max range Control will not be rendered until all of its parameter values are valid
what should I do? please help. I've been struggling with this slider for 3 days :(
Adam
2016-7-28
You can set the min, max and value all in a single set command if you want e.g.
set( handles.slider1, 'Min', 0, 'Max', 10, 'Value', 5 )
to make sure that the value is always within the min to max range and avoid getting that warning. The warning is pretty self-explanatory though from the point of view of knowing what is wrong.
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