Im making a gui for motion detection program .This is where im finding difficulty.I want display the result in edit box of gui but im getting an error "Error while evaluating uicontrol Callback". Can anyone tell me how to solve it ? ?

Question

HRISHIKESH 2014-12-13

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/166502-im-making-a-gui-for-motion-detection-program-this-is-where-im-finding-difficulty-i-want-display-the

评论： HRISHIKESH 2014-12-13

采纳的回答： Image Analyst

function untitled13_OpeningFcn(hObject, eventdata, handles, varargin)

handles.output = hObject;

guidata(hObject, handles);

function varargout = untitled13_OutputFcn(hObject, eventdata, handles)

varargout{1} = handles.output;

function pushbutton1_Callback(hObject, eventdata, handles)

vid = videoinput('winvideo', '2','YUY2_640x480');

set(vid, 'ReturnedColorSpace', 'RGB');

start(vid)

preview(vid)

img = getsnapshot(vid);

pause(2)

img1 = getsnapshot(vid);

img12 = rgb2gray(img1);

img13 = rgb2gray(img);

dif =sum(sum(img12 - img13));

disp (dif)

set(handles.edit1,'string',num2str(dif));

function edit1_Callback(hObject, eventdata, handles)

function edit1_CreateFcn(hObject, eventdata, handles)

if ispc && isequal(get(hObject,'BackgroundColor'),

get(0,'defaultUicontrolBackgroundColor'))

set(hObject,'BackgroundColor','white');

end

when i run this i get an error Error while evaluating uicontrol Callback

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matt dash 2014-12-13

When you need help with an error, post the entire red error message, which explains where in your code the error occurs. This helps readers more easily identify what went wrong.

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Answer 1

Image Analyst 2014-12-13

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https://ww2.mathworks.cn/matlabcentral/answers/166502-im-making-a-gui-for-motion-detection-program-this-is-where-im-finding-difficulty-i-want-display-the#answer_162234

编辑：Image Analyst 2014-12-13

在 MATLAB Online 中打开

Well like Matt says, it's not clear because you didn't include the entire error message. But I can see some things wrong right off the bat. You're not subtracting correctly. The images need to be converted to double or you'll only find pixels where img12 is brighter than img13.

%dif =sum(sum(img12 - img13)); % NO!
%disp (dif) % Also No.  Don't print to the command line!
meanDifferenceImage = abs(double(img12) - double(img13));
meanDifference = mean(meanDifference(:))
str = sprintf('The mean difference = %.2f gray levels.', meanDifference);
set(handles.edit1,'string', str);

Also, read this please and fix your post's formatting.

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HRISHIKESH 2014-12-13

OMGGG .thanksss a lot man.it worked.Really appreciate this.Such a simple mistake and i spent around 6 hours trying to fix it. Again tahnks a looooot :)))))

HRISHIKESH 2014-12-13

Finalyy i can finish my project thanks to you :).This also solved another query of mine (that if i can dynamically update edit box).Seems i didnt have to do any thing special for it .Youre lifesaver :)

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