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 ? ?

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

[matt dash]

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.

Answer 1

[Image Analyst]

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.

[HRISHIKESH]

*thanks for finding out the eroor in calculation of difference.I edited the program but still im getting the same error as before

Error in untitled13>pushbutton1_Callback (line 95) set(handles.edit1,'string', str);

Error in gui_mainfcn (line 96) feval(varargin{:});

Error in untitled13 (line 42) gui_mainfcn(gui_State, varargin{:});

Error in @(hObject,eventdata)untitled13('pushbutton1_Callback',hObject,eventdata,guidata(hObject))

Error while evaluating uicontrol Callback *

[Image Analyst]

Do you actually have an edit box with the tag of edit1? Attach your m-file and .fig file, and anything else needed to run your program. Use the paper clip icon.

[HRISHIKESH]

i have the edit box with tag edit1.I created the gui using guide.

[Image Analyst]

You have a "clear" in your pushbutton callback that blows away the handles structure. Get rid of that.

[HRISHIKESH]

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]

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 :)