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image disappears when the button is not clicked

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tedy 2013-3-15

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Hello,

I make a simple GUI on matlab with the button, but the image only appears when i click on the button, and the image disappears when i don't click on the button, there is only black image as the background.

Please help me in out from this error. Thanks

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Walter Roberson 2013-3-15

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Please show the parts of your code that have to do with showing the image.

Image Analyst 2013-3-15

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What error? It seems like it's operating like it's supposed to. It starts with a black image window, then when you click a button you display the image. Isn't that what you wanted? What is the error message? http://www.mathworks.com/matlabcentral/answers/6200-tutorial-how-to-ask-a-question-on-answers-and-get-a-fast-answer

tedy 2013-3-15

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在 MATLAB Online 中打开

this is the parts of code

function test_Callback(hObject, eventdata, handles)
% hObject    handle to ekstraksiciri (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    structure with handles and user data (see GUIDATA)
crop=handles.crop;
axes(handles.axes1);
image=takepicture(crop);
axes(handles.axes2);
imshow(image);
handles.image=image;
guidata(hObject, handles);

first appearance http://i1338.photobucket.com/albums/o690/Tedy_Frank/image2_zps4efdcc87.jpg the result should be http://i1338.photobucket.com/albums/o690/Tedy_Frank/img_zps0e7f5593.jpg

the white line appears very quickly when it's clicked and then disappear again. it just like once click->once appears then disappear, so on. so,it just looked the black background only http://i1338.photobucket.com/albums/o690/Tedy_Frank/img2_zps80d6e87f.jpg

there is no error message, I am so confused

Walter Roberson 2013-3-15

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Using "image" as a variable name is going to cause you problems.

What white line? Your code does not have any lines.

Are your two axes overlapping ?

tedy 2013-3-15

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"takepicture" is a function that result the white line like that. there is no error with the function, i've checked out the function separately,and it works. so, i think there is no axes overlapping.

Walter Roberson 2013-3-15

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在 MATLAB Online 中打开

perhaps you want to add

drawnow()

after the takepicture() call.

tedy 2013-3-16

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it doesn't work. still the same

tedy 2013-3-16

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when i add drawnow(), the output give the overlapping image. when i click the button, it display a image and when i click again,it also display image that overlapping each other,so on.