Help to subtract two images with gui
Asked by Sophie on 31 May 2012
Latest activity Commented on by Image Analyst on 31 May 2012
Hello. I need help with gui. 1) I have 2 pictures that I want to subtract and do not know how to code. The two images are open in two axes. The subtract will appear in a third axes. 2)have to move from string to double?
thank you very much!
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2 Answers
Answer by Image Analyst on 31 May 2012
String to double??? No. Just cast to floating point (so you won't get clipping at 0) and subtract:
diffImage = double(image1) - double(image2);
Of course you already have image1 and image2 or else you wouldn't have been able to display them in their axes.
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Answer by Sophie on 31 May 2012
I have this:
% --- Executes on button press in psr. psr_Callback function (hObject, eventdata, handles) diffImage = double (img0) - double (img90); axes (handles.ps1) image (diffImage)
There is an error that says:
?? Undefined function or variable 'img0'.
Error in ==> entornografico2> psr_Callback at 233 diffImage = double (img0) - double (img90);
Error in ==> gui_mainfcn at 96 feval (varargin {:});
Error in ==> entornografico2 at 42 gui_mainfcn (gui_State, varargin {:});
Error in ==> @ (hObject, eventdata) gui1 ('psr_Callback', hObject, eventdata, guidata (hObject))
?? Error while uicontrol Callback Evaluating
Thank you.
1 Comment
Image Analyst on 31 May 2012
img0 is not in scope. You need to make it in scope - make it so that your callback can see it. See the FAQ: http://matlab.wikia.com/wiki/FAQ#How_can_I_share_data_between_callback_functions_in_my_GUI.28s.29.3F
Please post comments/follow-up questions as comments to my Answer, not as Answers to your questions.
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