help required urgently about this error "REFERENCE TO NON EXISTENT FIELD"

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Rao
Rao 2012-6-19
im currently working on this thing which converts an rgb image to indexed when i press pushbutton 2 and then it will convert the map to ycbcr when i'll press pushbutton 3 but when i press pushbutton 3 it gives an error "106 inmap = handles.indmap; ??? Reference to non-existent field 'indmap'."
code is this :
% --- Executes on button press in pushbutton2.
function pushbutton2_Callback(hObject, eventdata, handles) % hObject handle to pushbutton2 (see GCBO) % eventdata reserved - to be defined in a future version of MATLAB % handles structure with handles and user data (see GUIDATA)
rgb=imread('C:\Users\Rao\Desktop\unused icons\backgrounds\birdie.png');
[handles.indexed,handles.indmap]=rgb2ind(rgb,8);
axes(handles.axes2);
imagesc(handles.indexed);
colormap(handles.indmap);
% --- Executes on button press in pushbutton3. function pushbutton3_Callback(hObject, eventdata, handles) % hObject handle to pushbutton3 (see GCBO) % eventdata reserved - to be defined in a future version of MATLAB % handles structure with handles and user data (see GUIDATA)
handles.ycbcrmap = rgb2ycbcr(handles.indmap);
axes(handles.axes3);
imagesc(handles.indexed);
colormap(handles.ycbcrmap);

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采纳的回答

Arthur
Arthur 2012-6-19
you have to save the handles structure at the end of the callback if you want to store something in there. At the end of pushbutton2_Callback add:
guidata(gcbo,handles)
(I'm not a big fan of storing your data in the handles structure, but that's a different discussion ;) ).
  2 个评论
Rao
Rao 2012-6-19
thanx pal it works :)
im having one more problem when i click the push button to convert the indexed image map to ycbcr and after i display the image using the new map i.e (ycbcr) , the image in axes2 i.e the image using rgb colormap also changes to and uses ycbcr now both images are same in axes 2 and 3 and when i press the pushbutton 2 the image in both axes 2 and 3 uses rgb colormap . i think it is related to handles.indexed image .. any suggestions please im stuck with this and i have to submit a report of this tomorrow.. :-(

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更多回答（1 个）

Arthur
Arthur 2012-6-19
This is probably due to using colormap without axes handle. try:
colormap(handles.axes3,handles.ycbrmap)
or see: doc colormap
  1 个评论
Rao
Rao 2012-6-19
this doesnt help :-( i keep getting same image in both axes when i click pushbutton 2 it display image with rgb colormap in both axes similarly when im pressing pushbutton 3 it displays image with ycbcr colormap in both axes.. :-|
maybe the image "handles.indexed" is global so the colormap is applying on it in both buttons

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