Not enough input arguments error when using imshow

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Markus Kucera
Markus Kucera 2017-1-16
回答： ag 2025-4-13
Hi, since i havent found a solution to my problem i am asking you guys for your help. I have build a GUI with GUIDE. First the function was a script and it worked fine, since i changed it to a function i get the error. The reason i changed it is, that i also have a slider and want to update the threshold constantly and that didnt work out well with a script.
it works fine until i get to the "switch choice". Doesn't matter wich case i choose i always get the following error.
----------------------
Error while evaluating UIControl Callback
Error using Detection_plot (line 31)
Not enough input arguments.
Error in DetectionGUIv1>EdgeDet_Callback (line 116)
Detection_plot;
Error in gui_mainfcn (line 95) feval(varargin{:});
Error in DetectionGUIv1 (line 42) gui_mainfcn(gui_State, varargin{:});
Error in @(hObject,eventdata)DetectionGUIv1('EdgeDet_Callback',hObject,eventdata,guidata(hObject))
----------------------------------------------
NOTE: function EdgeDet_Callback and function Detection_plot are not in the same file
% --- Executes on button press in EdgeDet.
function EdgeDet_Callback(hObject, eventdata, handles)
% hObject handle to EdgeDet (see GCBO)
% eventdata reserved - to be defined in a future version of MATLAB
% handles structure with handles and user data (see GUIDATA)
axes(handles.axes1);
Detection_plot;
guidata(hObject, handles);
_____________________________
%%%Function to Callback%%%%%%
------------------------------
function Detection_plot (hObject, eventdata, handles)
%Read the saved Roughness image
RemoveWhiteSpace([], 'file', 'Roughness.png', 'output', 'Roughness1.png');
I=imread('Roughness1.png');
imshow(I, 'Border', 'tight')
%Selection of the needed Area in the image
choice = questdlg('Use the whole image or do you want to crop the image?', ...
'Image Area', ...
'Use full image', 'Use cropped image','Use cropped image');
switch choice
case 'Use full image'
I2 = imread('Roughness1.png');
imshow(I2,'Parent', handles.axes1);
case 'Use cropped image'
[I2, rect] = imcrop(I);
imshow(I2,'Parent', handles.axes1);
end
imshow(I2,'Parent', handles.axes1);
guidata(hObject, handles);
%convert image to black&white
I2 = rgb2gray(I2);
%Generate Gradient Image of BW-Image (lets see if that works better)
[Gx, Gy] = imgradientxy(I2);
[Gmag, Gdir] = imgradient(Gx, Gy);
%imshow(Gmag, []), title('Gradient Magnitude')
%Apply Edge Detection
SliderVal = get(handles.Tresh, 'Value');
BW = edge(Gmag,'Canny',SliderVal);
iptsetpref('ImshowBorder','tight');
%BW = imfill(BW, 'holes')
%imshow(BW);
end
So, i would be really happy if anyone of you could help me. Thank you

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回答（1 个）

ag
ag 2025-4-13
Hi Markus,
The error message "Error using Detection_plot (line 31): Not enough input arguments" indicates that the function "Detection_plot" is being called with fewer input arguments than expected.
Upon reviewing the code you provided, it appears that the function "EdgeDet_Callback" is calling "Detection_plot" without any input arguments. Below is a revised version of your code snippet that addresses this issue:
function EdgeDet_Callback(hObject, eventdata, handles)
%rest of the code
Detection_plot(hObject, eventdata, handles);
end
Hope this helps!

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