MATLAB: Load 4 images and display in 4 diff axes in GUI

axesguiguideImage Processing Toolboximagesload

Hi all,
i have created a button which will load images from the file. i needed to load 4 images and display them in 4 different axes in GUI. However, i have encountered some error in my final code.
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[MATLAB, folders] = uigetfile('*.*', 'MultiSelect', 'on')
filename1=strcat(folders,MATLAB(1))
filename2=strcat(folders,MATLAB(2))
filename3=strcat(folders,MATLAB(3))
image1=imread(filename1);
axes(handles.axes2)
imshow(image1)
handles.img=image1;
guidata(hObject, handles);
image2=imread(filename2);
axes(handles.axes3)
imshow(image2)
handles.img=image2;
guidata(hObject, handles);
image3=imread(filename3);
axes(handles.axes4)
imshow(image3)
handles.img=image3;
guidata(hObject, handles);
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Here's the error:
??? Conversion to logical from cell is not possible.
Error in ==> imread at 342 if (strfind(filename, '://'))
Error in ==> test2>pushbutton2_Callback at 100 image1=imread(filename1);
Error in ==> gui_mainfcn at 96 feval(varargin{:});
Error in ==> test2 at 42 gui_mainfcn(gui_State, varargin{:});
Error in ==> @(hObject,eventdata)test2('pushbutton2_Callback',hObject,eventdata,guidata(hObject))
??? Error while evaluating uicontrol Callback__
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PLS HELP!!
thanks!

Best Answer

  • "MATLAB" is a strange name for a file name. This is not an error, but confusing.
  • After importing several files, the output is a cell string. Then strcat(folders,MATLAB(1)) is a cell string also. But IMREAD requires a string. Solution:
filename1 = strcat(folders, MATLAB{1});  % curly(!) braces
  • When you want to import 4 images, using filename1 to filename3 misses one of them. Using a loop would be smarter. Suggestion:
[File, Folder] = uigetfile('*.*', 'MultiSelect', 'on');
handles.img = cell(1, length(File));
for iFile = 1:length(File)
  filename = strcat(Folder, File{iFile});
  image = imread(filename);
  axes(handles.axes(iFile));  % Better use a vector to store handles
  imshow(image);
  handles.img{iFile} = image;
end
guidata(hObject, handles);
Note: Using handles.axes(i) is more flexible than inserting the index in the name as in handles.axes1.
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