Unable to image files automatically with different file names

Hi,

I have a GUi where I want to save the images from the 2nd image axes(handles.axes2) and generate file names automatically. Please find my code below:

function pushbutton1_Callback(hObject, eventdata, handles)
myFolder = 'D:\regionGrowing_MLT';
% Check to make sure that folder actually exists.  Warn user if it doesn't.
if ~isfolder(myFolder)
    errorMessage = sprintf('Error: The following folder does not exist:\n%s\nPlease specify a new folder.', myFolder);
    uiwait(warndlg(errorMessage));
    myFolder = uigetdir(); % Ask for a new one.
    if myFolder == 0
         % User clicked Cancel
         return;
    end
end
% Get a list of all files in the folder with the desired file name pattern.
filePattern = fullfile(myFolder, '*.jpg'); % Change to whatever pattern you need.
theFiles = dir(filePattern);
num_files=length(theFiles);
imgs=cell(1,num_files);
handles.num_files=num_files;
handles.myFolder=myFolder;
handles.filePattern=filePattern;
handles.theFiles=theFiles;
handles.InputImage = {};

for k = 1 : length(theFiles)
    baseFileName = theFiles(k).name;
    fullFileName = fullfile(theFiles(k).folder, baseFileName);
    fprintf(1, 'Now reading %s\n', fullFileName);
    % Now do whatever you want with this file name,
    % such as reading it in as an image array with imread()
    imageArray = imread(fullFileName);
    imshow(imageArray,'parent',handles.axes1);  % Display image.
    drawnow; % Force display to update immediately.
    
    InputImage=imageArray;
    
   
%     axes(handles.axes1);
   handles.num_files=num_files;
    handles.theFiles=theFiles;
   handles.InputImage{end+1}= InputImage;
    setappdata(handles.pushbutton1,'img',handles.InputImage);

guidata(hObject, handles);
end
end
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)
InputImage=handles.InputImage;
theFiles = handles.theFiles;
J=InputImage;
handles.seg={};
% J = getappdata(handles.pushbutton1,'img');
for i = 1:length(theFiles)
    
try
    J{i}=rgb2gray(J{i});
end
x=300; y=340;
a=imgaussfilt(J{i},2);
b=adapthisteq(a);
m=regiongrowing_MLT(b,x,y,12);
m=imfill(m,'holes');
% figure,imshow(m)
bw=imbinarize(m);
bw=bwareafilt(bw,1);
% figure,imshow(bw)
I = imresize(m,.5);  %-- make image smaller 
m1 = imresize(bw,.5);  %     for fast computation
% subplot(2,2,1); imshow(I); title('Input Image');
% subplot(2,2,2); imshow(m1); title('Initialization');
% subplot(2,2,3); title('Segmentation');
seg = region_seg(I, m1, 30); %-- Run segmentation
imshow(seg,'parent',handles.axes2);
%     axes(handles.axes2);
    handles.seg{end+1}=seg;
    setappdata(handles.pushbutton2,'img',handles.seg);
end
 filename = fullfile(myFolder, sprintf('file%d.jpg',seg));
 imwrite(InputImage, filename);
guidata(hObject, handles);
end

I want the results to be saved as file1.jpg,file2.jpg,file3.jpg, etc. Unfortunately, I get the following errors.

D:\regionGrowing_MLT\file0.jpgfile0.jpgfile0.jpgfile0.jpgfile0,...

for writing. You might not have write permission.

Error in ngui>pushbutton2_Callback (line 167)

imwrite(seg, filename);

I have attached few imput images. Any suggestions would be appreciated.

Answer 1

[Geoff Hayes]

Warid - the code error message

Error in ngui>pushbutton2_Callback (line 167)
imwrite(seg, filename);

does not correspond exactly to a line of code in your pushbutton2_Callback. The closest I could see was

imwrite(InputImage, filename);

Note that filename is set as

filename = fullfile(myFolder, sprintf('file%d.jpg',seg));

but nowhere in the function do you define what myFolder is. Perhaps you need to be using handles.myFolder.

[Warid Islam]

Hi Geoff,

I am sorry that I have written the wrong line of code above. It should be imwrite(seg, filename);

However, the error message is the same as mentioned above.

[Geoff Hayes]

Hi Warid - but is myFolder set in your callback function? Have you tried using handles.myFolder?

[Warid Islam]

Hi @Geoff Hayes,

Using handles.myFolder solved the problem for me. Thank you for your suggestion.