GUI - Saving image to pre specified folder

Hi everybody,

On one pushbutton I have made some code that allows the user to select a folder of their choice to use as the folder in which processed images will be saved. Here is the code for the 'choose save location' button:

% --- Executes on button press in pushbutton3.    SAVE
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)
%Choose which folder processed pics will go in.
save_folder_name = uigetdir;

%Update handles with the outDir
handles.outDir = save_folder_name;
guidata(hObject,handles);

Now, when the processing is done on another pushbutton, I want to save the image each time the code loops to the folder specified in that last pushbutton. Is there a way I can use the imwrite function in a way such as 'imwrite(outDir)' or something like that? If I just use imwrite then it saves the images to my documents but not in the folder I chose in the other pushbutton. Any ideas?

Here is the code which runs the loop:

% --- Executes on button press in pushbutton1.   RUN
function pushbutton1_Callback(hObject, eventdata, handles)
% hObject    handle to pushbutton1 (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    structure with handles and user data (see GUIDATA)
 outDir = handles.outDir;

   inDir = handles.inDir;

   %Specify the folder where the files (Pictures) live. Chosen by pushbutton2
  myFolder=handles.inDir;
  %Get a list of all files in the folder with the desired file name pattern.
  filePattern=fullfile(inDir, '*.JPG');
  theFiles=dir(filePattern);
  caListBoxItems = cell(length(theFiles), 1);
  h=waitbar(0, 'Please Wait...');
  for k=1:length(theFiles)
      RGB = imread(fullfile(inDir, theFiles(k).name));
      perc = numel(theFiles);
  %     if k ==1
  %         axes(handles.axes1)
  %         [BW, xi, yi] = roipoly(RGB);
  %         xMin = min(xi);
  %         xMax = max(xi);
  %         yMin = min(yi);
  %         yMax = max(yi);
  %     end

       newRGB = imcrop(RGB,[handles.xMin handles.yMin handles.xMax-handles.xMin handles.yMax-handles.yMin]);

       % Convert RGB image to chosen color space
       I = rgb2hsv(newRGB);

       % Define thresholds for channel 1 based on histogram settings
       channel1Min = 0.053;
       channel1Max = 0.083;

       % Define thresholds for channel 2 based on histogram settings
       channel2Min = 0.116;
       channel2Max = 0.130;

       % Define thresholds for channel 3 based on histogram settings
       channel3Min = 0.608;
       channel3Max = 0.643;

       % Create mask based on chosen histogram thresholds
       BW = (I(:,:,1) >= channel1Min ) & (I(:,:,1) <= channel1Max) & ...
           (I(:,:,2) >= channel2Min ) & (I(:,:,2) <= channel2Max) & ...
           (I(:,:,3) >= channel3Min ) & (I(:,:,3) <= channel3Max);

       % Invert mask
       BW = ~BW;

       % Initialize output masked image based on input image.
       maskedRGBImage = RGB;

       % Set background pixels where BW is false to zero.
       maskedRGBImage(repmat(~BW,[1 1 3])) = 0;

       pathname = outDir;   %handles.outDir??

       imwrite(BW,[pathname, 'BW', num2str(k), '.jpg'], outDir);

       %Update waitbar with current image/total number of images to process:
       waitbar(k/perc, h);
       drawnow;

   end
   delete(h);

many thanks,

Ellis

Answer 1

[Geoff Hayes]

Ellis - since you are saving the output directory to handles.outDir then you will need to use this in your call to imwrite. For example,

 function pushbutton1_Callback(hObject, eventdata, handles)

 % your code

 for k=1:length(theFiles)

    % etc.

    % define the file name
    filename = sprintf('BW%d.jpg',k);

    % define the full path and filename
    fullFilename = fullfile(handles.outDir, filename);

    imwrite(BW, fullFilename);

 end

Try the above and see what happens!