GUI - Saving image to pre specified folder

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Ellis Berry
Ellis Berry 2016-6-8
回答： Geoff Hayes 2016-6-8
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

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回答（1 个）

Geoff Hayes
Geoff Hayes 2016-6-8
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!

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