MATLAB: How to get binary data image with the save button on the guide

@citra

I am segmenting and saving images that have been segmented. The image was successfully saved with jpg type but I don't know how to save binary data from a segmented image.

is there a solution for this?

global frame
[name_file_save, path_save]=uiputfile ({'*.jpg','JPEG Image (*.jpg)';},'save citra');
if isequal(name_file_save,0) || isequal(path_save,0)
msgbox('Image is saved', 'Foto_Editor')
else
F=getframe(handles.axes2);
img=frame2im(F);
imwrite(img, fullfile(path_save,nama_file_save),'jpg');
end
axes(handles.axes2)

Best Answer

You don't need to use getframe(). That just saves a screenshot which will not even be the same size as the image you're hoping to save.

A segmented image is a binary / logical variable. You can save it with imwrite() if you cast to uint8. You might want to scale to 255 also.

% Make a uint8 image with values of 0 and 255 (so we can see it in the File Explorer thumbnail).
uint8Image = 255 * uint8(binaryImage); % binaryImage is your segmented image.
% Get base file name.  Discard any extension they may have entered, like jpg.
[f, baseFileNameNoExt, ext] = fileparts(name_file_save); 
% Construct full file name.
fullFileName = fullfile(path_save, [baseFileNameNoExt, '.png']); % NEVER use jpg for image analysis.  Use PNG.
% Now do the actual save of the segmented image to disk as a PNG format image.
imwrite(uint8Image, fullFileName);  % Save PNG image.

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Diana - the problem may be with this line of code

imbright=(handles.axes1)+val;

Note that you are adding a value val (calculated based on your slider position to the axes handle and not to the image. I think that what you want to do is save the image (that you have read from file) and then adjust it whenever the slider changes. Your pushbutton1 callback would become somethign like

function pushbutton1_Callback(hObject, ~, 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)

[filename pathname] = uigetfile({'*.jpg';'*.bmp'},'File Selector');
fullname=[pathname, filename];
ImageFile=imread(fullname);
axes(handles.axes1)
imagesc(ImageFile);
axis off;
handles.image = ImageFile;  % <--- new line to save the image to the handles object
guidata(hObject, handles);  % <--- new line to save the updated handles objet

Your slider callback would then look something like

function slider1_Callback(hObject, ~, handles)
% hObject    handle to slider1 (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    structure with handles and user data (see GUIDATA)
% Hints: get(hObject,'Value') returns position of slider
%        get(hObject,'Min') and get(hObject,'Max') to determine range of slider
if isfield(handles, 'image')
    val=0.5*get(hObject, 'value')-0.5;
    imbright=double(handles.image)+val;               % <--- new line, note the cast to double
    imshow(uint8(imbright), 'Parent', handles.axes1); % <--- new line, note the cast to uint8
end

Note the casting of the image to double before we add the val, and then the cast back to uint8 before we show it on the axes. One or both may not be necessary depending upon the original data type of the image.

MATLAB: How to change particular pixel color of a binary image to other color

Try this:

%grayImage = imread('cameraman.tif');
%binaryImage = grayImage > 128;
%subplot(1,2,1);
%imshow(binaryImage);
redAndBlueChannel = 255 * uint8(binaryImage);
greenChannel = 255 * ones(size(binaryImage), 'uint8'); % Green Everywhere.
rgbImage = cat(3, redAndBlueChannel, greenChannel, redAndBlueChannel);
%subplot(1,2,2);
%imshow(rgbImage);

Remove the % if you want to demo it using a standard MATLAB demo image.

Best Answer

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