How to use roipoly command in app designer?

I have an image . I want to show this image app designer with using axes button .

and then use roipoly command to draw a region on that axes button in app designer.

how will I do that ? I couldn't manage it.

I have codes to add image and show it in app designer . With image button I am adding image.

But I can't use roipoly command in app designer. I want to use it when I click second button .

 properties (Access = private)
        t % Using this description
        end
% Callbacks that handle component events
    methods (Access = private)
        % Button pushed function: SelectAnImageButton
        function SelectAnImageButtonPushed(app, event)
           
            [filename pathname]= uigetfile({'*.jpg'},"Open file");
            fullpathname= strcat(pathname,filename);
            
            imgf=imread(fullpathname);
            if(size(imgf,3)>1)
            imgf=rgb2gray(imgf);
            end
           
            imshow(imgf,'parent',app.UIAxes);
            app.t=imgf % t is in here property function and it should be app.t
            
        end
        
%         Till here I am adding image and show it in app designer on UIaxes
        

        % And below codes I want to use roiploy command  I mean draw a region on app designer on UIAxes but it doesn't work 
        %  Button pushed function: SegmentImageButton
        function SegmentImageButtonPushed(app, event)
            
             mask=roipoly(app.t);       
            imshow(app.t,'parent',app.UIAxes);
        end
    end

Answer 1

[Monisha Nalluru]

Hi Ali,

From my understand, you want to display the mask of roi in the app designer.

roipoly command doesnot gives you the input parameter to target the UIAxes. So when ever you use roiploy command its open a new figure window and gives interactive tool select region of interest.

Once the roipoly command execution is done, close the figure window and use the output to display the in app designer.

% Button pushed function: ROIbuttonButton
        function ROIbuttonButtonPushed(app, event)
            roi = roipoly(app.Image);  % app.Image is image which is display through button press initally
            close(gcf); % close the roipoly provided figure window
            imshow(roi,'Parent',app.UIAxes); % display the mask of roi
        end

I am attaching a sample app for your reference using roiploy.

[Ali Zulfikaroglu]

Thank you for your answer. I did similar method when I didn't find anything.

But I wiil accept true your answer :)

Answer 2

[Ali Hamad]

As per documentation, roipoly function is not valid in app design. Please use drawcircle or drawrectangle to do the similar action.