How to plot real time graph for images batch processing?

How to plot the variable handles.sum_erode versus frame number,k in the following programming?

The graph should be able to update parallel with the frame by frame processing.

% --- Executes on button press in pushbutton3.
function pushbutton3_Callback(hObject, eventdata, handles)
%button used to start the batch processing of the loaded video file------
% 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)
set (handles.pushbutton1 , 'enable' , 'off');
set (handles.pushbutton3 , 'enable' , 'off');

          for k = 1 :1: handles.numFrames
                  gambar = handles.vidFrames(:,:,:,k);
                  set(handles.text8,'String',k);
                  imshow(gambar, 'Parent', handles.axes3);
                  drawnow;
                  handles.image=gambar;
                  red=handles.image(:,:,1);
                  green=handles.image(:,:,2);
                  blue=handles.image(:,:,3);
                  B=rgb2gray(handles.image);%RGB image convert image to grayscale image

          %image processing(filtering and segmentation)
    .
    .
    .

  %using morphology
        se=strel('disk', 5);
        sel= strel('disk',1);
        SE = strel('square',2);
        clos_im=imclose(bw,se);
        erod_im=imerode(clos_im,sel);
        erod_im2=imerode(erod_im,SE); 
        imshow(erod_im2, 'Parent', handles.axes1);
        drawnow;
        figure,imshow(erod_im2) %show the processed image

  %to plot histogram frame by frame
        tgray= B.*uint8(erod_im2);
        t=tgray(tgray>0);
        ee=hist(t,0:255);
        axes(handles.axes2),bar(ee);
        drawnow;
        handles.sum_erode=sum(sum(erod_im));

  %coding to plot the real time graph but didn't workk!!         
  figure,hold on;
         plot(k,handles.sum_erode );
         drawnow;

          pause(0.5);

          end

Answer 1

[Image Analyst]

k is only a single number, not a vector with the same length as handles.sum_erode, so you need to make it into a vector. Try this:

plot(1:k, handles.sum_erode, 'b-', 'LineWidth', 2);
xlabel('k', 'FontSize', 14);
ylabel('sum_erode', 'FontSize', 14);
grid on;
drawnow;

[Syuhada Nurull]

Have run the code, but it plots many graphs, one for every k. I intend to plot only one graph that update itself.

Iv found some example in web but it use while loop for the graph plotting. If u see, my coding has already got a for loop , iv tried to put a while(k<handles.numFrames) loop for graph plotting inside the for k=1:1:handles.numFrames loop but it turn out the program keep looping only the while loop wthout stopping

[Image Analyst]

You must have "hold on" somehow. Put

hold off;
cla reset

right before the plot to clear out any prior plots.