Figure gets displayed only after terminating the program. What to do?

im using subplots with imshow in my program which reads frames from a video file. Output figure is not getting displayed. If i terminate the program using Ctrl+C, the figure shows up. However instead of video file if I read input from webcam with videoinput, I get the output figure normally as usual. Code:

foregroundDetector = vision.ForegroundDetector('NumGaussians',3,'NumTrainingFrames',10,'LearningRate',0.000001); 
foregroundDetector1 = vision.ForegroundDetector('NumGaussians',3,'NumTrainingFrames',10,'LearningRate',0.000001); 
%vid = videoinput('winvideo', 1); %select input device 
vid = vision.VideoFileReader('daria_walk.avi');
i=1;

DlgH = figure;
H = uicontrol('Style', 'PushButton', ...
                    'String', 'Close', ...
                    'Callback', 'delete(gcbf)');

while (ishandle(H))
    frame = step(vid);
    %frame = getsnapshot(vid);  
    YCBCR = rgb2ycbcr(frame);
    rgbForeground = step(foregroundDetector, frame);
    ycbcrForeground = step(foregroundDetector1, YCBCR(:,:,3));

       se = strel('square', 3);   
      filteredForeground = imopen(rgbForeground, se);
      subplot(1,2,1);
      imshow(filteredForeground);
      title('RGB Foreground');
      subplot(1,2,2);
      imshow(ycbcrForeground);
      title('YCBCR Foreground');

end
close

Answer 1

[Jan]

Try to insert a drawnow command to instruct Matlab to update the display.

[Avinash S]

wow thanks! that worked