how to take two images from real time image processing?

I'm working on a real time image processing... i wrote a code to take an image from the video and then used (pause(3)) function to wait for 3 seconds, and then repeat the first codes again to take anther image. But the second image comes same as the first one with no change. why it's not changing ? why the same image is coming again?

[CS Researcher]

You should share your code and some results. It will help everyone to understand your problem.

[Image Analyst]

Maybe you're not moving the camera or changing the scene or lighting. Maybe you call imshow() only once for the first image. Who knows? How can we know?

[haya yousuf]

this is the code for taking the second image:

pause(3)

while(vid.FramesAcquired<=200)

      data = getsnapshot(vid); 

      diff_im = imsubtract(data(:,:,1), rgb2gray(data)); 
      diff_im = medfilt2(diff_im, [3 3]);
      diff_im = im2bw(diff_im,0.18);

      diff_im = bwareaopen(diff_im,300);

      bw = bwlabel(diff_im, 8);

      stats = regionprops(bw, 'BoundingBox', 'Centroid');

      % Display the image
      imshow(data)

      hold on

      for object = 1:length(stats)
          bb = stats(object).BoundingBox;
          bc = stats(object).Centroid;
          rectangle('Position',bb,'EdgeColor','r','LineWidth',2)
          plot(bc(1),bc(2), '-m+')
          a=text(bc(1)+15,bc(2), strcat('X: ', num2str(round(bc(1))), '    Y: ', num2str(round(bc(2)))));
          set(a, 'FontName', 'Arial', 'FontWeight', 'bold', 'FontSize', 12, 'Color', 'yellow');
      end

      hold off

end
boxim=imcrop(data,bb);
figure(2)
imshow(boxim)

k=rgb2gray(boxim);
BW1 = edge(k,'sobel');%, 0.5);
imshow(BW1);
flushdata(vid);

Answer 1

[Image Analyst]

Get rid of imshow where you have it and put it after getsnapshot. Then call drawnow;

data = getsnapshot(vid); 
imshow(data);
drawnow;