Is there any better way to do looping image snapshot with some algorithm in the loop?

I am now doing image processing project that requires looping image snapshot from my webcam. I am using 'getsnapshot' function to capture images and 'imshow' to view the looping image snapshots. The problem is 'imshow' UI did not view the looping images (video-like) but show one image only and my matlab was not responding. My program code was partially shown below:

>> for t=1:10000

image=getsnapshot(video);

imgHsv=rgb2hsv(image);

imgV=imgHsv(:,:,3);

imgVlim=imgV(240:480,315:325);

maxV=max(max(imgVlim));

[r,c]=find(imgVlim==maxV);

ctrRD=[(max(c)+min(c))/2 (max(r)+min(r))/2];

vpd=ctrRD(2)-ctrCam(2);

z=-24.8718+6750/vpd;

imshow(image);

end

What is the problem? is there any better way to do looping image snapshot with algorithm like this?