why video processing slows down over time?

I wrote a program to detect an object from a live video. For this background subtraction is used. Program runs in realtime for some time from start. Over time it is slowing down. The processing used is just some image arithmetic and morphological operations which run in 0.05 seconds, and this is done in video timer function. Timer period is 0.1 seconds. How can i solve the 'slowing down problem.

Answer 1

[Image Analyst]

Are you storing the images in an axes, like you're using image() or imshow()? Try inserting a "cla('reset')" just before and see if that speeds it up. Otherwise you may be loading all of the images in there instead of replacing them.

[Kurian Thomas]

Problem solved. Thank you very much. I used a 'hold on' after displaying image and forgot to 'hold off'. So i was loading all of the images to the same axes!!