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you can use cv::addWeighted to sum up the images. Assume that you have an empty image in which you want to store the images (dst) and read the video frames into a matrix src. your code could then look like:

cnt = 0; dst = EmptyImageSameSizeAsVideoSource while true: src = loadNewFrame() cv::addWeighted(dst,1,src,0.2,dst) # dst += 0.2*src cnt = cnt +1; if cnt%5 == 0: DoSomeMagic(dst) # dst is your mean image! dst.setTo(0)

you can use cv::addWeighted to sum up the images. Assume that you have an empty image in which you want to store the images (dst) and read the video frames into a matrix src. your code could then look like:like (just pseudo-Code):

 cnt = 0;
 dst = EmptyImageSameSizeAsVideoSource
EmptyImageSameSizeAsVideoSource() 
 while true:
    src = loadNewFrame()
loadNewFrameFromStream()
    cv::addWeighted(dst,1,src,0.2,dst) # dst += 0.2*src 
    cnt = cnt +1;
    if cnt%5 == 0:
       DoSomeMagic(dst) # dst is your mean image!
       dst.setTo(0)
dst.setTo(0)