Error Concealment | JPEG | MPEG-4 | Wavelet | YUV

Hello every body
I am estimating the background in a video sequence with LMS algorithm, the speed of  estimating
is very slow,so I am thinking of using the block set, it means that instead of processing each
pixel individually I use a block of 2x2 ; the out put of each block is the mean(or median) of
pixels in that block .the speed is not bad,but it couldn’t estimate as well as that one, I
don’t know what shall I do, Any help is welcomed
do you have any new idea for blocking?
thanks

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