Frame Difference in gray scale 

1. I applied cvMean on original gray scale image and set as thresold 

So, result: http://imm.io/8x9p

2. then i get cvMean from the cvAbsDiff() ressult that set that mean value as
threshold 

result : http://imm.io/8x9H

And, When ever i apply this cvAbsDiff() it gave me moving edges but i meed
moving hand instead of moving edges.

My code : http://codepad.org/ZsaeWeB4

probably , I have no concept that how to get moving hand using cvAbsDiff() ..
:(

Every result in any color space give me moving edges .not moving hand .. .

http://imm.io/8xjf

This is the result after morphology operations for filling the interior of hand
. but in my point of view that is not possible . because morphology will only
apply where we have hand movement and hand movement only appears at edges in
form of shadow.

I do't understand how my friend said me that you have to fill the hand area ...


If i set rectangle on hand. then my rectangle on hand do't fit extacly because
during motion my edges breaked . so rectangle do't set directly on hand .

Please guide me that how can i get back my hand ??? 
ok well i did more dilate and erode 

http://imm.io/8xqx

almost near to get hand . may be need more dilate and erode

but  this is not good way to get hand . because more dilate and erode as a
result speed slow .

speed is too slow .Is there any other way to fill the interior of hand ?

Please  tell me that is there any  other way to get back my hand ?? 

Thanks