I'm trying to understand how video compression through dense optical flow works (I'm a newbie with video compression).
I easily understood what optical flow is, the thing I can't understand is why a simple video compression could not just send the parts of a frame marked with a "motion vector" (as you would send only the parts that have moved to or from a position from frame to frame).
I mean: MPEG is way more complex than that, what's the catch with sending parts of a frame that have changed to "stick them over it to get the next one"? Is this a technical flaw (i.e. too much data to be transferred) or is there something else involved that invalidates this simple reasoning?