What about MotionCV and MotionHV, I am not sure. One has to inspect their
code. I know, MotionCV has an extra parameters pair, Rotation block size,
which does not exist in the Motion plugin. It would be easy to implement it,
but I am unsure, whether the distinct rotation match block is really needed.
Perhaps I can say later more concretely about the difference, or may be GG
remembers.