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O. Nemethova, M. Wrulich, M. Rupp:
"Processing of Game Video Sequences for Transmission over Mobile Networks";
Patent: International, No. WO/2007/045001; submitted: 10-21-2005, granted: 04-26-2007.

A method for preprocessing game video sequences comprising
frames and including a ball or puck as movable game object, for
transmission of the video sequences in compressed form, characterized
in that in an initial search frames are searched for the
game object on the basis of comparisons of the frames with
stored game object features, in that respective frames are compared
with preceding frames, to decide on the basis of differences
between consecutive frames whether a scene change has
occurred or not, wherein in the case of a scene change, an initial
search is started again, whereas in the case that no scene
change is detected, tracking of the game object is carried out
by determining the positions of the game object in respective
frames, in that at least for one frame, a dominant game playfield
color is detected and is replaced by a unitary replacement
color so that a playfield representation essentially consists of
points of the same color, and in that the presence, size and/or
shape of the detected game object is determined, to possibly replace
the game object by an enlarged replacement game object.