Raster segment commands are generated by a delta encoder and are encoded for raster segments detected to have moved in the current frame with respect to a location of the raster segment in a previous frame. Raster segment motion commands are stored in a queue and, when written, copy a raster segment...http://www.google.de/patents/US8121423?utm_source=gb-gplus-sharePatent US8121423 - Remote user interface raster segment motion detection and encoding
