This invention provides a data processing apparatus and a data processing method for reducing the amount of image data denoting a pattern drawn on a whiteboard by a pen or the like being moved so as to designate locations in a designated sequence. Specifically, a coordinate transformation circuit transforms...http://www.google.de/patents/US7565614?utm_source=gb-gplus-sharePatent US7565614 - Image data processing apparatus and image data processing method for a video conference system
