APPARATUS AND METHOD FOR GENERATING ON-SCREEN- DISPLAY MESSAGES USING ONE- BIT PIXELS

摘要

AN APPARATUS AND CONCOMITANT METHOD FOR GENERATING AN OSD MESSAGE BY CONSTRUCTING AN OSD BITSTREAM (200) HAVING A PLURALITY OF "ONE-BIT" PIXELS. THE OSD BITSTREAM CONTAINS AN OSD HEADER (210) AND OSD DATA (220). AN OSD UNIT (100) RETRIEVES PIXEL CONTROL INFORMATION FROM THE OSD HEADER WHICH IS PROGRAMMED BY A PROCESSOR (130) OF A DECODING/DISPLAYING SYSTEM. THE OSD HEADER CONTAINS INFORMATION THAT IS USED TO PROGRAM A COLOR PALETTE OF THE OSD UNIT (150) AND TO PROVIDE INSTRUCTION AS TO THE TREATMENT OF THE OSD DATA. IF THE "COMPRESSED PIXEL MODE" IS ENABLE IN THE OSD HEADER, THEN THE OSD UNIT WILL TREAT EACH BIT OF THE OSD DATA AS A "ONE-BIT" PIXEL.