Field or frame memories are often used in television receivers for video signal processing functions, such as noise reduction and/or flicker reduction. Television receivers also have graphic features such as teletext, menu-driven control systems, multilingual subtitling, an electronic TV-Guide, etc. A method of processing television picture signals including both video (VID) and graphic (GFX) information is disclosed. In accordance with the invention, the video and graphic signals are individually compressed in accordance with different (lossy and lossless, respectively) compression algorithms (22; 24), stored in the same field or frame memory (21), and decompressed (23; 25) after processing (20). Herewith a significant reduction of memory capacity is achieved without adversely affecting the graphics quality. The invention is not only applicable to locally generated graphic signals (TXT, OSD) but also to graphic information which is detected (26) as being embedded in a received television signal.
|Publication status||Published - 10 Dec 1998|