Apparatus and process for encoding / decoding subtitles and subtitle data for use in a video image transmission and display system and recording support for subtitle data

摘要

A subtitle data encoding apparatus, which is used in a video image transmission system, creates loading blocks (70) from relative position information by sampling an input bit stream at a frame interval. The loading block corresponds to a pixel data block and contains changeover position information which updates a change position, delays the update operation and sets the length of the delay. The address used to access a color lookup table (71) for displaying subtitle data is changeable at the change position to access different display data stored therein. The pixel data block is encoded from subtitle data and the loading blocks and pixel data blocks are combined for transmission. The changeover position information can also be used to progress a color-wipe operation. IMAGE